Document:

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                                                                     Exhibit 4.1

                  CERTIFICATE OF DESIGNATION, NUMBER, POWERS,
                   PREFERENCES AND RELATIVE, PARTICIPATING,
                     OPTIONAL AND OTHER RIGHTS OF SERIES A
                          CONVERTIBLE PREFERRED STOCK
                                      OF
                                IFX CORPORATION

     IFX Corporation (the "Corporation"), a corporation organized and existing
under the General Corporation Law of the State of Delaware, hereby certifies
that, pursuant to the provisions of Section 151 of the General Corporation Law
of the State of Delaware, its Board of Directors, at a meeting duly held on June
12, 2000, adopted the following resolution:

     WHEREAS, the Board of Directors of the Corporation is authorized by the
Restated Certificate of Incorporation to issue up to 10,000,000 shares of
preferred stock in one or more series and, in connection with the creation of
any series, to fix by the resolutions providing for the issuance of shares the
powers, designations, preferences and relative, participating, optional or other
rights of the series and the qualifications, limitations or restrictions
thereof; and

     WHEREAS, it is the desire of the Board of Directors of the Corporation,
pursuant to such authority, to authorize and fix the terms and provisions of a
series of preferred stock, classes of such series of preferred stock and the
number of shares constituting such classes;

     NOW, THEREFORE, BE IT RESOLVED, that there is hereby authorized a series of
preferred stock on the terms and with the provisions herein set forth on Annex A
attached to this resolution.

                                             Name:/s/Joel Eidelstein
                                                  ------------------
                                             Title: Joel Eidelstin
                                                      President

ATTEST:/s/ Jose Leiman
       ---------------

Name: Jose Leiman
Title: Chief Financial Officer

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                                    ANNEX A

                     SERIES A CONVERTIBLE PREFERRED STOCK

     The powers, designations, preferences and relative, participating, optional
or other rights of the Series A Convertible Preferred Stock of IFX Corporation
(the "Corporation") are as follows:

     1.   DESIGNATION AND AMOUNT.

     This series of preferred stock shall be designated as "Series A Convertible
Preferred Stock" and shall be divided into two classes: Class I Series A
Preferred Stock ("Class I Preferred") and Class II Series A Preferred Stock
("Class II Preferred," and together with the Class I Preferred, the "Series A
Convertible Preferred Stock"). The Series A Convertible Preferred Stock shall
have $1.00 par value per share. The number of authorized shares constituting the
Class I Preferred shall be 1,210,398 shares. The number of authorized shares
constituting the Class II Preferred shall be 820,471 shares. Shares of the Class
I Preferred have a stated value of Twelve and 31/100 Dollars ($12.31) per share
and shares of the Class II Preferred shall have a stated value equal to the
Closing Per Share Price (as defined in the Preferred Stock Purchase Agreement
dated June 15, 2000 among the Company, UBS Capital Americas III, L.P. and UBS
Capital LLC (the "Preferred Stock Purchase Agreement")) (as applicable to the
Class I Preferred or the Class II Preferred, as the case may be, the "Stated
Value").

     2.   DIVIDENDS.

     (a)  Right to Receive Dividends. Holders of Series A Convertible Preferred
Stock shall be entitled to receive dividends when, as and if declared by the
Board of Directors of the Corporation (the "Board of Directors").

     (b)  Participation with Common Stock. In the event the Board of Directors
shall elect to pay or declare and set apart for payment any dividend on any
shares of common stock, par value $.02 per share, of the Corporation (the
"Common Stock") in cash out of funds legally available therefor or in stock or
other consideration, the holders of the Series A Convertible Preferred Stock
shall be entitled to receive, before any dividend shall be declared and paid or
set aside for the Common Stock, dividends payable in the form and in an amount
per share equal to the per share amount that would have been payable to such
holders had such holders converted their Series A Convertible Preferred Stock
into Common Stock pursuant to Section 5 below.

     (c)  Dividend Preference. Dividends on the Series A Convertible Preferred
Stock shall be payable before any dividends or distributions or other payments
shall be paid or set aside for payment upon the Common Stock or any other stock
ranking on liquidation or as to dividends or distributions junior to the Series
A Convertible Preferred Stock (any such stock, together with the Common Stock,
being referred to hereinafter as "Junior Stock"). If there shall be outstanding
shares of any class or series of capital stock which is entitled to share
ratably with the Series A Convertible Preferred Stock in the payment of
dividends or distributions or upon liquidation ("Parity Securities"), no full
dividends shall be declared or paid or set apart for payment on any such
securities unless dividends have been or contemporaneously are ratably declared
and paid

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or declared and a sum sufficient for the payment thereof set apart for such
payment on the Series A Convertible Preferred Stock.

     3.   LIQUIDATION PREFERENCE.

     (a)  In the event of any bankruptcy, liquidation, dissolution or winding up
of the Corporation, either voluntary or involuntary, each holder of Series A
Convertible Preferred Stock at the time thereof shall be entitled to receive,
prior and in preference to any distribution of any of the assets or funds of the
Corporation to the holders of the Common Stock or other Junior Stock by reason
of their ownership of such stock, an amount per share of Series A Convertible
Preferred Stock equal to the sum of (x) the applicable Stated Value plus any
declared and unpaid dividends to the date of liquidation, plus (y) 10% of such
Stated Value per annum, calculated from the date of issuance of such share
through date of payment of the liquidation preference as set forth in this
Section 3 (the "Liquidation Preference"). After the payment of the full
Liquidation Preference on account of all shares of Series A Convertible
Preferred Stock as set forth in this Section 3, the remaining assets of the
Corporation legally available for distribution, if any, shall be distributed
ratably to the holders of the Common Stock. If the assets and funds legally
available for distribution among the holders of Series A Convertible Preferred
Stock shall be insufficient to permit the payment to the holders of the full
aforesaid preferential amount, then the assets and funds shall be distributed
ratably among holders of Series A Convertible Preferred Stock in proportion to
the number of shares of Series A Convertible Preferred Stock owned by each
holder. If the assets and funds of the Corporation available for distribution to
stockholders upon any bankruptcy, liquidation, dissolution or winding up of the
affairs of the Corporation, whether voluntary or involuntary, shall be
insufficient to permit the payment to holders of the full aforesaid preferential
amount and amounts payable to holders of outstanding Parity Securities, the
holders of Series A Convertible Preferred Stock and the holders of such other
Parity Securities shall share ratably (and ratably as to cash, in-kind or other
distributions) in any distribution of assets of the Corporation in proportion to
the full respective preferential amounts to which they are entitled.

     (b)  Except as described in the following sentence, a merger,
recapitalization, reorganization, sale of voting control to a single buyer or a
group of related buyers in one or a series of related transactions, or other
business combination transaction involving the Corporation in which the
shareholders of the Corporation immediately prior to the consummation of such
transaction do not own at least a majority of the outstanding shares of the
surviving corporation or the Corporation (as applicable) immediately following
the consummation of such transaction or sale of all or substantially all of the
assets of the Corporation (collectively, a "Liquidation Event") shall be deemed
to be a liquidation of the Corporation. Notwithstanding the foregoing, the
following shall not be deemed to be a Liquidation Event: a merger of the
Corporation with a public company (I) in which the merger consideration to be
received by the holders of the Series A Convertible Preferred Stock is fully
registered marketable securities (the "Merger Shares") which are not subject to
any restrictions on transfer, (II) in which the value of such merger
consideration for each share of Series A Convertible Preferred Stock, valued at
the average closing price of the Merger Shares for the 30 days prior to the
consummation of the merger, or such lesser period which follows the public
announcement of the merger, is greater than 120% of the Liquidation Preference
per share as of the date of consummation of the merger, and (III) with aggregate
trading volume for the 30

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calendar days prior to the merger date of at least 10 times the aggregate number
of Merger Shares received by all holders of Series A Convertible Preferred
Stock.

     (c)  In any Liquidation Event, if the consideration received by the
Corporation is other than cash, its value will be deemed its fair market value
as determined in good faith by the Board of Directors. Any securities shall be
valued as follows:

                    (i)  Securities not subject to investment letter or other
similar restrictions on free marketability covered by subsection (ii) below:

                    (A)  If traded on a securities exchange or through The
     Nasdaq National Market or Small Cap Market, the value shall be deemed to be
     the average of the closing prices of the securities on such quotation
     system over the thirty (30) day period ending three (3) days prior to the
     closing of the Liquidation Event;

                    (B)  If actively traded over-the-counter, the value shall be
     deemed to be the average of the closing bid or sale prices (whichever is
     applicable) over the thirty (30) day period ending three (3) days prior to
     the closing of the Liquidation Event; and

                    (C)  If there is no active public market, the value shall be
     the fair market value thereof, as mutually determined by the Board of
     Directors and the holders of at least a majority of the voting power of all
     then outstanding shares of Series A Convertible Preferred Stock.

                    (ii) The method of valuation of securities subject to
investment letter or other restrictions on free marketability (other than
restrictions arising solely by virtue of a shareholder's status as an affiliate
or former affiliate) shall be to make an appropriate discount from the market
value determined as above in subsections (i)(A), (B) or (C) to reflect the
approximate fair market value thereof, as mutually determined by the Board of
Directors and the holders of at least a majority of the voting power of all then
outstanding shares of Series A Convertible Preferred Stock.

     4.   VOTING RIGHTS.

     In addition to any voting rights provided elsewhere herein or in the
Corporation's Restated Articles of Incorporation, as it may be amended or
restated from time to time (the "Articles of Incorporation"), and any voting
rights provided by law, the holders of shares of Series A Convertible Preferred
Stock shall have the following voting rights:

          (a)  Election of Directors.

                    (i)  Subject to the terms hereof, the holders of the Series
A Convertible Preferred Stock, voting as a single class in accordance with
Section 4(d), shall have the right to elect one director (in addition to the
directors elected by the holders of Common Stock or any other capital stock of
the Corporation).

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                    (ii)   Any director elected by the holders of shares of
Series A Convertible Preferred Stock shall be referred to herein as a "Series A
Preferred Director." Subject to Section 4(a)(v), the initial term of the
director to be appointed pursuant to Section 4(a)(i) will commence upon his/her
election by the Series A Convertible Preferred Stock and shall expire at the
first annual meeting of stockholders of the Corporation. Upon expiration of the
initial term of such Series A Preferred Director, so long as the Series A
Convertible Preferred Stock is outstanding, the holders of the Series A
Convertible Preferred Stock shall have the right to elect a Series A Preferred
Director to replace such director in the same manner described above in Section
4(a)(i). Subject to Section 4(a)(v), a Series A Preferred Director so elected
shall hold office for a term expiring at the annual meeting of stockholders in
the year following the election of such director. Notwithstanding the foregoing,
but subject to Section 4(a)(v), a Series A Preferred Director elected under
Section 4(a)(i) shall serve until such Series A Preferred Director's successor
is duly elected and qualified or until such director's earlier removal as
provided in Section 4(a)(iii) or death or resignation and, in the event a
vacancy occurs, a replacement Series A Preferred Director shall be selected as
provided in Section 4(a)(i).

                    (iii)  A Series A Preferred Director may be removed by, and
shall not be removed except by, the vote of the holders of record of a majority
of the outstanding shares of Series A Convertible Preferred Stock, voting
together as a single class.

                    (iv)   The Corporation shall at all times reserve and keep
available a vacant seat on the Board of Directors solely for the purpose of
enabling the holders of the Series A Convertible Preferred Stock to designate a
Series A Preferred Director as provided in this Section 4(a).

                    (v)    This Section 4(a) shall survive a Qualified Public
Offering until such time as the holders of Series A Convertible Preferred Stock
and their Affiliates own in the aggregate less than 25% of their initial
holdings of Series A Shares determined after the Subsequent Closing (as defined
in the Preferred Stock Purchase Agreement).

          (b)  Certain Corporate Actions.

