Document:

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                                   [ATI LOGO]

                        ADVANCED TELECOMMUNICATIONS, INC.

                              ISSUANCE AND SALE OF
                            SERIES Cl PREFERRED STOCK

                                DECEMBER 13, 1999

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                                 AMENDMENT NO. 1

                                       TO

                   SERIES C PREFERRED STOCK PURCHASE AGREEMENT

     This Amendment No. 1 to Series C Preferred Stock Purchase Agreement (the
"AMENDMENT") is made as of December 13, 1999 by and among:

     (i)    Advanced Telecommunications, Inc., a Delaware corporation (the
            "Company");

     (ii)   Stolberg, Meehan & Scano II, L.P. ("Stolberg");

     (iii)  Bain Capital Fund VI, L.P. ("Bain") and the other Persons who are
            listed on the signature pages hereto as Bain Purchasers (the "BAIN
            PURCHASERS");

     (iv)   J.P. Morgan Ventures Corporation ("JP Morgan");

     (v)    Mount Washington Associates L.L.C. ("MOUNT WASHINGTON");

     (vi)   Steven M. Simon ("Simon");

     (vii)  Paul Cady ("P._Cady");

     (viii) Daniel P. Cady and Jane Maland Cady ("D. Cady"); and

     (ix)   David G. Cady and Kim S. Cady ("DG Cady").

                                    RECITALS

     1. The Bain Purchasers, Stolberg, JP Morgan, Mount Washington, Simon, P.
Cady, D. Cady and DG Cady (collectively, the "SUBSEQUENT PURCHASERS") have
agreed to purchase shares of the Company's Series Cl Preferred Stock, par value
$0.01 per share (the "SERIES Cl PREFERRED STOCK") on the conditions and subject
to the terms set forth in the Series C Preferred Stock Purchase Agreement dated
September 30, 1999 by and among the Company, the Bain Purchasers, Stolberg and
certain other Purchasers (the "STOCK PURCHASE AGREEMENT"), as amended by this
Amendment.

     2. The Company and the Majority Purchasers, which includes the Majority
Bain Purchasers and Stolberg, desire to amend the Stock Purchase Agreement to
include JP Morgan, Mount Washington, Simon, P. Cady, D. Cady and DG Cady as
parties thereto and to include the Series Cl Preferred Stock as Shares
thereunder. Capitalized terms used herein and not otherwise defined herein shall
have the meanings ascribed to them in the Stock Purchase Agreement.

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                                    AGREEMENT

     Therefore, the parties hereto hereby agree as follows:

     1. All references in the Stock Purchase Agreement and this Amendment to the
"STOCK PURCHASE AGREEMENT" or the "AGREEMENT" shall be deemed to mean the Stock
Purchase Agreement, as amended by this Amendment.

     2. The defined term "SHARES" in the Stock Purchase Agreement shall be
deemed to include the shares of Series Cl Preferred Stock sold to the Subsequent
Purchasers pursuant to the Stock Purchase Agreement.

     3. The defined term "STOCKHOLDERS AGREEMENT" shall be deemed to mean the
Stockholders Agreement, as amended by Amendment No. 1 to Amended and Restated
Stockholders Agreement dated as of the date hereof by and among the Company, the
Bain Purchasers, Stolberg and certain other stockholders of the Company (the
"AMENDMENT TO STOCKHOLDERS AGREEMENT").

     4. Section 1.3 of the Stock Purchase Agreement is hereby amended by
replacing it in its entirety with the following:

          "1.3. SALE OF SHARES AT SUBSEQUENT CLOSINGS.

               1.3.1 SALE OF SHARES AT FIRST SUBSEQUENT CLOSING. The Company
          shall adopt and file with the Secretary of State of Delaware on or
          prior to the closing of the purchase of Series Cl Preferred Stock
          hereunder on December 13, 1999 (the "FIRST SUBSEQUENT CLOSING") a
          Second Amended and Restated Certificate of Incorporation in the form
          attached hereto as EXHIBIT L (the "SECOND AMENDED CHARTER").
          Subject to the terms and conditions contained herein, and based on the
          representations and warranties contained herein, each Subsequent
          Purchaser agrees, severally, to purchase, and the Company agrees to
          issue and sell to each Subsequent Purchaser on January 4, 2000, that
          number of shares of Series Cl Preferred Stock set forth in the column
          First Subsequent Closing opposite each Subsequent Purchaser's name on
          EXHIBIT A hereto at the per share purchase price of $6.00 (the "FIRST
          SUBSEQUENT PURCHASE PRICE").

               1.3.2 SALE OF SHARES AT OTHER SUBSEQUENT CLOSINGS. Subject to all
          of the terms and conditions of this Agreement and based on the
          representations and warranties contained herein, at any time after
          March 31, 2000 and prior to September 30, 2001, at the option of the
          Company and upon not less than ten Business Days prior written notice
          to the Bain Purchasers, the Bain Purchasers will purchase at not more
          than three subsequent closings (each, together with the First
          Subsequent Closing, a "SUBSEQUENT CLOSING") at a per share purchase
          price of $5.00 (or such other per share purchase price

                                      -2-
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          as shall be agreed to in writing by the Majority Bain Purchasers and a
          majority of the disinterested members of the Company's board of
          directors) a number of Shares not exceeding 6,000,000 shares; PROVIDED
          that in addition to the conditions set forth in Section 4.4 hereof,
          the following conditions have been met: (a) the Company shall have
          achieved the operational and financial targets set forth on EXHIBIT C
          hereto and (b) the CLEC Basket Market Value shall be greater than
          11.2, as calculated on EXHIBIT D hereto (the "BASE MARKET VALUE");
          PROVIDED, HOWEVER that in the event that one or more of the Designated
          CLECs ceases to be a publicly traded company trading under the ticker
          symbol under which it is trading as of Initial Closing, the Base
          Market Value shall be recalculated in good faith to exclude such
          Designated CLEC from the calculation."

     5. Section 4.4 of the Stock Purchase Agreement is hereby amended by
renumbering it as Section 4.5.

     6. Section 4.3 of the Stock Purchase Agreement is hereby amended by
replacing it in its entirety with the following:

               "4.3. FIRST SUBSEQUENT CLOSING. The obligations of each of the
          Subsequent Purchasers under Section 1 of this Agreement to purchase
          Shares at the First Subsequent Closing are subject to the fulfillment
          on or before the First Subsequent Closing of each of the following
          conditions unless waived in accordance with Section 8.1:

                    4.3.1. REPRESENTATIONS AND WARRANTIES. The representations
               and warranties of the Company contained in Section 2, as amended
               by the amended Schedules attached hereto as EXHIBIT M (the
               "AMENDED SCHEDULES"), shall be true and correct in all material
               respects on and as of the date of the First Subsequent Closing
               with the same effect as though such representations and
               warranties had been made on and as of the date of such First
               Subsequent Closing and the Subsequent Purchasers shall have
               received a certificate of the Chief Executive Officer or Chief
               Operating Officer of the Company to that effect.

                    4.3.2 PERFORMANCE. The Company shall have performed and
               complied with all agreements, obligations, and conditions
               contained in this Agreement and the Stockholders Agreement that
               are required to be performed or complied with by it on or before
               the First Subsequent Closing.

                    4.3.3 BOARD DETERMINATIONS. The board of directors of the
               Company shall have approved all issuances of Shares at the First
               Subsequent Closing and determined that the financing to be
               provided by the issuance and sale of Shares at the First
               Subsequent Closing is necessary or desirable in connection with
               the funding of the business of the Company and its Subsidiaries.

                                      -3-
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                    4.3.4 FILING OF SECOND AMENDED CHARTER. The Company shall
               have filed with the Secretary of State of Delaware the Second
               Amended Charter in the form attached hereto as EXHIBIT L and the
               Second Amended Charter shall have become effective.

                    4.3.5 OUALIFICATIONS. All authorizations, approvals, or
               permits, if any, of any governmental authority or regulatory body
               of the United States or of any state that are required in
               connection with the lawful issuance and sale of Shares to the
               Subsequent Purchasers or the execution, delivery and performance
               by the Company of this Agreement and the Stockholders Agreement
               shall have been duly obtained and shall be effective on and as of
               the First Subsequent Closing, other than those which are not
               required to be obtained before the First Subsequent Closing.

                    4.3.6 AMENDMENT TO STOCKHOLDERS AGREEMENT. The Amendment to
               Stockholders Agreement in the form attached hereto as EXHIBIT N
               shall have been executed and delivered by the parties thereto
               (other than the Purchasers in their capacity as such), no such
               party shall be in breach or default thereof and the Amendment to
               Stockholders Agreement shall be in full force and effect as of
               the First Subsequent Closing.

                    4.3.7 CONTINUED FULFILLMENT. The conditions set forth in
               Sections 4.1.4, 4.1.5 and 4.1.6 shall continue to have been
               fulfilled at the First Subsequent Closing.

                    4.3.8 SECRETARY'S CERTIFICATE. The Secretary of the Company
               shall have delivered to the Subsequent Purchasers at the First
               Subsequent Closing a Certificate dated as of the First Subsequent
               Closing, certifying: (a) that attached thereto is a true and
               complete copy of the by-laws of the Company as in effect on the
               date of such certification; (b) that attached thereto is a true
               and complete copy of all resolutions adopted by the board of
               directors of the Company authorizing the execution, delivery and
               performance of this Amendment and the Amendment to Stockholders
               Agreement and the issuance, sale and delivery of the Shares, and
               that all such resolutions are in full force and effect and are
               all the resolutions adopted in connection with the transactions
               contemplated by this Agreement and the Stockholders Agreement;
               (c) that attached thereto is a true and complete copy of the
               charter of the Company as amended by the Second Amended Charter
               and (d) to the incumbency and specimen signature of certain
               officers of the Company.

                    4.3.9 OPINION OF COMPANY COUNSEL. The Subsequent Purchasers
               shall have received from Piper Marbury Rudnick & Wolfe LLP,
               counsel for the Company, an opinion substantially in the form
               (including, with respect to the Second Amended Charter, paragraph
               3) attached hereto as EXHIBIT G.