     Until a Qualified Public Offering or until such time as the holders of
Series A Convertible Preferred Stock collectively with their Affiliates hold
less than an aggregate of 50% of the number of shares of Series A Convertible
Preferred Stock issued pursuant to the Preferred Stock Purchase Agreement (as
adjusted in connection with the events described in Section 6) determined after
the Subsequent Closing, the Corporation shall not, and shall not permit any of
its subsidiaries to, without first obtaining the affirmative vote or written
consent of the holders of a majority of the shares of Series A Convertible
Preferred Stock, voting as a single class in accordance with Section 4(d):

                    (A)  amend, repeal, modify or supplement any provision of
     the Restated Certificate of Incorporation (including any certificate of
     designation forming a part thereof), the Bylaws of the Corporation, as in
     effect on the Issuance Date, or any successor articles of incorporation or
     bylaws or this Certificate of Designation, Number, Powers, Preferences and
     Relative, Participating, Optional and Other Rights of Series A Convertible
     Preferred Stock (the "Certificate of Designation");

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                    (B)  authorize or permit the Corporation or any subsidiary
     of the Corporation to issue any capital stock or any options, warrants or
     other rights exchangeable or exercisable therefor, other than (i) shares of
     Series A Convertible Preferred Stock pursuant to the Preferred Stock
     Purchase Agreement, (ii) Common Stock upon conversion of the Series A
     Convertible Preferred Stock or upon the exercise of stock options to
     purchase up to 2,460,000 shares of Common Stock, (iii) securities issued as
     consideration for any acquisition approved by a majority of the Board of
     Directors (including the affirmative vote of the Series A Preferred
     Directors), (iv) up to $15 million of Common Stock, issued as consideration
     for any acquisition approved by a majority of the Board of Directors
     (without the affirmative vote of the Series A Preferred Directors),
     provided such Common Stock is valued at no less than the greater of (1) the
     Stated Value (as adjusted for stock splits, combinations, stock dividends
     and the like) and (2) the average of the closing price for the Common Stock
     for the 30 days prior to the issuance, (v) a warrant to purchase 210,000
     shares of Common Stock to Spinway, Inc. (the "Spinway Warrant"), (vi)
     210,000 shares of Common Stock upon exercise of the Spinway Warrant, or
     (vii) shares of Common Stock in exchange for shares of common stock of
     Tutopia.com, Inc. ("Tutopia") upon a change-in-control of the Corporation
     pursuant to the Tutopia Stockholders Agreement dated as of April 24, 2000;

                    (C)  reclassify any class or series of any Common Stock into
     shares having any preference or priority as to dividends or liquidation
     superior to or on a parity with any such preference or priority of Series A
     Convertible Preferred Stock;

                    (D)  authorize or effect, in a single transaction or through
     a series of related transactions, (1) a liquidation, winding up or
     dissolution of the Corporation or adoption of any plan for the same; (2) a
     Liquidation Event; or (3) any direct or indirect purchase or other
     acquisition of the Corporation or any of its subsidiaries of any capital
     stock (other than the Series A Convertible Preferred Stock pursuant to its
     terms);

                    (E)  enter into or otherwise become a party to any agreement
     whereby any shareholder or shareholders of the Corporation shall transfer
     capital stock of the Corporation to an independent third party or a group
     of independent third parties pursuant to which such parties acquire capital
     stock of the Corporation possessing the voting power to elect a majority of
     the Board of Directors;

                    (F)  declare or pay or set aside for payment any dividend or
     distribution or other payment upon the Common Stock or upon any other
     Junior Stock, nor redeem, purchase or otherwise acquire any Common Stock or
     other Junior Stock for any consideration (or pay or make available any
     moneys, whether by means of a sinking fund or otherwise, for the redemption
     of or other distribution or payment with respect to any shares of any
     Common Stock or other Junior Stock), except for the repurchase of shares of
     Common Stock from directors, consultants or employees of the Corporation or
     any subsidiary pursuant to agreements approved by the disinterested
     directors on the Board of Directors, under which the Corporation has the
     right to repurchase such shares upon the occurrence of certain events,
     including but not limited to, termination of employment or services;

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                    (G)  approve the annual budget of the Corporation and its
     subsidiaries (the "Annual Budget");

                    (H)  enter into any financial commitment over and above
     those approved in the annual budget in excess of $15 million in the
     aggregate (for the Corporation and its subsidiaries, taken together),
     except as prescribed in the Annual Budget;

                    (I)  dismiss or hire or modify or enter into any employment
     agreement, non-competition agreement, bonus or stock issuance arrangements
     or other compensation (including, without limitation, fringe benefit)
     arrangements with its President, Chief Executive Officer or Chief Financial
     Officer, or other equivalent or senior level officer;

                    (J)  permit the creation or existence of any lien, mortgage,
     pledge, hypothecation, assignment, security interest, charge or
     encumbrance, or preference, priority or other security agreement or
     preferential arrangement of any kind or nature whatsoever on any of the
     Corporation's or any of its subsidiaries' assets with an aggregate value in
     excess of $15 million, except as part of any financing in the ordinary
     course of business;

                    (K)  make any capital expenditure in any fiscal year in
     excess of $15 million in the aggregate (for the Corporation and its
     subsidiaries, taken together), except as prescribed in the Annual Budget;

                    (L)  acquire any assets or equity or other interest in any
     other entity with a value in excess of $15 million in the aggregate (for
     the Corporation and its subsidiaries, taken together), except as prescribed
     in the Annual Budget;

                    (M)  incur indebtedness for borrowed money (including,
     without limitation, any capitalized lease obligations, accounts receivable
     financing or other asset-backed financing), any guarantee or other similar
     contingent obligation or any lease financing (whether a capitalized lease,
     operating lease, pursuant to a sale leaseback arrangement or otherwise), in
     excess of $15 million in the aggregate (for the Corporation and its
     subsidiaries, taken together), except as prescribed in the Annual Budget;

                    (N)  amend, supplement, restate, revise, waive or otherwise
     modify any stock option plan, agreement or other arrangement of the
     Corporation (each, a "Stock Option Plan"), as in effect on June 15, 2000;

                    (O)  create or adopt any stock option plan, stock
     appreciation rights plan, bonus plan or similar plan that was not in
     existence on June 15, 2000, except as approved by the Compensation
     Committee of the Board of Directors;

                    (P)  dispose of or acquire assets with a value in excess of
     $15 million other than in the normal course of business;

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                    (Q)  liquidate, dissolve or voluntarily elect to commence
     bankruptcy or insolvency proceedings under applicable laws;

                    (R)  change in any material respect the nature of the
     business of the Corporation and its subsidiaries taken as a whole;

                    (S)  enter into any transaction, or any agreement or
     understanding with any affiliate of the Corporation or any subsidiary
     thereof, other than a wholly-owned subsidiary of the Corporation;

                    (T)  (i) solicit or negotiate any inquiries or proposals
     with respect to (x) any direct or indirect issuance, sale, disposition or
     redemption of any securities of Latin Guide, Inc. ("LGI"), Tutopia or any
     of Tutopia's subsidiaries, (y) the direct or indirect sale or disposition
     of all or any material portion of the assets or business of LGI, Tutopia or
     any of Tutopia's subsidiaries, or (z) any merger, reorganization,
     consolidation or recapitalization or other similar transaction involving
     LGI, Tutopia or any of Tutopia's subsidiaries; or (ii) discuss with or
     provide to any person or entity information of LGI, Tutopia or any of
     Tutopia's subsidiaries with respect to or in contemplation of any of the
     foregoing; or

                    (U)  agree to do any of the foregoing.

          (c)  Additional Voting Rights.  Except as required by law, the holders
of Series A Convertible Preferred Stock shall be entitled to notice of any
stockholders' meeting and to vote together as a single class with the holders of
Common Stock, on an as-converted basis, upon any matter submitted to the
stockholders for a vote, other than with respect to the election of directors,
as follows:  (i) the holders of the Series A Convertible Preferred Stock shall
have one (1) vote for each full share of Common Stock into which their
respective shares of Series A Convertible Preferred Stock are convertible on the
record date for the vote and (ii) the holders of Common Stock shall have one (1)
vote per share of Common Stock.

          (d)  Means of Voting. On all matters on which the holders of Series A
Convertible Preferred Stock are entitled to vote pursuant to Section 4(a) and
4(b), each holder of Series A Convertible Preferred Stock shall be entitled to
one vote for each share held by such holder.  The rights of the holders of
Series A Convertible Preferred Stock under this Section 4 may be exercised (i)
with respect to the election of the Series A Preferred Directors pursuant to
Section 4(a), at a meeting of the holders of the Series A Convertible Preferred
Stock or by written consents executed by the holders entitled to vote therefor
and delivered to the Secretary or Assistant Secretary of the Corporation; (ii)
at any meeting of stockholders of the Corporation on all matters other than the
election of directors;  (iii)  at a meeting of the holders of shares of such
Series A Convertible Preferred Stock, called for the purpose by the Corporation
or by the holders of record of 25% or more of the Series A Convertible Preferred
Stock, pursuant to requests delivered in writing to the Secretary or Assistant
Secretary of the Corporation; (iv) by written consent signed by the holders of
the requisite percentage of the then outstanding shares, delivered to the
Secretary or Assistant Secretary of the Corporation; or (v) with respect to the
voting rights referred to in Section 4(c), at any meeting of the stockholders of
the Corporation or by written consent signed by the holders of the requisite
percentage of the then outstanding

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shares of Common Stock (and Series A Convertible Preferred Stock), delivered to
the Secretary or Assistant Secretary of the Corporation. Except to the extent
otherwise provided herein or to the extent that holders of 75% of the Series A
Convertible Preferred Stock decide otherwise, any meeting of the holders of
Series A Convertible Preferred Stock shall be conducted in accordance with the
provisions of the By-Laws of the Corporation applicable to meetings of
stockholders. In the event of a conflict or inconsistency between the By-Laws of
the Corporation and any term of this Certificate of Designation, including, but
not limited to this Section 4, the terms of this Certificate of Designation
shall prevail.

     5.   CONVERSION.

          Shares of Series A Convertible Preferred Stock may be converted into
shares of Common Stock, on the terms and conditions set forth in this Section 5.

          (a)  Optional Conversion. (i) At any time and from time to time, each
holder of shares of Series A Convertible Preferred Stock may, upon 30 days'
notice to the Corporation, convert all or any portion of such shares held by
such holder into the number of shares of Common Stock determined by dividing (x)
the applicable Stated Value multiplied by the number of shares surrendered for
conversion plus any declared but unpaid dividends on such shares, by (y) the
Conversion Price on the date of conversion determined in accordance with Section
5(c).

                    (ii)   References in this Section 5 to "Common Stock" shall
include all stock or other securities or property (including cash) into which
Common Stock is converted following any merger, reorganization or
reclassification of the capital stock of the Corporation.

          (b)  Mandatory Conversion. Each share of Series A Convertible
Preferred Stock shall automatically be converted into such number of shares of
Common Stock as is determined by dividing (x) the applicable Stated Value
multiplied by the number of shares surrendered for conversion plus any declared
but unpaid dividends on such shares, by (y) the Conversion Price on the date of
conversion determined in accordance with Section 5(c), without further action by
the holders of such shares and whether or not the certificates representing such
shares are surrendered to the Corporation or its transfer agent, upon the
closing of an underwritten public offering of shares of Common Stock for which
the Corporation has obtained a firm commitment from one or more underwriter(s)
for at least $75 million of Common Stock and in which the Corporation receives
gross proceeds from the sale of Common Stock to the public of at least $56.25
million (before deduction of underwriter's discounts and commissions), and which
values the equity of the Corporation at no less than $400 million pre-offering
(a "Qualified Public Offering"). Except for the purposes of the calculation in
the immediately preceding sentence, in the event of a Qualified Public Offering,
the person(s) entitled to receive the Common Stock issuable upon conversion of
Series A Convertible Preferred Stock shall not be deemed to have converted such
Series A Convertible Preferred Stock until the closing of such offering.

          (c)  Conversion Price. The initial Conversion Price per share for the
Class I Preferred shall be Twelve and 31/100 Dollars ($12.31) and the initial
Conversion Price for the

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Class II Preferred shall be the Closing Per Share Price, each subject to
adjustment as provided in Section 6 hereof.

          (d)  Common Stock. The Common Stock to be issued upon conversion
hereunder shall be fully paid and nonassessable.

          (e)  Procedures for Conversion.

                    (i)  In order to convert shares of Series A Convertible
Preferred Stock into shares of Common Stock pursuant to Section 5(a) (or, in the
case of an automatic conversion pursuant to Section 5(b), to receive a
certificate for such holder's shares of Common Stock outstanding as a result of
such conversion), the holder shall surrender the certificate or certificates
therefore, duly endorsed for transfer, at any time during normal business hours,
to the Corporation at its principal or at such other office or agency then
maintained by it for such purpose (the "Payment Office"), accompanied, in the
case of a conversion pursuant to Section 5(a), by written notice to the
Corporation of such holder's election to convert and (if so required by the
Corporation or any conversion agent) by an instrument of transfer, in form
reasonably satisfactory to the Corporation and to any conversion agent, duly
executed by the registered holder or by his duly authorized attorney, and any
taxes required pursuant to Section 5(e)(iii). As promptly as practicable after
the surrender for conversion of any share of Series A Convertible Preferred
Stock in the manner provided in the preceding sentence, and the payment in cash
of any amount required by the provisions of Section 5(e)(iii), but in any event
within five Trading Days of such surrender for payment, the Corporation will
deliver or cause to be delivered at the Payment Office to or upon the written
order of the holder of such shares, certificates representing the number of full
shares of Common Stock issuable upon such conversion, issued in such name or
names as such holder may direct. Such conversion shall be deemed to have been
made immediately prior to the close of business on the date of such surrender of
the shares in proper order for conversion, and all rights of the holder of such
shares as a holder of such shares shall cease at such time and the person or
persons in whose name or names the certificates for such shares of Common Stock
are to be issued shall be treated for all purposes as having become the record
holder or holders thereof at such time; provided, however, that any such
surrender and payment on any date when the stock transfer books of the
Corporation shall be closed shall constitute the person or persons in whose name
or names the certificates for such shares of Common Stock are to be issued as
the record holder or holders thereof for all purposes immediately prior to the
close of business on the next succeeding day on which such stock transfer books
are opened and such conversion shall be at the Conversion Price in effect at
such time on such succeeding day.