                                      -4-

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                    4.3.10 THIRD PARTY CONSENTS. The Company and each Subsidiary
               shall have received all required third party consents necessary
               to the consummation of the transactions contemplated by this
               Agreement.

                    4.3.11 PROCEEDINGS AND DOCUMENTS. All instruments and legal,
               governmental, administrative, corporate and partnership
               proceedings in connection with the issuance of Shares, this
               Agreement and the Amendment to Stockholders Agreement shall be
               reasonably satisfactory in form and substance to the Subsequent
               Purchasers, and the Subsequent Purchasers shall have received
               copies of all documents, including, without limitation, records
               of corporate or other proceedings, and any consents, licenses,
               approvals, permits and orders required to be secured by the
               Company in connection with the issuance of Shares, this Agreement
               and the Amendment to Stockholders Agreement or which any
               Purchaser may have reasonably requested in connection therewith.

               4.4. OTHER SUBSEQUENT CLOSINGS. The obligations of each of the
          Bain Purchasers under Section 1 of this Agreement to purchase Shares
          at each Subsequent Closing other than the First Subsequent Closing are
          subject to the fulfillment on or before each such Subsequent Closing
          of each of the following conditions unless waived in accordance with
          Section 8.1:

                    4.4.1. REPRESENTATIONS AND WARRANTIES. The representations
               and warranties of the Company contained in Section 2 shall be
               true and correct in all material respects on and as of the date
               of each Subsequent Closing with the same effect as though such
               representations and warranties had been made on and as of the
               date of such Subsequent Closing and the Bain Purchasers shall
               have received a certificate of the Chief Executive Officer or
               Chief Operating Officer of the Company to that effect.

                    4.4.2 PERFORMANCE. The Company shall have performed and
               complied with all agreements, obligations, and conditions
               contained in this Agreement and the Stockholders Agreement that
               are required to be performed or complied with by it on or before
               such Subsequent Closing.

                    4.4.3 BOARD DETERMINATIONS. The board of directors of the
               Company shall have approved all issuances of Shares at such
               Subsequent Closing and determined that the financing to be
               provided by the issuance and sale of Shares at such Subsequent
               Closing is necessary or desirable in connection with the funding
               of the business of the Company and its Subsidiaries.

                    4.4.4 CONTINUED FULFILLMENT. The conditions set forth in
               Sections 4.1.4, 4.1.5 and 4.1.6 shall continue to have been
               fulfilled at each such Subsequent Closing.

                                      -5-

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                    4.4.5 SECRETARY'S CERTIFICATE. The Secretary of the Company
               shall have delivered to the Bain Purchasers at such Subsequent
               Closing a Certificate, dated as of such Subsequent Closing,
               certifying: (a) that attached thereto is a true and complete copy
               of the by-laws of the Company as in effect on the date of such
               certification; (b) that attached thereto is a true and complete
               copy of all resolutions adopted by the board of directors of the
               Company authorizing the issuance, sale and delivery of the
               Shares, and that all such resolutions are in full force and
               effect and are all the resolutions adopted in connection with the
               transactions contemplated by this Agreement and the Stockholders
               Agreement; (c) that attached thereto is a true and complete copy
               of the charter of the Company as amended by the Second Amended
               Charter and (d) to the incumbency and specimen signature of
               certain officers of the Company.

                    4.4.6 OUALIFICATIONS. All authorizations, approvals, or
               permits, if any, of any governmental authority or regulatory body
               of the United States or of any state that are required in
               connection with the lawful issuance and sale of Shares to the
               Bain Purchasers or the execution, delivery and performance by the
               Company of this Agreement and the Stockholders Agreement shall
               have been duly obtained and shall be effective on and as of each
               Subsequent Closing, other than those which are not required to be
               obtained before each Subsequent Closing.

                    4.4.7 OPINION OF COMPANY COUNSEL. The Purchasers shall have
               received from Piper Marbury Rudnick & Wolfe LLP, counsel for the
               Company, an opinion substantially in the form (other than
               paragraph 3) attached hereto as EXHIBIT C.

                    4.4.8 THIRD PARTY CONSENTS. The Company and each Subsidiary
               shall have received all required third party consents necessary
               to the consummation of the transactions contemplated by this
               Agreement.

                    4.4.9 PROCEEDINGS AND DOCUMENTS. All instruments and legal,
               governmental, administrative, corporate and partnership
               proceedings in connection with the issuance of Shares, this
               Agreement and the Stockholders Agreement shall be reasonably
               satisfactory in form and substance to the Bain Purchasers, and
               the Bain Purchasers shall have received copies of all documents,
               including, without limitation, records of corporate or other
               proceedings, and any consents, licenses, approvals, permits and
               orders required to be secured by the Company in connection with
               the issuance of Shares, this Agreement and the Stockholders
               Agreement or which any Purchaser may have reasonably requested in
               connection therewith."

     7. Section 6.3 of the Stock Purchase Agreement is hereby amended by
replacing it in its entirety with the following:

                                      -6-
<PAGE>

          "OTHER PURCHASERS" shall mean BancBoston Robertson Stephens Inc.,
     Bayview 99 I, L.P., Bayview 99 II, L.P., Clark Callander, Richard
     Innenberg, JP Morgan, Mount Washington, Simon, P. Cady, D. Cady and DG
     Cady."

     8. Each of JP Morgan, Mount Washington, Simon, P. Cady, D. Cady and DG Cady
shall become a party to the Stock Purchase Agreement by its execution of the
signature page hereto and shall be designated as a "Purchaser" thereunder.

     9. EXHIBIT A to the Stock Purchase Agreement is hereby amended by replacing
it in its entirety with EXHIBIT A attached hereto.

     10. The parties hereto acknowledge that Susan E. Rivera and Thomas J.
Rivera ("RIVERA") have preemptive rights under the Stockholders Agreement in
connection with the issuance of Shares at the First Subsequent Closing which
they have not exercised to date. The number of shares of Series Cl Preferred
Stock authorized in the Second Amended Charter shall be sufficient to
accommodate the issuance of Shares to Rivera in the event Rivera exercises its
preemptive rights. In the event that Rivera exercises its preemptive rights to
purchase shares of Series Cl Preferred Stock, the parties agree that Rivera may
become a party to the Stock Purchase Agreement by executing a joinder agreement
and upon execution of such joinder agreement shall be designated as a
"Purchaser" under the Stock Purchase Agreement entitled to rights and subject to
obligations applicable to a Purchaser thereunder.

     11. Except as specifically amended by this Amendment, the Stock Purchase
Agreement shall remain in full force and effect in accordance with its terms.

     12. This Amendment may be executed in any number of counterparts, each of
which shall constitute an original, but all of which, taken together, shall
constitute one and the same agreement.

                                      -7-
<PAGE>

     IN WITNESS WHEREOF, each of the undersigned has duly executed this
Amendment as of the date first written above.

THE COMPANY:              ADVANCED TELECOMMUNICATIONS, INC.

                          By: /s/ Clifford D. Williams
                              -----------------------------------------
                              Clifford D. Williams,
                              Chief Executive Officer

<PAGE>

BAIN PURCHASERS:                   BAIN CAPITAL FUND VI, L.P.
                                   By: Bain Capital Partners VI, L.P.,
                                         its general partner
                                   By: Bain Capital Investors VI, Inc.,
                                         its general partner

                                   By:  /s/  Michael A. Krupka
                                       -----------------------------------
                                   Name:   Michael A. Krupka
                                   Title: Managing Director

                                   BCIP ASSOCIATES II
                                   BCIP TRUST ASSOCIATES II
                                   BCIP ASSOCIATES II-B
                                   BCIP TRUST ASSOCIATES II-B
                                   BCIP ASSOCIATES II-C
                                   By: Bain Capital, Inc.,
                                         their Managing Partner

                                   PEP INVESTMENTS PTY LTD.
                                   By: Bain Capital, Inc.,
                                         its attorney-in-fact

                                   By:  /s/  Michael A. Krupka
                                       ------------------------------------
                                   Name:   Michael A. Krupka
                                   Title: Managing Director

                                   SANKATY HIGH YIELD ASSET PARTNERS, L.P.
                                   By  /s/ Jonathan S. Levine
                                       ------------------------------------
                                   Name:  Jonathan S. Levine
                                   Title: Managing Director

                                   RGTP, LLC

                                   By:_____________________________________
                                   Name:
                                   Title:

<PAGE>

BAIN PURCHASERS:                   BAIN CAPITAL FUND VI, L.P.
                                   By:  Bain Capital Partners VI, L.P.,
                                           its general partner
                                   By:  Bain Capital Investors VI, Inc.,
                                           its general partner
                                   By:______________________________________
                                   Name:   Michael A. Krupka
                                   Title: Managing Director

                                   BCIP ASSOCIATES II
                                   BCIP TRUST ASSOCIATES II
                                   BCIP ASSOCIATES II-B
                                   BCIP TRUST ASSOCIATES II-B
                                   BCIP ASSOCIATES II-C
                                   By: Bain Capital, Inc.,
                                         their Managing Partner

                                   PEP INVESTMENTS PTY LTD.
                                   By: Bain Capital, Inc.,
                                         its attorney-in-fact

                                   By:_______________________________________
                                   Name:   Michael A. Krupka
                                   Title: Managing Director

                                   SANKATY HIGH YIELD ASSET PARTNERS, L.P.

                                   By _______________________________________
                                      Name:
                                      Title: Managing Director

                                   RGIP, LLC

                                   By: /s/ R. Bradford Malt
                                       --------------------------------------
                                   Name: R. Bradford Malt
                                   Title: Managing Member

<PAGE>

STOLBERG:                          STOLBERG MEEHAN & SCANO II, L.P.
                                   A DELAWARE LIMITED PARTNERSHIP
                                   BY: STOLBERG MEEHAN & SCANO LLC,
                                       GENERAL PARTNER

                                   By: /s/
                                      ----------------------------------------
                                   Name:
                                   Title:

<PAGE>

JP MORGAN:                         J.P. MORGAN VENTURES CORPORATION

                                   By: /s/ John A. Mayer
                                      ----------------------------------------
                                   Name: John A. Mayer
                                   Title: Director

<PAGE>

MOUNT WASHINGTON:                  MOUNT WASHINGTON ASSOCIATES L.L.C.