     For purposes hereof, "Trading Day" shall mean (i) any day on which stock is
traded on the principal stock exchange on which the Common Stock is listed or
admitted to trading, (ii) if the Common Stock is not then listed or admitted to
trading on any stock exchange but is traded on the Nasdaq Stock Market, any day
on which stock is traded on the Nasdaq Stock Market, or (iii) if the Common
Stock is not then traded on the Nasdaq Stock Market, any day on which stock is
traded in the over-the-counter market, as reported by the National Quotation
Bureau Incorporated (or any similar organization or agency succeeding to its
functions of reporting prices).

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                    (ii)   The Corporation shall not be required to issue
fractional shares of Common Stock upon conversion of shares of Series A
Convertible Preferred Stock. At the Corporation's discretion, in the event the
Corporation determines not to issue fractional shares, in lieu of any fractional
shares to which the holder would otherwise be entitled, the Corporation shall
pay cash equal to such fraction multiplied by the closing price of the Common
Stock on the date of conversion.

                    (iii)  The issuance of certificates for shares of Common
Stock upon conversion shall be made without charge for any issue, stamp or other
similar tax in respect of such issuance. However, if any such certificate is to
be issued in a name other than that of the holder of record of the shares
converted, the person or persons requesting the issuance thereof shall pay to
the Corporation the amount of any tax which may be payable in respect of any
transfer involved in such issuance or shall establish to the satisfaction of the
Corporation that such tax has been paid or is not payable.

          (f)  Reservation of Stock Issuable Upon Conversion. Subject to the
limitation set forth in the last sentence of this Section 5(f), the Corporation
shall reserve and keep available out of its authorized but unissued shares of
Common Stock, solely for the purpose of effecting the conversion of the shares
of the Series A Convertible Preferred Stock, 2,030,869 shares of Common Stock.
If at any time the number of authorized but unissued shares of Common Stock
shall not be sufficient to effect the conversion of all then outstanding shares
of the Series A Convertible Preferred Stock without regard to whether the
holders of Series A Convertible Preferred Stock are then entitled to convert,
the Corporation will take such corporate action as may, in the opinion of its
counsel, be necessary to increase its authorized but unissued shares of Common
Stock to such number of shares as shall be sufficient for such purpose,
including, without limitation, taking appropriate board action, recommending
such an increase to the holders of Common Stock, holding shareholders meetings,
soliciting votes and proxies in favor of such increase to obtain the requisite
stockholder approval and upon such approval, the Corporation shall reserve and
keep available such additional shares solely for the purpose of effecting the
conversion of the shares of the Series A Convertible Preferred Stock.

          (g)  Merger, Etc.

                    (i)   Notwithstanding any other provision hereof, in case of
any merger or other business combination transaction involving the Corporation
which does not constitute a Liquidation Event, then, concurrently with the
consummation of such transaction, provision shall be made so that each share of
Series A Convertible Preferred Stock shall thereafter be convertible into the
number of shares of stock or other securities or property (including cash) to
which a holder of the number of shares of Common Stock deliverable upon
conversion of such share of Series A Convertible Preferred Stock would have been
entitled assuming conversion immediately prior to the closing of the
transaction.

                    (ii)  In case of any merger or other business combination
transaction involving the Corporation which does not constitute a Liquidation
Event, in which the Corporation is not the surviving entity, and the Corporation
or the holders do not otherwise convert all outstanding shares of Series A
Convertible Preferred Stock, the Series A Convertible Preferred Stock shall be
converted into or exchanged for and shall become shares of the

                                      -11-
<PAGE>

surviving corporation having, in respect of the surviving corporation,
substantially the same powers, preferences and relative participating, optional
or other special rights, and the qualifications, limitations or restrictions
thereon, that the Series A Convertible Preferred Stock had immediately prior to
such transaction.

     6.   ADJUSTMENTS.

     The Conversion Price shall be subject to adjustment from time to time as
set forth in this Section 6. The Corporation shall give holders of Series A
Convertible Preferred Stock notice of any event described below which requires
an adjustment pursuant to this Section 6 at the time of such event.

          (a)  Definitions. As used in this Section 6, the following terms have
the respective meanings set forth below:

          "Additional Shares of Common Stock" shall mean all shares of Common
Stock issued by the Corporation after the Initial Closing (as defined in the
Preferred Stock Purchase Agreement).

          "Convertible Securities" shall mean evidences of indebtedness, shares
of stock of other securities which are convertible into or exchangeable, with or
without payment of additional consideration in cash or property, for Additional
Shares of Common Stock, either immediately or upon the occurrence of a specified
date or a specified event.

          "Fully Diluted Outstanding" shall mean, when used with reference to
Common Stock, at any date as of which the number of shares thereof is to be
determined, all shares of Common Stock Outstanding at such date and all shares
of Common Stock issuable in respect of Series A Convertible Preferred Stock
outstanding on such date and other securities convertible into, or options or
warrants to purchase, shares of Common Stock outstanding on such date, whether
or not such options, warrants or other securities are presently convertible or
exercisable.

          "Other Property" shall have the meaning set forth in Section 6(i).

          "Outstanding" shall mean, when used with reference to Common Stock, at
any date as of which the number of shares thereof is to be determined, all
issued shares of Common Stock, except shares then owned or held by or for the
account of the Corporation or any subsidiary of the Corporation, and shall
include all shares issuable in respect of outstanding scrip or any certificates
representing fractional interests in shares of Common Stock.

          "Permitted Issuances" shall mean (i) the issuance of up to 2,460,000
shares of Common Stock issuable pursuant to options to purchase Common Stock
under the Stock Option Plan, (ii) shares of Common Stock issued or issuable in
connection with a Qualified Public Offering, (iii) shares of Common Stock issued
upon conversion of Series A Convertible Preferred Stock, (iv) securities issued
as consideration for any acquisition approved by a majority of the Board of
Directors (including the affirmative vote of the Series A Preferred Director),
(v) the issuance of up to 820,471 shares of Series A Convertible Preferred Stock
at the Subsequent Closing (as defined in the Preferred Stock Purchase
Agreement), (vi) the issuance of an aggregate of up to 100,000 additional shares
of Common Stock (as adjusted for stock splits,

                                      -12-
<PAGE>

combinations, stock dividends and the like) in transactions approved by a
majority of the Board of Directors, (vii) the issuance of an aggregate of up to
another 100,000 additional shares of Common Stock (as adjusted for stock splits,
combinations, stock dividends and the like) in transactions approved by a
majority of the Board of Directors (including the affirmative vote of the Series
A Preferred Director), (viii) the Spinway Warrant, and (ix) 210,000 shares of
Common Stock upon exercise of the Spinway Warrant.

          "Qualified Private Offering" shall mean a private equity offering
resulting in gross proceeds to the Corporation of at least $30 million, in which
the securities issued contain anti-dilution provisions no more favorable to the
investor than the anti-dilution provisions of the Series A Convertible Preferred
Stock which take effect following the consummation of a Qualified Private
Offering.

          "Stock Option Plan" shall mean the IFX Corporation Directors Stock
Option Plan and the 1998 IFX Corporation Stock Option and Incentive Plan, as
amended.

          (b)  Stock Dividends, Subdivisions and Combinations. If at any time
the Corporation shall:

                    (i)     take a record of the holders of its Common Stock for
          the purpose of entitling them to receive a dividend payable in, or
          other distribution of, Additional Shares of Common Stock,

                    (ii)    subdivide its outstanding shares of Common Stock
          into a larger number of shares of Common Stock, or

                    (iii)   combine its outstanding shares of Common Stock into
          a smaller number of shares of Common Stock,

then the applicable Conversion Price immediately after the occurrence of any
such event shall be adjusted to equal the product of (A) the Conversion Price
immediately prior to the occurrence of such event and (B) a fraction, the
numerator of which shall be the number of Fully Diluted Outstanding shares of
Common Stock immediately prior to the occurrence of such event and the
denominator of which shall be the number of Fully Diluted Outstanding shares of
Common Stock immediately after the occurrence of such event.

          (c)  Issuance of Additional Shares of Common Stock. (ii) In the event
that prior to the consummation of or in connection with a Qualified Private
Offering, the Corporation shall issue or sell any Additional Shares of Common
Stock, other than Permitted Issuances, for a consideration per Additional Share
of Common Stock less than the applicable Conversion Price, then the applicable
Conversion Price shall be reduced to the consideration per Additional Share of
Common Stock paid for such Additional Shares of Common Stock.

                    (ii)    In the event that following the consummation of a
Qualified Private Offering, the Corporation shall issue or sell any Additional
Shares of Common Stock, other than Permitted Issuances, for a consideration per
Additional Share of Common Stock less than the applicable Conversion Price, then
the applicable Conversion Price shall be reduced to a price determined by
dividing (A) an amount equal to the sum of (x) the number of

                                      -13-
<PAGE>

Fully Diluted Outstanding shares of Common Stock immediately prior to such issue
or sale multiplied by the then existing Conversion Price plus (y) the aggregate
consideration, if any, received by the Corporation upon such issue or sale, by
(B) the total number of Fully Diluted Outstanding shares of Common Stock
outstanding immediately after such issue or sale.

                    (iii)   The provisions of this Section 6(c) shall not apply
to any issuance of Additional Shares of Common Stock for which an adjustment is
provided under Section 6(b). No adjustment shall be made under this Section 6(c)
upon the issuance of any Additional Shares of Common Stock which are issued
pursuant to the exercise of any warrants or other subscription or purchase
rights or pursuant to the exercise of any conversion or exchange rights in any
Convertible Securities, if any such adjustment shall previously have been made
upon the issuance of such warrants or other rights or upon the issuance of such
Convertible Securities (or upon the issuance of any warrant or other rights
therefor) pursuant to Section 6(d) or Section 6(e).

          (d)  Issuance of Warrants or Other Rights. Except with respect to
Permitted Issuances, if at any time the Corporation shall take a record of the
holders of its Common Stock for the purpose of entitling them to receive a
distribution of, or shall in any manner (whether directly or by assumption in a
merger in which the Corporation is the surviving corporation) issue or sell, any
warrants or other rights to subscribe for or purchase any Additional Shares of
Common Stock or any Convertible Securities, whether or not the rights to
exchange or convert thereunder are immediately exercisable, and the price per
share for which Common Stock is issuable upon the exercise of such warrants or
other rights or upon conversion or exchange of such Convertible Securities shall
be less than the applicable Conversion Price in effect immediately prior to the
time of such distribution, issue or sale, then the applicable Conversion Price
shall be adjusted as provided in Section 6(c)(i) or (ii), as applicable, on the
basis that (i) the maximum number of Additional Shares of Common Stock issuable
pursuant to all such warrants or other rights or necessary to effect the
conversion or exchange of all such Convertible Securities shall be deemed to
have been issued and outstanding, (ii) the price per share for such Additional
Shares of Common Stock shall be deemed to be the lowest price per share at which
such Additional Shares of Common Stock are issuable to such holders, and (iii)
the Corporation shall have received all of the consideration, if any, payable
for such warrants or other rights as of the date of the actual issuance thereof.
No further adjustments of the Conversion Price shall be made upon the actual
issue of such Common Stock or of such Convertible Securities upon exercise of
such warrants or other rights or upon the actual issue of such Common Stock upon
such conversion or exchange of such Convertible Securities.