                                   By: /s/ Edwin M. Martin, Jr.
                                      ----------------------------------------
                                   Name: Edwin M. Martin, Jr.
                                   Title: Managing Member

<PAGE>

SIMON:                             /s/ Steven M. Simon
                                   -------------------------------------------
                                   Steven M. Simon

<PAGE>

CADY:                              /s/ Paul Cady
                                   -------------------------------------------
                                   Paul Cady

<PAGE>

DG CADY:                           /s/  David G. Cady & Kim S. Cady
                                   -------------------------------------------
                                   David G. Cady & Kim S. Cady,
                                   as Joint Tenants

<PAGE>

D. CADY:                           /s/  Daniel P. Cady & Jane Maland Cady
                                   -------------------------------------------
                                   Daniel P. Cady & Jane Maland Cady,
                                   as Joint Tenants<PAGE>

                                                                  Exh.10.1.33

                         COMMON STOCK PURCHASE AGREEMENT

                  THIS COMMON STOCK PURCHASE AGREEMENT (the "AGREEMENT") is made
as of March 31, 2000 by and among Advanced Telecommunications, Inc., a Delaware
corporation (the "Company"), FSC Corp. ("FSC CORP."), General Electric Capital
Corporation ("GECC"), and the other investors listed on SCHEDULE I hereto
(collectively with FSC Corp. and GECC, the "PURCHASERS" and each, a
"PURCHASER").

                  WHEREAS, the Company wishes to issue and sell to the
Purchasers an aggregate of 488,742 shares (the "PURCHASED COMMON SHARES") of the
authorized but unissued Common Stock, $0.01 par value per share, of the Company
(the "COMMON STOCK"); and

                  WHEREAS, the Purchasers wish to purchase the Purchased Common
Shares on the terms and subject to the conditions set forth in this Agreement;

                  NOW, THEREFORE, in consideration of the promises and mutual
covenants contained in this Agreement, the parties hereby agree as follows:

                                   ARTICLE I

                           THE PURCHASED COMMON SHARES

                  Section 1.1. ISSUANCE, SALE AND DELIVERY OF THE PURCHASED
COMMON SHARES. The Company agrees to issue and sell to the Purchasers, and the
Purchasers hereby agree to purchase from the Company, the number of Purchased
Common Shares set forth opposite the name of each Purchaser under the heading
"Number of Purchased Common Shares" on SCHEDULE I.

                  Section 1.2. PURCHASE PRICE OF PURCHASED COMMON SHARES. Each
Purchaser shall pay $6.54 per share for its respective number of the Purchased
Common Shares. The portion of the aggregate purchase price for the Purchased
Common Shares to be paid by each Purchaser is set forth opposite the name of the
Purchaser under the heading "Aggregate Purchase Price" on SCHEDULE I.

                  Section 1.3. CLOSING.

                  (a) The initial closing of the sale and purchase of the
Purchased Common Shares (the "INITIAL CLOSING") shall take place at the office
of Piper Marbury Rudnick & Wolfe LLP, 1200 Nineteenth Street, N.W., Washington,
D.C. 20036, at 10 a.m., on March 31, 2000, or via facsimile on that date and at
such time as the Company and the Purchasers participating in the Initial Closing
shall designate (such date is hereinafter referred to as the "INITIAL CLOSING
DATE").

<PAGE>

                  (b) The subsequent closing of the sale and purchase of the
Purchased Common Shares (the "SUBSEQUENT CLOSING") shall take place on or before
the 10th day following the Initial Closing Date. The date of the Subsequent
Closing is hereinafter referred to as the "SUBSEQUENT CLOSING DATE". Each
closing, including the Initial Closing, is hereinafter referred to as a
"CLOSING", with the respective date referred to as the "CLOSING DATE". This
Purchase Agreement shall become effective as to each Purchaser on such
Purchaser's Closing Date, which is set forth next to such Purchaser's name on
the signature pages hereto.

                  (c) As soon as practicable after each Closing, the Company
shall issue and deliver to each Purchaser a stock certificate issued in the name
of such Purchaser representing the Purchased Common Shares being purchased by
it. As payment in full for the Purchased Common Shares being purchased by it
under this Agreement, and against delivery of such stock certificate, at each
Closing each Purchaser shall deliver to the Company by certified check or wire
transfer the "Aggregate Purchase Price" set forth opposite such Purchaser's name
on SCHEDULE I.

                                   ARTICLE II

                  REPRESENTATIONS AND WARRANTIES OF THE COMPANY

                  The Company represents and warrants to the Purchaser that:

                  Section 2.1. ORGANIZATION, QUALIFICATIONS AND CORPORATE POWER.
The Company is a corporation duly incorporated, validly existing and in good
standing under the laws of the State of Delaware and is duly licensed or
qualified to transact business as a foreign corporation and is in good standing
in each jurisdiction in which the nature of the business transacted by it or the
character of the properties owned or leased by it requires such licensing or
qualification. The Company has the corporate power and authority to own and hold
its properties and to carry on its business as now conducted and as proposed to
be conducted, to execute, deliver and perform this Agreement and Amendment No. 2
to Amended and Restated Stockholders Agreement by and among the Company and
certain of the Purchasers, dated as of the date hereof ("AMENDMENT NO. 2"), and
to issue, sell and deliver the Purchased Common Shares.