          (e)  Issuance of Convertible Securities. Except with respect to
Permitted Issuances, if at any time the Corporation shall take a record of the
holders of its Common Stock for the purpose of entitling them to receive a
distribution of, or shall in any manner (whether directly or by assumption in a
merger in which the Corporation is the surviving corporation) issue or sell, any
Convertible Securities, whether or not the rights to exchange or convert
thereunder are immediately exercisable, and the price per share for which Common
Stock is issuable upon such conversion or exchange shall be less than the
applicable Conversion Price in effect immediately prior to the time of such
issue or sale, then the applicable Conversion Price shall be adjusted as
provided in Section 6(c)(i) or (ii), as applicable, on the basis that (i) the
maximum number of Additional Shares of Common Stock issuable upon the conversion
or

                                      -14-
<PAGE>

exchange of all such Convertible Securities shall be deemed to have been issued
and outstanding, (ii) the price per share of such Additional Shares of Common
Stock shall be deemed to be the lowest possible price in any range of prices at
which such Additional Shares of Common Stock are available to such holders, and
(iii) the Corporation shall have received all of the consideration payable
therefor, if any, as of the date of actual issuance of such Convertible
Securities. No further adjustment of the Conversion Price shall be made under
this Section 6(e) upon the issuance of any Convertible Securities which are
issued pursuant to the exercise of any warrants or other subscription or
purchase rights therefor, if any such adjustment shall previously have been made
upon the issuance of such warrants or other rights pursuant to Section 6(d). No
further adjustments of the Conversion Price shall be made upon the actual issue
of such Common Stock upon conversion or exchange of such Convertible Securities
and, if any issue or sale of such Convertible Securities is made upon exercise
of any warrant or other right to subscribe for or to purchase or any warrant or
other right to purchase any such Convertible Securities for which adjustments
thereof have been or are to be made pursuant to other provisions of this Section
6, no further adjustments shall be made by reason of such issue or sale.

          (f)  Superseding Adjustment. If, at any time after any adjustment of
the applicable Conversion Price shall have been made pursuant to Section 6(d) or
6(e) as the result of any issuance of warrants, rights or Convertible
Securities, and either

                    (i)     such warrants or rights, or the right of conversion
          or exchange in such other Convertible Securities, shall expire, and
          all or a portion of such warrants or rights, or the right of
          conversion or exchange with respect to all or a portion of such other
          Convertible Securities, as the case may be, shall not have been
          exercised, or

                    (ii)    the consideration per share for which shares of
          Common Stock are issuable pursuant to such warrants or rights, or such
          other Convertible Securities, shall be increased or decreased by
          virtue of provisions therein contained,

then such previous adjustment shall be rescinded and annulled and the Additional
Shares of Common Stock which were deemed to have been issued by virtue of the
computation made in connection with the adjustment so rescinded and annulled
shall no longer be deemed to have been issued by virtue of such computation.
Thereupon, a recomputation shall be made of the effect of such rights or options
or other Convertible Securities on the applicable Conversion Price, on the basis
of

                    (iii)   treating the number of Additional Shares of Common
          Stock or other property, if any, theretofore actually issued or
          issuable pursuant to the previous exercise of any such warrants or
          rights or any such right of conversion or exchange, as having been
          issued on the date or dates of any such exercise and for the
          consideration actually received and receivable therefor, and

                    (iv)    treating any such warrants or rights or any such
          other Convertible Securities which then remain outstanding as having
          been granted or issued immediately after the time of such increase or
          decrease of the consideration

                                      -15-
<PAGE>

          per share for which shares of Common Stock or other property are
          issuable under such warrants or rights or other Convertible
          Securities.

          (g)  Other Provisions Applicable to Adjustments Under This Section.
The following provisions shall be applicable to the making of adjustments
provided for in this Section 6:

                    (i)    Computation of Consideration. To the extent that any
          Additional Shares of Common Stock or any Convertible Securities or any
          warrants or other rights to subscribe for or purchase any Additional
          Shares of Common Stock or any Convertible Securities shall be issued
          for cash consideration, the consideration received by the Corporation
          therefor shall be the amount of the cash received by the Corporation
          therefor, or, if such Additional Shares of Common Stock or Convertible
          Securities are offered by the Corporation for subscription, the
          subscription price, or, if such Additional Shares of Common Stock or
          Convertible Securities are sold to underwriters or dealers for public
          offering without a subscription offering, the public offering price
          (in any such case subtracting any amounts paid or receivable for
          accrued interest or accrued dividends, but not subtracting any
          compensation, discounts or expenses paid or incurred by the
          Corporation for and in the underwriting of, or otherwise in connection
          with, the issuance thereof). To the extent that such issuance shall be
          for a consideration other than cash, then, except as herein otherwise
          expressly provided, the amount of such consideration shall be deemed
          to be the fair value of such consideration at the time of such
          issuance as determined in good faith by the Board of Directors. In
          case any Additional Shares of Common Stock or any Convertible
          Securities or any warrants or other rights to subscribe for or
          purchase such Additional Shares of Common Stock or Convertible
          Securities shall be issued in connection with any merger in which the
          Corporation issues any securities, the amount of consideration
          therefor shall be deemed to be the fair value, as determined in good
          faith by the Board of Directors, of such portion of the assets and
          business of the nonsurviving corporation as the Board of Directors in
          good faith shall determine to be attributable to such Additional
          Shares of Common Stock, Convertible Securities, warrants or other
          rights, as the case may be. The consideration for any Additional
          Shares of Common Stock issuable pursuant to any warrants or other
          rights to subscribe for or purchase the same shall be the
          consideration received by the Corporation for issuing such warrants or
          other rights plus the additional consideration payable to the
          Corporation upon exercise of such warrants or other rights. The
          consideration for any Additional Shares of Common Stock issuable
          pursuant to the terms of any Convertible Securities shall be the
          consideration, if any, received by the Corporation for issuing
          warrants or other rights to subscribe for or purchase such Convertible
          Securities, plus the consideration paid or payable to the Corporation
          in respect of the subscription for or purchase of such Convertible
          Securities, plus the additional consideration, if any, payable to the
          Corporation upon the exercise of the right of conversion or exchange
          in such Convertible Securities. In case of the issuance at any time of
          any Additional Shares of Common Stock or Convertible Securities in
          payment or satisfaction of any dividends upon any class of stock other
          than

                                      -16-
<PAGE>

          Common Stock, the Corporation shall be deemed to have received for
          such Additional Shares of Common Stock or Convertible Securities a
          consideration equal to the amount of such dividend so paid or
          satisfied.

                    (ii)   When Adjustments to Be Made. The adjustments required
          by this Section 6 shall be made whenever and as often as any specified
          event requiring an adjustment shall occur. For the purpose of any
          adjustment, any specified event shall be deemed to have occurred at
          the close of business on the date of its occurrence.

                    (iii)  When Adjustment Not Required. If the Corporation
          shall take a record of the holders of its Common Stock for the purpose
          of entitling them to receive a dividend or distribution or
          subscription or purchase rights and shall, thereafter and before the
          distribution to stockholders thereof, legally abandon its plan to pay
          or deliver such dividend, distribution, subscription or purchase
          rights, then thereafter no adjustment shall be required by reason of
          the taking of such record and any such adjustment previously made in
          respect thereof shall be rescinded and annulled.

                    (iv)   Escrow of Common Stock. If after any property becomes
          distributable as a result of the provisions of this Section 6 by
          reason of the taking of any record of the holders of Common Stock, but
          prior to the occurrence of the event for which such record is taken, a
          holder of shares of Series A Convertible Preferred Stock exercises its
          conversion rights pursuant to Section 5, any Additional Shares of
          Common Stock issuable and other property distributable upon exercise
          by reason of such adjustment shall be held in escrow for such holder
          by the Corporation to be issued to such holder upon and to the extent
          that the event actually takes place. Notwithstanding any other
          provision to the contrary herein, if the event for which such record
          was taken fails to occur or is rescinded, then such escrowed shares
          shall be canceled by the Corporation and escrowed property returned.

                    (v)    Challenge to Good Faith Determination. Whenever the
          Board of Directors shall be required to make a determination in good
          faith of the fair value of any item under this Section 6, such
          determination may be challenged in good faith by a holder of shares of
          Series A Convertible Preferred Stock, and any dispute shall be
          resolved by an investment banking firm of recognized national standing
          selected by the Corporation and acceptable to such holder.

          (h)  Other Action Affecting Common Stock. In case at any time or from
time to time the Corporation shall take any action in respect of its Common
Stock, other than any action described in this Section 6 for which a specific
adjustment is provided, then, unless such action will not have a materially
adverse effect upon the rights of the holders of shares of Series A Convertible
Preferred Stock, the number of shares of Common Stock or other stock into which
such shares of Series A Convertible Preferred Stock are convertible and/or the
applicable Conversion Price shall be adjusted in such manner as may be equitable
in the circumstances.

                                      -17-
<PAGE>

          (i)  Certain Limitations. Notwithstanding anything herein to the
contrary, the Corporation shall not enter into any transaction which, by reason
of any adjustment hereunder, would cause the applicable Conversion Price to be
less than the par value per share of Common Stock.

          (j)  Notice of Adjustments. Whenever the number of shares of Common
Stock into which shares of Series A Convertible Preferred Stock are convertible
or whenever the applicable Conversion Price shall be adjusted pursuant to this
Section 6, the Corporation shall forthwith prepare a certificate to be executed
by the chief financial officer of the Corporation setting forth, in reasonable
detail, the event requiring the adjustment and the method by which such
adjustment was calculated (including a description of the basis on which the
Board of Directors determined the fair value of any consideration referred to in
Section 6(g)(i)), specifying any change in the applicable Conversion Price or
the number of shares of Common Stock into which shares of Series A Convertible
Preferred Stock are convertible and (if such adjustment was made pursuant to
Section 5(g)(i) or 6(h)) describing the number and kind of any other shares of
stock or Other Property into which shares of Series A Convertible Preferred
Stock are convertible, and any change in the applicable Conversion Price or
prices thereof, after giving effect to such adjustment or change. The
Corporation shall promptly cause a signed copy of such certificate to be
delivered to the holders of Series A Convertible Preferred Stock. The
Corporation shall keep at the Payment Office copies of all such certificates and
cause the same to be available for inspection at said office during normal
business hours by the holders of Series A Convertible Preferred Stock or any
prospective purchaser of shares of Series A Convertible Preferred Stock
designated by such holders.

     7.   TRIGGERING EVENTS.

          Any of the following actions or events shall constitute a "Triggering
Event" for purposes hereof:

          (a)  Failure to Pay Dividends. The Corporation shall fail to pay any
dividend on any Series A Convertible Preferred Stock which it is required to pay
in accordance with Section 2 for any reason, including but not limited to, that
such payment is prohibited by applicable law or the Board of Directors elect not
to pay such dividend, or shall otherwise violate any term of Section 2 and such
failure shall not be cured within a period of 30 days after such violation
(which cure shall be effected in a manner ensuring the holders the same yield as
if such violation had not occurred).

          (b)  Failure of Voting Rights. The Corporation shall enter into any
transaction or take any action required to be approved by holders of Series A
Convertible Preferred Stock without obtaining the requisite approval of the
holders of the Series A Convertible Preferred Stock.

          (c)  Failure to Convert. The Corporation shall fail for any reason to
issue Common Stock as required under Section 5 upon the request of any holder of
Series A Convertible Preferred Stock as provided in Section 5 or shall fail for
any reason to comply in any material respect with any term of Section 5(f) or
any other term of Section 5 hereof.

                                      -18-
<PAGE>

          (d)  Registration Rights Agreement. The Corporation shall fail in any
material respect to comply with the rights of the holders of Series A
Convertible Preferred Stock pursuant to the Registration Rights Agreement, dated
as of June 15, 2000, among the Corporation, UBS Capital Americas III, L.P., UBS
Capital LLC and other stockholders of the Corporation, and such failure shall
continue for a period of 30 days after notice from any such holder.

          (e)  Preferred Stock Purchase Agreement. The Corporation shall fail to
comply with Section 3, 6(e) or 6(g) of the Preferred Stock Purchase Agreement
and such failure shall continue for a period of 30 days after notice from the
Purchasers or the representations made under Section 4(c) or 4(u) of the
Preferred Stock Purchase Agreement shall prove to have been incorrect or
misleading in any material respect when made pursuant thereto or any other
material representation made under the Preferred Stock Purchase Agreement shall
prove to have been incorrect or misleading in any substantial material respect
when made.

     8.   REMEDIES.

          (a)  In the event that a Triggering Event described in Section 7 shall
occur and be continuing, each holder of Series A Convertible Preferred Stock
shall be entitled to receive all cash and other dividends, distributions and
other payments which would be paid or payable to a holder of a number of shares
of Common Stock into which the shares of Series A Convertible Preferred Stock
held by such holder are convertible at such time (without regard to the number
of shares of Common Stock which are authorized or reserved for issuance at such
time).

          (b)  Upon the occurrence and during the continuance of any Triggering
Event, the size of the Board of Directors shall immediately be increased by the
minimum number of directors which, if all of such additional directors were
deemed "Series A Preferred Directors," would result in Series A Preferred
Directors constituting a majority of the Board of Directors and the holders of
Series A Convertible Preferred Stock shall be entitled to appoint such newly
created directors, in the manner provided in Section 4(d).