                  Section 2.2. DUE AUTHORIZATION; NON-CONTRAVENTION.

                  (a) The execution and delivery by the Company of this
Agreement and Amendment No. 2, the performance by the Company of its obligations
hereunder and thereunder, and the issuance, sale and delivery of the Purchased
Common Shares (i) have been duly authorized by all requisite corporate action,
(ii) will not violate any provision of law, any order of any court or other
agency of government, the Certificate of Incorporation, as amended and in effect
on the date hereof (the "CHARTER") or the By-laws of the Company, as amended and
in effect on the date hereof, or any provision of any indenture, agreement or
other instrument to which the Company or any of its properties or assets is
bound, or conflict with, result in a breach of, constitute (with due notice or
lapse of time or both) a default under, accelerate or terminate

                                     - 2 -
<PAGE>

any such indenture, agreement or other instrument, or result in the creation or
imposition of any lien, charge, restriction, claim or encumbrance of any nature
whatsoever upon any of the properties or assets of the Company and (iii) will
not require any notice, consent or waiver under any material indenture,
agreement or other instrument to which the Company is a party or by which any of
its properties or assets are bound.

                  (b) When issued in accordance with this Agreement, the
Purchased Common Shares will be duly authorized, validly issued, fully paid and
nonassessable shares of Common Stock and will be free and clear of all liens,
charges, restrictions, claims and encumbrances imposed by or through the Company
except as set forth in this Agreement, that certain Amended and Restated
Stockholders Agreement by and among the Company and the stockholder parties
thereto, dated September 30, 1999 (the "STOCKHOLDERS AGREEMENT"), as amended
through Amendment No. 2, and the Charter. The issuance, sale or delivery of the
Purchased Common Shares is not subject to any preemptive right of stockholders
of the Company, or to any right of first refusal or other right in favor of any
person, which right has not been duly and validly waived.

                  Section 2.3. CONSENTS AND APPROVALS. No authorization, action,
consent, approval or other order of, declaration to, or filing by the Company
with any federal state, municipal, foreign or other court or governmental body
or agency, or any other regulatory body, or any other person or entity is
required in connection with the valid and lawful authorization, execution,
delivery and performance by the Company of this Agreement or Amendment No. 2, or
the valid and lawful consummation by the Company of the transactions
contemplated hereby or thereby, except any filing, consent or approval that has
been made or obtained, and any "blue sky" filings to be made in connection with
the issuance of the Purchased Common Shares.

                  Section 2.4. VALIDITY. This Agreement has been duly executed
and delivered by the Company and constitutes the legal, valid and binding
obligation of the Company, enforceable in accordance with its terms. Amendment
No. 2, when executed and delivered in accordance with this Agreement, will
constitute the legal, valid and binding obligation of the Company, enforceable
in accordance with its terms.

                  Section 2.5. CAPITALIZATION. As of the date hereof, the
capitalization of the Company is as set forth on SCHEDULE II hereto.

                  Section 2.5. NO MATERIAL CHANGES. There have been no material
changes to the business or to the financial condition of the Company since the
sale of Series C1 Preferred Stock of the Company on December 13, 1999 pursuant
to that certain Series C Preferred Stock Purchase Agreement by and among the
Company and the purchasers listed therein, dated as of September 30, 1999, as
amended by Amendment No. 1 to Series C Preferred Stock Purchase Agreement, by
and among the Company and the purchasers listed therein, dated as of December
13, 1999.

                                     - 3 -
<PAGE>

                                  ARTICLE III

                 REPRESENTATIONS AND WARRANTIES OF THE PURCHASER

                  Each Purchaser hereby represents and warrants to the Company
that:

                  Section 3.1. BLUE SKY MATTERS. It received any materials in
connection with the offering of the Purchased Common Shares and first learned of
such offering in the state listed as its home state set forth on SCHEDULE I
hereto, and intends that the state securities laws of that state alone shall
govern its purchase of the Purchased Common Shares.

                  Section 3.2. CERTAIN SECURITIES MATTERS.

                  (a) It has sufficient knowledge and experience in investing in
companies similar to the Company in terms of the Company's stage of development
so as to be able to evaluate the risks and merits of its investment in the
Company and it is able financially to bear the risks thereof;

                  (b) It has had an opportunity to discuss the Company's
business, management and financial affairs with the Company's management;

                  (c) The Purchased Common Shares being purchased by it are
being acquired for its own account for the purpose of investment and not with a
view to or for sale in connection with any distribution thereof, except in
accordance with the Securities Act of 1933, as amended (the "SECURITIES ACT")
and the rules and regulations promulgated thereunder and all applicable state
securities or blue sky laws;