          (c)  Upon the occurrence and during the continuance of any Triggering
Event, any holder of shares of Series A Convertible Preferred Stock, at its
election, may, by notice to the Corporation (the "Put Notice"), demand
repurchase of all or any portion of such holder's shares of Series A Convertible
Preferred Stock for a cash purchase price in an amount per share equal to the
Liquidation Preference. The Corporation shall, on the date (not less than 10
business days after the date of the Put Notice) designated in such Put Notice,
repurchase from the Holder such holder's shares of Series A Convertible
Preferred Stock specified in the Notice. On the date of any repurchase of shares
of Series A Convertible Preferred Stock pursuant to this Section 8(c), the
holder thereof shall surrender for redemption a certificate for the number of
shares of Series A Convertible Preferred Stock being redeemed, without any
representation or warranty (other than that the holder has good and marketable
title thereto, free and clear of liens, encumbrances and restrictions of any
kind), against payment therefor of the repurchase price by, at the option of the
holder, (i) wire transfer to an account designated by the holder for such
purpose or (ii) a certified or official bank check payable to the order of the
holder. If less than all of the holder's shares of Series A Convertible
Preferred Stock represented by a single certificate are being redeemed, the
Corporation shall cancel such certificate and issue in the name of, and deliver
to, the holder a new certificate for the portion not being redeemed. At any time
following delivery

                                      -19-
<PAGE>

of a Put Notice but prior to the date of repurchase, any holder of Series A
Convertible Preferred Stock may, by notice to the Corporation, withdraw the
repurchase demand contained in the Put Notice.

          (d)  The Corporation stipulates that the remedies at law of each
holder of Series A Convertible Preferred Stock in the event of any Triggering
Event or threatened Triggering Event or otherwise or other failure in the
performance of or compliance with any of the terms hereof are not and will not
be adequate and that, to the fullest extent permitted by law, such terms may be
specifically enforced by a decree for the specific performance of any agreement
contained herein or by an injunction against a violation of any of the terms
hereof or otherwise without requiring any holder to post a bond or other
security except to the extent required by applicable law.

          (e)  Any holder of Series A Convertible Preferred Stock shall be
entitled to recover from the Corporation the reasonable attorneys' fees and
expenses incurred by such holder in connection with any Triggering Event or
enforcement by such holder of any obligation of the Corporation hereunder.

          (f)  No failure or delay on the part of any holder of Series A
Convertible Preferred Stock in exercising any right, power or remedy hereunder
or under applicable law or otherwise shall operate as a waiver thereof; nor
shall any single or partial exercise of any such right, power or remedy preclude
any other or further exercise thereof or the exercise of any other right, power
or remedy hereunder or thereunder. The remedies herein provided are cumulative
and not exclusive of any remedies provided by law or otherwise.

     9.   PREEMPTIVE RIGHT.

          (a)  Each holder of Series A Convertible Preferred Stock or Common
Stock issued upon conversion of Series A Convertible Preferred Stock, shall have
a right of first refusal (the "Preemptive Right") to purchase its pro rata
share, based on such holder's percentage ownership interest in the Corporation,
of New Securities (as defined below) which the Corporation, from time to time,
proposes to sell and issue (subject to such requirements and restrictions
imposed by the Securities Act of 1933, as amended, and state securities laws and
to the actual issuance of the New Securities). The pro rata shares of any holder
of Series A Convertible Preferred Stock or Common Stock issued upon conversion
of Series A Convertible Preferred Stock, for purposes of this Preemptive Right,
shall be the ratio of (i) the number of shares of Common Stock owned, of record
or beneficially, by such holder (including all shares issuable upon conversion
of the Series A Convertible Preferred Stock or the exercise or conversion of any
other option, warrant or convertible security held by such holder) immediately
prior to the issuance of the New Securities, to (ii) the total number of shares
of Common Stock issued and outstanding immediately prior to the issuance of the
New Securities, determined on a fully diluted basis after giving effect to the
exercise in full of then outstanding options and warrants and the conversion of
all securities convertible into shares of Common Stock; provided, however, that
if any holder of Series A Convertible Preferred Stock or Common Stock issued
upon conversion of Series A Convertible Preferred Stock does not elect to
purchase its entire pro rata share of such New Securities, then each other
holder that has elected to purchase its entire pro rata share shall have the
right to purchase up to a number of such unpurchased portion, in

                                      -20-
<PAGE>

addition to its own, in the proportion that (1) the number of shares of Common
Stock owned, of record or beneficially, by such holder (including all shares
issuable upon conversion of the Series A Convertible Preferred Stock or the
exercise or conversion of any other option, warrant or convertible security held
by such holder) immediately prior to the issuance of the New Securities bears to
(2) the number of shares of Common Stock owned, of record or beneficially, by
all holders of Series A Convertible Preferred Stock or Common Stock issued upon
conversion of Series A Convertible Preferred Stock (including all shares
issuable upon conversion of the Series A Convertible Preferred Stock or the
exercise or conversion of any other option, warrant or convertible security held
by such holders) immediately prior to the issuance of the New Securities.  The
overallotment mechanism set forth in this paragraph shall be repeatedly applied
until all New Securities available for purchase by holders of Series A
Convertible Preferred Stock or Common Stock issued upon conversion of Series A
Convertible Preferred Stock have been purchased or no holders remain who have
indicated a desire to purchase any unsubscribed for portion in their notice to
the Corporation.

          (b) "New Securities" shall mean (a) any capital stock of the
Corporation, rights, options or warrants to purchase capital stock and
securities of any type whatsoever that are, or may become convertible into or
exchangeable for capital stock and (b) so-called "high yield" bonds, debt
instruments with equity like features or other similar debt instruments, which
bear a rating lower than investment-grade or are unrated, issued by the
Corporation; provided, however, that the term "New Securities" does not include
(i) the issuance of up to 2,460,000 shares of Common Stock issuable pursuant to
the outstanding options to purchase Common Stock under the Stock Option Plan,
(ii) shares of Common Stock issued or issuable in connection with a Qualified
Public Offering, (iii) shares of Common Stock issued upon conversion of Series A
Convertible Preferred Stock, (iv) securities issued as consideration for any
acquisition approved by a majority of the Board of Directors (including the
affirmative vote of the Series A Preferred Directors), (v) the issuance of up to
820,471 shares of Series A Convertible Preferred Stock at the Subsequent Closing
(as defined in the Preferred Stock Purchase Agreement), (vi) the Spinway
Warrant, (vii) 210,000 shares of Common Stock upon exercise of the Spinway
Warrant, or (viii) shares of Common Stock in exchange for shares of common stock
of Tutopia  upon a change-in-control of the Corporation pursuant to the Tutopia
Stockholders Agreement dated as of April 24, 2000.

          (c) In the event the Corporation proposes to undertake an issuance of
New Securities, it shall give each holder of Series A Convertible Preferred
Stock or Common Stock issued upon conversion of Series A Convertible Preferred
Stock written notice of its intention, describing the type of New Securities and
the price and the terms upon which the Corporation proposes to issue the same.
Each such holder shall have twenty (20) business days from the date of receipt
of any such notice to agree to purchase its pro rata share of such New
Securities for the price and upon the terms specified in the notice by giving
written notice to the Corporation and stating therein the quantity of New
Securities to be purchased.

          (d) The Corporation shall have ninety (90) days after expiration of
the twenty (20) business day period described in Section 9(c) to sell any New
Securities with respect to which a Preemptive Right was not exercised, at a
price not less than and upon terms no more favorable in the aggregate to the
purchasers thereof than specified in the Corporation's notice.  To the extent
the Corporation does not sell all the New Securities offered within said ninety
(90)

                                      -21-
<PAGE>

day period, the Corporation shall not thereafter issue or sell such New
Securities without first again offering such securities to each holder of Series
A Convertible Preferred Stock or Common Stock issued upon conversion of Series A
Convertible Preferred Stock in the manner provided above.

          (e) The rights granted under this Section 9 to each holder of Series A
Convertible Preferred Stock or Common Stock issued upon conversion of Series A
Convertible Preferred Stock shall expire upon the earlier of (i) the closing of
a Qualified Public Offering and (ii) such time as the holders of Series A
Convertible Preferred Stock and their Affiliates no longer collectively hold in
the aggregate at least 50% of the number of shares of Series A Convertible
Preferred Stock (including, for this purpose, Common Stock issued upon
conversion of the Series A Convertible Preferred Stock) issued pursuant to the
Preferred Stock Purchase Agreement (as adjusted in connection with the events
described in Section 6) determined after the Subsequent Closing (as defined in
the Preferred Stock Purchase Agreement).

                                      -22-<PAGE>

                                                                     Exhibit 4.2
                                                                     -----------

                         REGISTRATION RIGHTS AGREEMENT

                                     among

                               IFX CORPORATION,

                        UBS CAPITAL AMERICAS III, L.P.,

                               UBS CAPITAL LLC,

                  INTERNATIONAL TECHNOLOGY INVESTMENTS, LLC,

                                      and

                                 LEE S. CASTY

                            dated as June 15, 2000
<PAGE>

                         REGISTRATION RIGHTS AGREEMENT
                         -----------------------------

     THIS REGISTRATION RIGHTS AGREEMENT (this "Agreement") is entered into as of
June 15, 2000, among IFX Corporation, a Delaware corporation (the "Company"),
UBS Capital Americas III, L.P., a Delaware limited partnership, and UBS Capital
LLC, a Delaware limited liability company, (collectively "UBS" and together with
their successors and assigns, the "Investor Stockholders"), INTERNATIONAL
TECHNOLOGY INVESTMENTS, LC, a Nevada limited liability company ("ITI"), and LEE
S. CASTY, individually ("Casty").

                                   RECITALS
                                   --------

     WHEREAS, the Company and the Investor Stockholders have entered into the
IFX Corporation Preferred Stock Purchase Agreement, of even date herewith (the
"Stock Purchase Agreement"), pursuant to which the Investor Stockholders will
purchase shares (the "Preferred Shares") of newly issued Series A Convertible
Preferred Stock, par value $1.00 per share, of the Company ("Series A Preferred
Stock");

     WHEREAS, in connection with the Stock Purchase Agreement, the Company has
agreed to grant the Investor Stockholders the registration rights described
herein;

     WHEREAS, the Company, Emerging Networks, Inc., ITI and Casty were parties
to a Subscription and Joint Venture Agreement, dated as of November 23, 1998, as
amended, providing, inter alia, for registration rights, which Subscription and
                    ----- ----
Joint Venture Agreement is being terminated as of the date hereof; and

     WHEREAS, in connection with the termination of such agreement, the Company
has agreed to grant ITI and Casty the registration rights described herein;

     NOW THEREFORE, the parties hereto, in consideration of the foregoing and
the mutual covenants and agreements hereinafter set forth, hereby agree as
follows:

     1. Certain Definitions.  As used herein, the following terms shall have the
        -------------------
following meanings:

     "Commission" means the Securities and Exchange Commission or any other
federal agency then administering the federal securities laws.

     "Common Shares" means shares of Common Stock held by ITI and Casty and
their permitted assigns under Section 13(b) or the Investor Stockholders.

     "Common Stock" means the common stock, par value $0.02 per share, of the
Company and any securities issued in respect thereof, or in substitution
therefor, in connection with any stock split, dividend or combination, or any
reclassification, recapitalization, merger, consolidation exchange or other
similar reorganization.

     "Conversion Shares" means shares of Common Stock issued or issuable upon
conversion of the Preferred Shares or any other Convertible Securities held by
the Investor Stockholders.
<PAGE>

          "Convertible Securities" shall mean (i) any rights, options or
warrants to acquire Common Stock or any capital stock of the Company or any
Subsidiary, including the shares of Series A Preferred Stock to be issued
hereunder, and (ii) any notes, debentures, shares of preferred stock or other
securities, options, warrants or rights, which are convertible or exercisable
into, or exchangeable for, Common Stock or any capital stock of the Company or
any Subsidiary.

     "Exchange Act" means the Securities Exchange Act of 1934, as amended, or
any similar federal statute, and the rules and regulations promulgated
thereunder.

     "Initial Closing" has the meaning assigned to such term in the Stock
Purchase Agreement.

     "Registration Expenses" means the expenses so described in Section 8.

     "Restricted Stock" means the Conversion Shares and Common Shares, excluding
Conversion Shares and Common Shares which have been (a) registered under the
Securities Act pursuant to an effective registration statement filed thereunder
and disposed of in accordance with the registration statement covering them or
(b) publicly sold pursuant to Rule 144 under the Securities Act.

     "Securities Act" means the Securities Act of 1933, as amended, or any
similar federal statute, and the rules and regulations promulgated thereunder.

     "Selling Expenses" shall mean the expenses so described in Section 8.