                  (d) It understands that (i) the Purchased Common Shares have
not been registered under the Securities Act by reason of their issuance in a
transaction exempt from the registration requirements of the Securities Act and
the Company's reliance on such exemption is predicated upon the Purchaser's
representations set forth in this Article III, (ii) the Purchased Common Shares
must be held indefinitely unless a subsequent disposition thereof is registered
under the Securities Act and all applicable state securities and "blue sky" laws
or unless such disposition is exempt from such registration, (iii) the Purchased
Common Shares will bear a legend to such effect and (iv) the Company will make a
notation on its transfer books to such effect;

                  (e) If it sells any Purchased Common Shares pursuant to Rule
144A promulgated under the Securities Act, it will take all necessary steps in
order to perfect the exemption from registration provided thereby, including (i)
obtaining on behalf of the Company information to enable the Company to
establish a reasonable belief that the purchaser is a qualified institutional
buyer and (ii) advising such purchaser that Rule 144A is being relied upon with
respect to such resale;

                                     - 4 -
<PAGE>

                  (f) It acknowledges and agrees that (i) a reasonable time
prior to the date hereof it received from the Company, and carefully reviewed,
certain materials prepared by the Company that describe the business and
financial condition of the Company (the "DISCLOSURE MATERIALS"), and (ii) it had
reasonable time and opportunity to ask questions and receive answers concerning
the Disclosure Materials and to obtain any additional information from the
Company that was necessary for it to verify the accuracy of the Disclosure
Materials; and

                  (g) It acknowledges and agrees that the stock certificate
representing the Purchased Common Shares shall bear the legend set forth in the
Stockholders Agreement.

                  Section 3.3. BROKERS. It has no contract, arrangement or
understanding with any broker, finder or similar agent with respect to the
transactions contemplated by this Agreement.

                  Section 3.4. INVESTMENT INTENT. It confirms that its purchase
of the Purchased Common Shares is solely for investment and that pursuant to
this Agreement the Purchaser is making an acquisition of voting securities
solely for purposes of investment in accordance with 16 CFR Section 802.9.

                                   ARTICLE IV

         CONDITIONS TO THE OBLIGATIONS OF THE PURCHASER AND THE COMPANY

                  Section 4.1. CONDITIONS TO THE OBLIGATION OF THE PURCHASER.
The obligation of each Purchaser to purchase and pay for the Purchased Common
Shares being purchased by it on the Closing Date is, at its option, subject to
the satisfaction, on or before the Closing Date, of the following conditions:

                  (a) OPINION OF COMPANY'S COUNSEL. The Purchaser shall have
received from Piper Marbury Rudnick & Wolfe LLP, special counsel for the
Company, one or more opinions dated as of the Initial Closing Date in form and
scope satisfactory to the Purchaser and its counsel.

                  (b) REPRESENTATIONS AND WARRANTIES TO BE TRUE AND CORRECT. The
representations and warranties contained in Article II shall be true, complete
and correct on and as of the Initial Closing Date with the same effect as though
such representations and warranties had been made on and as of such date, and an
authorized officer of the Company shall have certified to such effect to the
Purchaser in writing.

                  (c) PERFORMANCE. The Company shall have performed and complied
in all material respects with all agreements contained herein required to be
performed or complied with by it prior to or at the Initial Closing Date, and an
authorized officer of the Company shall have certified to the Purchaser in
writing to such effect and to the further effect that all of the conditions set
forth in this Section 4.1 have been satisfied.

                                     - 5 -
<PAGE>

                  (d) SUPPORTING DOCUMENTS. The Purchaser shall have received
copies of the following documents:

                  (i) (A) the Charter, certified as of a recent date by the
Secretary of State of the State of Delaware and (B) a certificate of said
Secretary dated as of a recent date as to the due incorporation and good
standing of the Company; and

                  (ii) a certificate of the Secretary or an Assistant Secretary
of the Company dated the Initial Closing Date and certifying: (A) that attached
thereto is a true and complete copy of the By-laws of the Company as in effect
on the date of such certification; (B) that attached thereto is a true and
complete copy of all resolutions adopted by the Board of Directors of the
Company authorizing the execution, delivery and performance of this Agreement
and Amendment No. 2, the issuance, sale and delivery of the Purchased Common
Shares and that all such resolutions are in full force and effect; (C) that the
Charter has not been amended since the date of the certificate delivered
pursuant to clause (i) above; and (D) to the incumbency and specimen signature
of each officer of the Company executing this Agreement and Amendment No. 2 and
any certificate or instrument furnished pursuant hereto.

                  (e) STOCKHOLDERS AGREEMENT. The Company shall have executed
and delivered Amendment No. 2.

                  Section 4.2. CONDITIONS TO THE OBLIGATION OF THE COMPANY. The
obligation of the Company to issue the Purchased Common Shares being sold by it
on the Closing Date is, at its option, subject to the satisfaction, on or before
the Closing Date, of the following conditions:

                  (a) PURCHASE PRICE. Each Purchaser shall have paid the
aggregate purchase price for the Purchased Common Shares set forth opposite the
Purchaser's name under the heading "Aggregate Purchase Price" on SCHEDULE I.

                  (b) STOCKHOLDERS AGREEMENT. Each Purchaser who is not already
a party to the Stockholders Agreement, as amended, shall have executed and
delivered Amendment No. 2.