     2.   Restrictive Legend.  Each certificate representing Preferred Shares,
          ------------------
Conversion Shares or Common Shares shall, except as otherwise provided in this
Section 2 or in Section 3, be stamped or otherwise imprinted with a legend
substantially in the following form:

          "THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES
          ACT OF 1933 OR ANY STATE SECURITIES LAWS AND MAY NOT BE
          TRANSFERRED OR OTHERWISE DISPOSED OF UNLESS IT HAS BEEN
          REGISTERED UNDER SUCH ACT AND ALL SUCH APPLICABLE LAWS OR AN
          EXEMPTION FROM REGISTRATION IS AVAILABLE."

A certificate shall not bear such legend if in the opinion of counsel
satisfactory to the Company (it being agreed that each of Neal, Gerber &
Eisenberg and Kaye, Scholer, Fierman, Hays & Handler, LLP shall be satisfactory)
the securities represented thereby may be publicly sold without registration
under the Securities Act and any applicable state securities laws.

     3.   Removal of Legend.  Each certificate for Preferred Shares,
          -----------------
Conversion Shares or Common Shares transferred shall bear the legend set forth
in Section 2, except that such certificate shall not bear such legend if (i)
such transfer is in accordance with the provisions of Rule 144 (or any other
rule permitting public sale without registration under the Securities Act) or
(ii) in the opinion of counsel satisfactory to the Company (it being agreed that
either of Neal,

                                       2
<PAGE>

Gerber & Eisenberg or Kaye, Scholer, Fierman, Hays & Handler, LLP shall be
satisfactory) the transferee and any subsequent transferee would be entitled to
transfer such securities in a public sale without registration under the
Securities Act.

     4.   Required Registration.  (a) At any time after the earlier of (i) 180
          ---------------------
days following the consummation of a Qualified Public Offering (as defined in
the Stock Purchase Agreement) and (ii) the first anniversary of the Initial
Closing, the Investor Stockholders holding Restricted Stock constituting at
least 66 2/3% of the total shares of Restricted Stock held by Investor
Stockholders then outstanding, ITI or Casty may request the Company to register
under the Securities Act all or any portion of the shares of Restricted Stock
held by such requesting holder or holders for sale in the manner specified in
such notice, provided that the shares of Restricted Stock for which registration
             --------
has been requested shall have a reasonably anticipated aggregate price to the
public which is at least $15,000,000 (the "Minimum Offering Price"); provided
                                                                     --------
further that neither ITI nor Casty shall request such registration prior to a
-------
Qualified Public Offering without the consent of UBS. The only securities which
the Company shall be required to register pursuant hereto shall be shares of
Common Stock, provided, however, that, in any underwritten public offering
              --------  -------
contemplated by this Section 4 or Sections 5 and 6, the holders of Preferred
Shares shall be entitled to sell such Preferred Shares to the underwriters for
conversion and sale of the shares of Common Stock issued upon conversion
thereof. Notwithstanding anything to the contrary contained herein, the Company
shall not be required to file any registration statement under this Section 4,
within such period of time after the effective date of any earlier registration
statement relating to an underwritten public offering (other than a registration
statement on Form S-3 or any successor thereto relating to the resale of
securities of the Company acquired in connection with an acquisition or similar
transaction (each, an "Acquisition Registration Statement")) as shall be
determined in good faith by the managing underwriter of an underwritten public
offering, provided that such time period shall not exceed 180 days.

     (b)  Following receipt of any notice under this Section 4, the Company
shall immediately notify all holders of Restricted Stock from whom notice has
not been received and shall use its reasonable best efforts to register under
the Securities Act, for public sale in accordance with the method of disposition
specified in such notice from requesting holders, the number of shares of
Restricted Stock specified in such notice (and in all notices received by the
Company from other holders within 30 days after the giving of such notice by the
Company). If such method of disposition shall be an underwritten public
offering, the Company shall designate the underwriter(s) of such offering,
subject to the approval by the holders of a majority of the shares of Restricted
Stock, including the approval of holders of at least 66 2/3% of the shares of
Restricted Stock proposed to be sold by Investor Stockholders, to be sold in
such offering (such approval not to be unreasonably withheld or delayed). If the
managing underwriter advises the Company in writing that in such underwriter's
good faith determination the marketing factors require a limitation of the
amount of Restricted Stock to be underwritten in such registration, the Company
shall (to the extent that the managing underwriter believes that such securities
can be sold in such offering without having an adverse effect upon the marketing
of such offering) register in such registration (i) first, the Restricted Stock
                                                    -----
proposed to be sold by the parties participating in the demand registration of
Restricted Stock under this Section 4, pro rata based upon the number of shares
                                       --- ----
of Restricted Stock proposed to be sold by such holders; provided that until at
least 50% of the Restricted Stock held by the Investor Stockholders determined
on a fully

                                       3
<PAGE>

diluted basis after the Subsequent Closing (as defined in the Stock Purchase
Agreement) is registered and sold, the Investor Stockholders shall be entitled
to have included in any registration under this Section 4 at least 50% of the
Restricted Stock proposed to be included in such registration, and (ii) second
                                                                        ------
securities held by the Company. The Company shall be obligated to register
Restricted Stock pursuant to this Section 4, in the case of registrations
requested by the Investor Stockholders, on two occasions only, and in the case
of each of ITI and Casty on three occasions only, provided, however, that such
                                                  --------  -------
obligation shall be deemed satisfied only when a registration statement covering
all shares of Restricted Stock specified in demand notices delivered pursuant to
Section 4(a), for sale in accordance with the method of disposition specified by
the requesting holders, shall have become effective and, if such method of
disposition is a firm commitment underwritten public offering, all such shares
designated in the notice shall have been sold pursuant thereto.

     (c)  The Company shall, subject to Section 4(b), be entitled to include in
any registration statement referred to in this Section 4 for sale in accordance
with the method of disposition specified by the requesting holders, shares of
Common Stock to be sold by the Company for its own account.

     5.   Incidental Registration.  If the Company at any time (other than
          -----------------------
pursuant to Section 4 or Section 6) proposes to register any of its securities
under the Securities Act for sale to the public, whether for its own account or
for the account of other security holders or both (except with respect to
registration statements on Forms S-4, S-8 or another form not available for
registering the Restricted Stock for sale to the public), each such time it will
give written notice to all holders of outstanding Restricted Stock of its
intention so to do. Upon the written request of any such holder, received by the
Company within 30 days after the giving of any such notice by the Company, to
register any of its Restricted Stock, the Company will use its reasonable best
efforts to cause the Restricted Stock as to which registration shall have been
so requested to be included in the securities to be covered by the registration
statement proposed to be filed by the Company, all to the extent requisite to
permit the sale or other disposition by the holder of such Restricted Stock so
registered. In the event that any registration pursuant to this Section 5 shall
be, in whole or in part, an underwritten public offering of Common Stock, and
the managing underwriter advises the Company in writing that in such
underwriter's good faith determination the marketing factors require a
limitation of the amount of Restricted Stock to be underwritten in such
registration then (a) if such registration is a primary registration on behalf
of the Company, the Company shall (to the extent that the managing underwriter
believes that such securities can be sold in such offering without having an
adverse effect upon the marketing of such offering) register in such
registration (i) first, the Company securities which the Company proposes to
                 -----
sell in such registration, (ii) second, the Restricted Stock held by Investor
                                ------
Stockholders which they propose to sell in such registration on a pro rata basis
                                                                  --- ----
based upon the number of shares of Restricted Stock owned by such holders, (iii)
third, Restricted Stock held by ITI and Casty which they propose to sell in such
-----
registration on a pro rata basis based upon the number of shares of Restricted
                  --- ----
Stock owned by such holders and (iv) fourth, securities held by other parties
                                     ------
eligible for inclusion in such registration statement on a pro rata basis based
                                                           --- ----
upon the amount of securities held by them, and (b) if such registration is a
secondary registration, the Company shall (to the extent that the managing
underwriter believes that such securities can be sold in such offering without
having an adverse effect upon the marketing of such offering) register in such
registration (i) first, the Restricted Stock held by Investor Stockholders which
                 -----

                                       4
<PAGE>

they propose to sell in such registration on a pro rata basis based upon the
                                               --- ----
number of shares of Restricted Stock owned by such holders, (ii) second, the
                                                                 ------
Restricted Stock held by ITI and Casty which they propose to sell in such
registration on a pro rata basis based upon the number of shares of Restricted
                  --- ----
Stock owned by such holders and (iii) third, the securities held by other
                                      -----
parties eligible for inclusion in such registration on a pro rata basis based
                                                         --- ----
upon the amount of securities held by them. Notwithstanding the foregoing
provisions, the Company may withdraw any registration statement referred to in
this Section 5, without thereby incurring any liability to the holders of
Restricted Stock other than for the payment of Registration Expenses in
accordance with Section 8.

     6.   Registration on Form S-3.  If at any time (i) one or more Investor
          ------------------------
Stockholders, ITI or Casty requests that the Company file a registration
statement on Form S-3 or any successor thereto for a public offering of all or
any portion of the shares of Restricted Stock held by such requesting holder or
holders, the reasonably anticipated aggregate price to the public of which would
exceed $2,500,000, provided that the Restricted Stock for which registration has
been requested constitutes at least 10% of the total shares of Restricted Stock
then outstanding held by Investor Stockholders, if such registration is
requested by one or more Investor Stockholders, or at least 10% of the total
shares of Restricted Stock then outstanding held by ITI or Casty, as the case
may be, if such registration is requested by ITI or Casty, and (ii) the Company
is a registrant entitled to use Form S-3 or any successor thereto to register
such shares, then the Company shall use its reasonable best efforts to register
under the Securities Act on Form S-3 or any successor thereto, for public sale
in accordance with the method of disposition specified in such notice, the
number of shares of Restricted Stock specified in such notice.  Whenever the
Company is required by this Section 6 to use its reasonable best efforts to
effect the registration of Restricted Stock, each of the procedures and
requirements of Section 4 (including but not limited to the requirement that the
Company notify all holders of Restricted Stock from whom notice has not been
received and provide them with the opportunity to participate in the offering)
shall apply to such registration, provided, however, that each of the Investor
                                  --------  -------
Stockholders (considered as a group), ITI and Casty may only request and obtain
two registrations on Form S-3 under this Section in any calendar year, provided,
                                                                       --------
further, that no request may be made by a party under this Section 6 within 180
-------
days after the effective date of any other registration statement filed by the
Company pursuant to this Section on behalf of such party, and provided further,
                                                              -------- -------
however, that the requirements contained in Section 4(a) (other than the
-------
requirements as to a Minimum Offering Price) shall apply to any registration on
Form S-3 which may be requested and obtained under this Section 6.

     7.   Registration Procedures.  If and whenever the Company is required by
          -----------------------
the provisions of Sections 4, 5 or 6 to use its reasonable best efforts to
effect the registration of any shares of Restricted Stock under the Securities
Act, the Company will, as expeditiously as possible:

     (a)  prepare and file with the Commission a registration statement (which,
other than in the case of an underwritten public offering pursuant to Section 4,
may be on Form S-3 or any successor thereto if the Company is a registrant
entitled to use such Form) with respect to such securities and use its
reasonable best efforts to cause such registration statement to become and
remain effective for the period of the distribution contemplated thereby
(determined as hereinafter provided);

                                       5
<PAGE>

     (b)  prepare and file with the Commission such amendments and supplements
to such registration statement and the prospectus used in connection therewith
as may be necessary to keep such registration statement effective for the period
specified in paragraph (a) above and comply with the provisions of the
Securities Act with respect to the disposition of all Restricted Stock covered
by such registration statement in accordance with the sellers' intended method
of disposition set forth in such registration statement for such period;

     (c)  furnish to each seller of Restricted Stock and to each underwriter
such number of copies of the registration statement and the prospectus included
therein (including each preliminary prospectus) as such persons reasonably may
request in order to facilitate the public sale or other disposition of the
Restricted Stock covered by such registration statement;

     (d)  use its reasonable best efforts to register or qualify the Restricted
Stock covered by such registration statement under the securities or "blue sky"
laws of such jurisdictions as the sellers of Restricted Stock or, in the case of
an underwritten public offering, the managing underwriter reasonably shall
request, provided, however, that the Company shall not for any such purpose be
         --------  -------
required to qualify generally to transact business as a foreign corporation in
any jurisdiction where it is not so qualified or to consent to general service
of process in any such jurisdiction;

     (e)  list the Restricted Stock covered by such registration statement with
any securities exchange on which the Common Stock of the Company is then listed;

     (f)  immediately notify each seller of Restricted Stock and each
underwriter under such registration statement, at any time when a prospectus
relating thereto is required to be delivered under the Securities Act, of the
happening of any event of which the Company has knowledge as a result of which
the prospectus contained in such registration statement, as then in effect,
includes an untrue statement of a material fact or omits to state a material
fact required to be stated therein or necessary to make the statements therein
not misleading in light of the circumstances then existing;

     (g)  as soon as practicable upon the occurrence of any event contemplated
by Section 7(f), prepare and file a supplement or post-effective amendment to
such registration statement or the prospectus contained in such registration
statement, or any document incorporated therein by reference, or file any other
required document so that, as thereafter delivered to the purchasers of the
shares of Restricted Stock covered thereby, the prospectus contained in such
registration statement will not contain any untrue statement of a material fact
or omit to state a material fact necessary to make the statements therein, in
the light of the circumstances under which they were made, not misleading;
provided, however, that the obligation to prepare and file any such supplement,
--------  -------
post-effective amendment or other document shall be suspended (a "Suspension")
if the Company shall furnish to the holders a certificate signed by the
President of the Company stating that in the good faith judgment of the Board of
Directors of the Company, it would be seriously detrimental to the Company and
its stockholders for such registration to be effected at such time due to any
pending material financing, acquisition or corporate reorganization or other
material corporate development involving the Company or any of its subsidiaries;
provided further, that the Company shall only be permitted to effectuate one (1)
-------- -------
Suspension in any twelve

                                       6
<PAGE>

(12) month period and any such suspension will be lifted by the Company as soon
as practicable and will not, in any event, extend for more than 60 days with
respect to any such specified event;

     (h)  if the offering is underwritten and at the request of any seller of
Restricted Stock, use its reasonable best efforts to furnish on the date that
Restricted Stock is delivered to the underwriters for sale pursuant to such
registration: (i) an opinion dated such date of counsel representing the Company
for the purposes of such registration, addressed to the underwriters and to such
seller, stating that such registration statement has become effective under the
Securities Act and that (A) to the best knowledge of such counsel, no stop order
suspending the effectiveness thereof has been issued and no proceedings for that
purpose have been instituted or are pending or contemplated under the Securities
Act, (B) the registration statement, the related prospectus and each amendment
or supplement thereof comply as to form in all material respects with the
requirements of the Securities Act (except that such counsel need not express
any opinion as to financial statements contained therein) and (C) to such other
effects as reasonably may be requested by counsel for the underwriters or by
such seller or its counsel and (ii) a letter dated such date from the
independent public accountants retained by the Company, addressed to the
underwriters and to such seller, stating that they are independent public
accountants within the meaning of the Securities Act and that, in the opinion of
such accountants, the financial statements of the Company included in the
registration statement or the prospectus, or any amendment or supplement
thereof, comply as to form in all material respects with the applicable
accounting requirements of the Securities Act, and such letter shall
additionally cover such other financial matters (including information as to the
period ending no more than five business days prior to the date of such letter)
with respect to such registration as such underwriters reasonably may request;
and
     (i)  make available for inspection by each seller of Restricted Stock, any
underwriter participating in any distribution pursuant to such registration
statement, and any attorney, accountant or other agent retained by such seller
or underwriter, all financial and other records, pertinent corporate documents
and properties of the Company, and cause the Company's officers, directors and
employees to supply all information reasonably requested by any such seller,
underwriter, attorney, accountant or agent in connection with such registration
statement.

     Upon receipt of any notice from the Company of any event of the kind
described in Section 7.3(f), each seller of Restricted Stock (x) promptly will
discontinue disposition of any shares of Restricted Stock pursuant to such
registration statement until such seller of Restricted Stock has received copies
of the supplemented or amended prospectus contemplated by Section 7(g) (it being
understood that such discontinuance shall be deemed a Suspension subject to the
limitations on Suspensions set forth in Section 7(g)), (y) thereafter, will
utilize and distribute only such supplemented or amended prospectus, and (z) if
so directed by the Company, will deliver to the Company all copies of the
prospectus covering such shares of Restricted Stock in such party's possession
at the time of receipt of such suspension notice.

     For purposes of Section 7(a) and 7(b), the period of distribution of
Restricted Stock in a firm commitment underwritten public offering shall be
deemed to extend until each underwriter has completed the distribution of all
securities purchased by it, and the period of distribution of Restricted Stock
in any other registration shall be deemed to extend until the earlier of the
sale of all Restricted Stock covered thereby and 180 days following
effectiveness of registration.

                                       7
<PAGE>

     In connection with each registration hereunder, each seller of Restricted
Stock will furnish to the Company in writing such information with respect to
itself and the proposed distribution by it as reasonably shall be necessary in
order to assure compliance with federal and applicable state securities laws,
and will notify the Company promptly upon the happening of any event during the
period any registration statement is effective that makes any statement
regarding such seller made in a registration statement or the prospectus
contained therein untrue in any material respect or which requires the making of
any changes in a registration statement or the prospectus contained therein in
order to make the statements therein regarding such seller, in light of
circumstances under which they were made, not misleading.

     In connection with each registration pursuant to Sections 4, 5 or 6
covering an underwritten public offering, the Company and each seller agree to
enter into a written agreement with the managing underwriter selected in the
manner herein provided in such form and containing such provisions as are
customary in the securities business for such an arrangement between such
underwriter and companies of the Company's size and investment stature.

     8.   Expenses. All expenses incurred by the Company in complying with
          --------
Sections 4, 5 and 6, including, without limitation, all registration and filing
fees, printing expenses, fees and disbursements of counsel and independent
public accountants for the Company, fees and expenses (including counsel fees)
incurred in connection with complying with state securities or "blue sky" laws,
fees of the National Association of Securities Dealers, Inc., transfer taxes,
fees of transfer agents and registrars, costs of insurance and reasonable fees
and disbursements of one counsel for the sellers of Restricted Stock, but
excluding any Selling Expenses, are called "Registration Expenses". If ITI
and/or Casty are the only parties (other than the Company) selling Restricted
Stock pursuant to a registration statement described herein, "Registration
Expenses" shall not include the fees and disbursements of counsel for such
sellers of Restricted Stock. All underwriting discounts and selling commissions
applicable to the sale of Restricted Stock are called "Selling Expenses".

     The Company will pay all Registration Expenses in connection with each
registration statement under Sections 4, 5 or 6.

     9.   Indemnification and Contribution. (a) In the event of a registration
          --------------------------------
of any of the Restricted Stock under the Securities Act pursuant to Sections 4,
5 or 6, the Company will indemnify and hold harmless each seller of such
Restricted Stock thereunder, each underwriter of such Restricted Stock
thereunder and each of their respective officers, directors, employees,
partners, agents or other person, if any, who controls such seller or
underwriter within the meaning of the Securities Act, against any losses,
claims, damages or liabilities, joint or several, to which such seller,
underwriter or controlling person may become subject under the Securities Act or
otherwise, insofar as such losses, claims, damages or liabilities (or actions in
respect thereof) arise out of or are based upon any untrue statement or alleged
untrue statement of any material fact contained in any registration statement
under which such Restricted Stock was registered under the Securities Act
pursuant to Sections 4, 5 or 6, any preliminary prospectus or final prospectus
contained therein, or any amendment or supplement thereof, or arise out of or
are based upon the omission or alleged omission to state therein a material fact
required to be stated therein or necessary to make the statements therein not
misleading, and will reimburse

                                       8
<PAGE>

each such seller, each such underwriter and each such controlling person for any
legal or other expenses reasonably incurred by them in connection with
investigating or defending any such loss, claim, damage, liability or action,
provided, however, that the Company will not be liable in any such case if and
--------  -------
to the extent that any such loss, claim, damage or liability arises out of or is
based upon an untrue statement or alleged untrue statement or omission or
alleged omission so made in conformity with information furnished by any such
seller, any such underwriter or any such controlling person in writing
specifically for use in such registration statement or prospectus and, provided
                                                                       --------
further, however, that the Company will not be liable to any such person or
-------  -------
entity with respect to any such untrue statement or omission or alleged untrue
statement or omission made in any preliminary prospectus that is corrected in
the final prospectus filed with the Commission pursuant to Rule 424(b)
promulgated under the Securities Act (or any amendment or supplement to such
prospectus) if the person asserting any such loss, claim, damage or liability
purchased securities but was not given a copy of the final prospectus (as
amended or supplemented) at or prior to the written confirmation of the sale of
such securities to such person in any case where such delivery of the final
prospectus (as amended or supplemented) is required by the Securities Act,
unless such failure to deliver the final prospectus (as amended or supplemented)
was a result of the Company's failure to provide such prospectus (as amended or
supplemented).

     (b)  In the event of a registration of any of the Restricted Stock under
the Securities Act pursuant to Sections 4, 5 or 6, each seller of such
Restricted Stock thereunder, severally and not jointly, will indemnify and hold
harmless the Company, each person, if any, who controls the Company within the
meaning of the Securities Act, each officer of the Company who signs the
registration statement, each director of the Company, each underwriter and each
person who controls any underwriter within the meaning of the Securities Act,
against all losses, claims, damages or liabilities, joint or several, to which
the Company or such officer, director, underwriter or controlling person may
become subject under the Securities Act or otherwise, insofar as such losses,
claims, damages or liabilities (or actions in respect thereof) arise out of or
are based upon any untrue statement or alleged untrue statement of any material
fact contained in the registration statement under which such Restricted Stock
was registered under the Securities Act pursuant to Sections 4, 5 or 6, any
preliminary prospectus or final prospectus contained therein, or any amendment
or supplement thereof, or arise out of or are based upon the omission or alleged
omission to state therein a material fact required to be stated therein or
necessary to make the statements therein not misleading, and will reimburse the
Company and each such officer, director, underwriter and controlling person for
any legal or other expenses reasonably incurred by them in connection with
investigating or defending any such loss, claim, damage, liability or action,
provided, however, that such seller will be liable hereunder in any such case if
--------  -------
and only to the extent that any such loss, claim, damage or liability arises out
of or is based upon an untrue statement or alleged untrue statement or omission
or alleged omission made in reliance upon and in conformity with information
pertaining to such seller, as such, furnished in writing to the Company by such
seller specifically for use in such registration statement or prospectus, and
provided, further, however, that the liability of each seller hereunder shall be
--------  -------  -------
limited to the proportion of any such loss, claim, damage, liability or expense
which is equal to the proportion that the public offering price of the shares
sold by such seller under such registration statement bears to the total public
offering price of all securities sold thereunder, but not in any event to exceed
the net proceeds received by such seller from the sale of Restricted Stock
covered by such registration statement.

                                       9
<PAGE>

     (c)  Promptly after receipt by an indemnified party hereunder of notice of
the commencement of any action, such indemnified party shall, if a claim in
respect thereof is to be made against the indemnifying party hereunder, notify
the indemnifying party in writing thereof, but the omission so to notify the
indemnifying party shall not relieve it from any liability which it may have to
such indemnified party other than under this Section 9 and shall only relieve it
from any liability which it may have to such indemnified party under this
Section 9 if and to the extent the indemnifying party is prejudiced by such
omission.  In case any such action shall be brought against any indemnified
party and it shall notify the indemnifying party of the commencement thereof,
the indemnifying party shall be entitled to participate in and, to the extent it
shall wish, to assume and undertake the defense thereof with counsel
satisfactory to such indemnified party, and, after notice from the indemnifying
party to such indemnified party of its election so to assume and undertake the
defense thereof, the indemnifying party shall not be liable to such indemnified
party under this Section 9 for any legal expenses subsequently incurred by such
indemnified party in connection with the defense thereof other than reasonable
costs of investigation and of liaison with counsel so selected, provided,
                                                                --------
however, that, if the defendants in any such action include both the indemnified
-------
party and the indemnifying party and the indemnified party shall have reasonably
concluded, based on advice of counsel, that there may be reasonable defenses
available to it which are different from or additional to those available to the
indemnifying party or if the interests of the indemnified party reasonably may
be deemed to conflict with the interests of the indemnifying party, the
indemnified party shall have the right to select a separate counsel and to
assume such legal defenses and otherwise to participate in the defense of such
action, with the reasonable expenses and fees of such separate counsel and other
reasonable expenses related to such participation to be reimbursed by the
indemnifying party as incurred.

     (d)  In order to provide for just and equitable contribution in
circumstances in which the indemnity agreement provided for in Sections 9(a) and
9(b) above is for any reason held to be unenforceable by the indemnified party
although applicable in accordance with its terms, the Company and each holder of
Restricted Stock exercising rights under this Agreement shall contribute to the
aggregate losses, claims, damages and liabilities of the nature contemplated by
such indemnity agreement incurred by the Company and such holder, (i) in such
proportion as is appropriate to reflect the relative fault of the Company on the
one hand and such holder on the other, in connection with the statements or
omissions which resulted in such losses, claims, damages or liabilities or (ii)
if the allocation provided by clause (i) above is not permitted by applicable
law, in such proportion as is appropriate to reflect not only the relative fault
of, but also the relative benefits to, the Company on the one hand and such
holder on the other, in connection with the statements or omissions which
resulted in such losses, claims, damages or liabilities, as well as any other
relevant equitable considerations.  The relative benefits to the indemnifying
party and indemnified party shall be determined by reference to, among other
things, the gross proceeds received by the indemnifying party and indemnified
party in connection with the offering to which such losses, claims, damages or
liabilities relate.  The relative fault of the indemnifying party and
indemnified party shall be determined by reference to, among other things,
whether the action in question, including any untrue or alleged untrue statement
of a material fact or omission or alleged omission to state a material fact, has
been made by, or relates to information supplied by, the indemnifying party or
the indemnified party, and the parties' relative intent, knowledge, access to
information and opportunity to correct or prevent such action.  The parties
hereto agree that it would not be just or equitable if contribution

                                      10
<PAGE>

pursuant to this Section 9(d) were determined by pro rata allocation or by any
other method of allocation which does not take account of the equitable
considerations referred to in the immediately preceding sentence.
Notwithstanding the provisions of this Section 9(d), each holder of Restricted
Stock exercising rights under this Agreement shall not be required to contribute
any amount in excess of the amount of the gross proceeds to such holder from
sales of the Restricted Stock of such holder under a registration statement.

     Notwithstanding the foregoing, no person guilty of fraudulent
misrepresentation (within the meaning of Section 11(f) of the Securities Act)
shall be entitled to contribution from any person who was not guilty of such
fraudulent misrepresentation.  For purposes of this Section 9(d), each person,
if any, who controls a holder of Restricted Stock within the meaning of Section
15 of the Securities Act shall have the same rights to contribution as such
holder, and each director of the Company, each officer of the Company who signed
a registration statement and each person, if any, who controls the Company
within the meaning of Section 15 of the Act shall have the same rights to
contribution as the Company.

     10.  Changes in Common Stock or Preferred Stock. If, and as often as, there
          ------------------------------------------
is any change in the Common Stock or the Preferred Stock by way of a stock
split, stock dividend, combination or reclassification, or through a merger,
consolidation, reorganization or recapitalization, or by any other means,
appropriate adjustment shall be made in the provisions hereof so that the rights
and privileges granted hereby shall continue with respect to the Common Stock or
the Preferred Stock as so changed.

     11.  Rule 144 Reporting.  With a view to making available the benefits of
          ------------------
certain rules and regulations of the Commission which may at any time permit the
sale of the Restricted Stock to the public without registration, the Company
agrees to:

     (a)  make and keep public information available, as those terms are
understood and defined in Rule 144 under the Securities Act;

     (b)  use its reasonable best efforts to file with the Commission in a
timely manner all reports and other documents required of the Company under the
Securities Act and the Exchange Act; and

     (c)  furnish to each holder of Restricted Stock forthwith upon request a
written statement by the Company as to its compliance with the reporting
requirements of such Rule 144 and of the Securities Act and the Exchange Act, a
copy of the most recent annual or quarterly report of the Company, and such
other reports and documents so filed by the Company as such holder may
reasonably request in availing itself of any rule or regulation of the
Commission allowing such holder to sell any Restricted Stock without
registration.

     12.  Representations and Warranties of the Company.  The Company
          ---------------------------------------------
represents and warrants to the Investor Stockholders, ITI and Casty as follows:

     (a)  The execution, delivery and performance of this Agreement by the
Company have been duly authorized by all requisite corporate action on its part
and will not violate any provision of law, any order of any court or other
agency of government, the Certificate of Incorporation or By-laws each, as
amended, of the Company or any provision of any indenture,

                                      11
<PAGE>

agreement or other instrument to which it or any or its properties or assets is
bound, conflict with, result in a breach of or constitute (with due notice or
lapse of time or both) a default under any such indenture, agreement or other
instrument or result in the creation or imposition of any lien, charge or
encumbrance of any nature whatsoever upon any of the properties or assets of the
Company, except where the foregoing would not reasonably be expected to have a
material adverse effect on the Company or its business.

     (b)  This Agreement has been duly executed and delivered by the Company and
constitutes the legal, valid and binding obligation of the Company, enforceable
against the Company in accordance with its terms.

     13.  Miscellaneous.

     (a)  Except as otherwise provided herein, no modification, amendment or
waiver of any provision of this Agreement shall be effective against the Company
or any other party unless such modification, amendment or waiver is approved in
writing by the Company and the holders of at least 66 2/3% of the outstanding
shares of Restricted Stock held by each of the Investor Stockholders, ITI and
Casty, provided that any modification, amendment or waiver which would adversely
       --------
affect any party hereto in a manner which is different from the manner the other
parties hereto are affected shall also require the approval of such party. The
failure of any party to enforce any of the provisions of this Agreement shall in
no way be construed as a waiver of such provisions and shall not affect the
right of such party thereafter to enforce each and every provision of this
Agreement in accordance with its terms.

     (b)  This Agreement shall bind and inure to the benefit of and be
enforceable by the parties hereto and their respective heirs, personal
representatives, successors and permitted assigns. This Agreement and the rights
of the parties hereunder may not be assigned by any party hereto without the
prior written consent of the other parties, except as otherwise provided herein.
The Investor Stockholders may assign their rights and obligations hereunder to a
transferee of Restricted Stock, provided that such transferees agree in writing
                                --------
to be bound by the provisions of this Agreement. ITI and Casty may assign their
rights and obligations hereunder to a transferee of Restricted Stock, provided
that each such transferee of ITI and Casty and any subsequent transferee shall,
together with ITI or Casty, as the case may be, be deemed one person for
purposes of this Agreement, and any right or notice hereunder on behalf of such
person may only be delivered by ITI or by Casty (personally, or through his
personal representatives) and, provided, further, that ITI or Casty, as the case
                               --------  -------
may be, shall provide notice of any such assignment to the other parties hereto,
and any such transferee must agree in writing to be bound by the provisions of
this Agreement.

     (c)  All notices required or permitted hereunder shall be in writing and
shall be deemed effectively given: (i) upon personal delivery to the party to be
notified; (ii) when sent by confirmed facsimile if sent during normal business
hours of the recipient, if not, then on the next business day; (iii) five days
after having been sent by registered or certified mail, return receipt
requested, postage prepaid; or (iv) one business day after deposit with a
nationally recognized overnight courier, specifying next day delivery, with
written verification of receipt. All communications shall be sent, with respect
to the Company and the Investor Stockholders, to their respective addresses
specified in the Stock Purchase Agreement (or at such other address as

                                      12
<PAGE>

any such party may specify by like notice) and, with respect to any other party,
to the address of such party as shown in the stock record books of the Company
(or at such other address as any such party may specify to all of the above by
like notice).

     (d)  Except as otherwise expressly set forth herein, this document, the
Stock Purchase Agreement, the Certificate (as defined in the Stock Purchase
Agreement) and the Stockholders Agreement embody the complete agreement and
understanding among the parties hereto with respect to the subject matter hereof
and supersede and preempt any prior understandings, agreements or
representations by or among the parties, written or oral, that may have related
to the subject matter hereof in any way.

     (e)  This Agreement shall be governed by and construed and enforced in
accordance with the internal laws of the State of New York without regard to the
principles of conflicts of law thereof. Each party hereto hereby irrevocably
submits to the nonexclusive jurisdiction of the courts of the state of New York
and of the United States of America sitting in the City of New York, Borough of
Manhattan, for the adjudication of any dispute hereunder or in connection
herewith or with any transaction contemplated hereby or discussed herein, and
hereby irrevocably waives, and agrees not to assert in any suit, action or
proceeding, any claim that it is not personally subject to the jurisdiction of
any such court, that the venue thereof may not be appropriate, that such suit,
action or proceeding is improper or that this Agreement or any of the documents
referred to in this Agreement may not be enforced in or by said courts, and each
party hereto irrevocably agrees that all claims with respect to such suit,
action or proceeding may be heard and determined in such a New York state or
federal court. Each party hereby irrevocably waives personal service of process
and consents to process being served in any such suit, action or proceeding by
mailing a copy thereof to such party in the manner provided in Section 12(b) of
the Stock Purchase Agreement and agrees that such service shall constitute good
and sufficient service of process and notice thereof. Nothing contained herein
shall be deemed to limit in any way any right to serve process in any manner
permitted by law. EACH PARTY HEREBY IRREVOCABLY WAIVES ANY RIGHT IT MAY HAVE,
AND AGREES NOT TO REQUEST, A JURY TRIAL FOR THE ADJUDICATION OF ANY DISPUTE
HEREUNDER OR IN CONNECTION HEREWITH OR ARISING OUT OF THIS AGREEMENT OR ANY
TRANSACTION CONTEMPLATED HEREBY.

     (f)  The obligations of the Company to register shares of Restricted Stock
under Section 4, 5 or 6 shall terminate at the time at which all Restricted
Securities are eligible for resale pursuant to Rule 144(k) under the Securities
Act.

     (g)  If requested in writing by the Company and the underwriters for an
underwritten public offering of securities of the Company, each holder of
Restricted Stock who is a party to this Agreement shall agree not to sell
publicly any shares of Restricted Stock or any other shares of Common Stock
(other than shares of Restricted Stock or other shares of Common Stock being
registered in such offering), without the consent of the Company and such
underwriters, for such period requested by the underwriters (not to exceed 180
days) following the effective date of the registration statement relating to the
Qualified Public Offering (as defined in the Stock Purchase Agreement) or 90
days following the effective date of a registration statement relating to any
other offering; provided, however, that all persons entitled to registration
                --------  -------
rights with respect to shares of Common Stock who are not parties to this
Agreement, all persons holding 5% or more

                                      13
<PAGE>

of the capital stock of the Company on a fully diluted basis and all executive
officers and directors of the Company shall also have agreed not to sell
publicly their Common Stock under the circumstances and pursuant to the terms
set forth in this Section 13(g).

     (h)  Notwithstanding the provisions of Section 7(a), the Company's
obligation to file a registration statement, or cause such registration
statement to become and remain effective, shall be suspended for a period not to
exceed 90 days in any 12-month period if the Company shall furnish to the
holders a certificate signed by the President of the Company stating that in the
good faith judgment of the Board of Directors of the Company, it would be
seriously detrimental to the Company and its stockholders for such registration
to be effected at such time due to any pending material financing, acquisition
or corporate reorganization or other material corporate development involving
the Company or any of its subsidiaries; provided, however, that any suspension
                                        --------  -------
effectuated by the Company under this Section 13(h) shall be deemed a Suspension
subject to the limitation on the number of Suspensions permitted in any twelve
month period under Section 7(g) hereof.

     (i)  The Company shall not grant to any third party any registration rights
more favorable than or inconsistent with any of those contained herein, so long
as any of the registration rights under this Agreement remains in effect.

     (j)  Whenever possible, each provision of this Agreement shall be
interpreted in such manner as to be effective and valid under applicable law,
but if any provision of this Agreement is held to be invalid, illegal or
unenforceable in any respect under any applicable law or rule in any
jurisdiction, such invalidity, illegality or unenforceability shall not affect
any other provision or any other jurisdiction, but this Agreement shall be
reformed, construed and enforced in such jurisdiction as if such invalid,
illegal or unenforceable provision had never been contained herein.

     (k)  The titles of the sections and subsections of this Agreement are for
convenience of reference only and are not to be considered in construing this
Agreement.

     (l)  This Agreement may be executed in any number of counterparts, each of
which shall be an original, but all of which together shall constitute one
instrument. This Agreement may be executed by facsimile signature(s).

                                      14
<PAGE>

     IN WITNESS WHEREOF, the parties have executed this REGISTRATION RIGHTS
AGREEMENT as of the date set forth in the first paragraph hereof.

                                    IFX CORPORATION

                                    By:/s/ Joel Eidelstein
                                       --------------------------------------
                                       Name:  Joel Eidelstein
                                       Title: President

                                    UBS CAPITAL AMERICAS III, L.P
                                    By: UBS Capital Americas (LA-Advisors), LLC

                                    By:/s/ Charles W. Moore
                                       --------------------------------------
                                       Name:  Charles W. Moore
                                       Title: Principal

                                    By:/s/ Marc Unger
                                       --------------------------------------
                                       Name:  Marc Unger
                                       Title: Chief Financial Officer

                                    UBS CAPITAL LLC

                                    By:/s/ George Duarte
                                       --------------------------------------
                                       Name:  George Duarte
                                       Title: Attorney-in-Fact

                                    By:/s/ Marc Unger
                                       --------------------------------------
                                       Name:  Marc Unger
                                       Title: Attorney-in-Fact

                                    INTERNATIONAL TECHNOLOGIES
                                      INVESTMENTS, LLC

                                    By:/s/ Michael Shalom
                                       --------------------------------------
                                       Name:  Michael Shalom
                                       Title: Manager

                                       /s/ Lee S. Casty
                                       --------------------------------------
                                       Lee S. Casty

                                      15

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