                                   ARTICLE V

                                  MISCELLANEOUS

                  Section 5.1. EXPENSES. Each party hereto will pay its own
expenses in connection with the transactions contemplated hereby, whether or not
such transactions shall be consummated.

                  Section 5.2. SURVIVAL OF AGREEMENTS. All covenants,
agreements, representations and warranties made herein shall survive the
execution and delivery of this Agreement and the issuance, sale and delivery of
the Purchased Common Shares.

                                     - 6 -
<PAGE>

                  Section 5.3. BROKERAGE. Each party hereto will indemnify and
hold harmless the others against and in respect of any claim for brokerage or
other commissions relative to this Agreement or to the transactions contemplated
hereby, based in any way on agreements, arrangements or understandings made or
claimed to have been made by such party with any third party.

                  Section 5.4. PARTIES IN INTEREST. All representations,
covenants and agreements contained in this Agreement by or on behalf of any of
the parties hereto shall bind and inure to the benefit of the respective
successors and assigns of the parties hereto whether so expressed or not.

                  Section 5.5. NOTICES. All notices, requests, consents and
other communications hereunder shall be in writing and shall be delivered in
person, mailed by certified or registered mail, return receipt requested, or
sent by facsimile, telecopier or telex, addressed as follows:

                  (a) if to the Company, at 730 2nd Avenue South, Suite 1200,
Minneapolis, Minnesota 55402, Attention: Chief Financial Officer, (612) 376-4411
(facsimile), with a copy to Edwin M. Martin, Jr., Piper Marbury Rudnick & Wolfe
LLP, 1200 Nineteenth Street, N.W., Washington, D.C. 20036, (202) 223-2085
(facsimile); and

                  (b) if to any Purchaser, at the address or facsimile,
telecopier or telex number of such Purchaser on record with the Company;

                  (c) or, in any such case, at such other address or addresses
as shall have been furnished in writing by such party to the others.

Each such notice, request, consent or other communication shall be treated as
having been given when delivered if delivered personally, or upon confirmation
of receipt if sent by facsimile, mail or overnight delivery.

                  Section 5.6. GOVERNING LAW. This Agreement shall be governed
by and construed in accordance with the laws of the State of Delaware.

                  Section 5.7. ENTIRE AGREEMENT. This Agreement, including the
Schedules hereto, constitutes the sole and entire agreement of the parties with
respect to the subject matter hereof.

                  Section 5.8. COUNTERPARTS. This Agreement may be executed in
two or more counterparts, each of which shall be deemed an original, but all of
which together shall constitute one and the same instrument.

                  Section 5.9. AMENDMENTS. This Agreement may not be amended or
modified, and no provisions hereof may be waived, without the written consent of
the Company and the Purchasers purchasing a majority of the Purchased Common
Shares.

                                     - 7 -
<PAGE>

                  Section 5.10. SEVERABILITY. If any provision of this Agreement
shall be declared void or unenforceable by any judicial or administrative
authority, the validity of any other provision and of the entire Agreement shall
not be affected thereby.

                  Section 5.11. TITLES AND SUBTITLES. The titles and subtitles
used in this Agreement are for convenience only and are not to be considered in
construing or interpreting any term or provision of this Agreement.

                                     - 8 -
<PAGE>

                  IN WITNESS WHEREOF, the undersigned have executed this Common
Stock Purchase Agreement as of the day and year first above written.

                                      ADVANCED TELECOMMUNICATIONS, INC.

                                      By:
                                         --------------------------------------
                                      Name:                  Date
                                      Title:

                                      FSC CORP.

                                      By:
                                         --------------------------------------
                                      Name:                  Date
                                      Title:

                                      GENERAL ELECTRIC CAPITAL CORPORATION

                                      By:
                                         --------------------------------------
                                      Name:                  Date
                                      Title:

                                      -----------------------------------------
                                      Sheldon Allen          Date

                                      -----------------------------------------
                                      Gerry Boeke            Date

                                      -----------------------------------------
                                      Carol Braun            Date

                                     - 9 -
<PAGE>

                                      -----------------------------------------
                                      Janet Darkenwald       Date

                                      -----------------------------------------
                                      Arlin Goldberg         Date

                                      -----------------------------------------
                                      Greg Griffiths         Date

                                      -----------------------------------------
                                      Paul Hanser            Date

                                      -----------------------------------------
                                      Dave Kunde             Date

                                      -----------------------------------------
                                      Greg Lopata            Date

                                      -----------------------------------------
                                      Mike Lopata            Date

                                      -----------------------------------------
                                      Bill Markert           Date

                                     - 10 -
<PAGE>

                                      -----------------------------------------
                                      Marvin Moses           Date

                                      -----------------------------------------
                                      Kris Nandakumar        Date

                                      -----------------------------------------
                                      Jeff Oxley             Date

                                      -----------------------------------------
                                      Bob Pickens            Date

                                      -----------------------------------------
                                      Lynne Powers           Date

                                      -----------------------------------------
                                      Mike Robinson          Date

                                      -----------------------------------------
                                      Ninette Sandefeur      Date

                                      -----------------------------------------
                                      Bill Shanley           Date

                                     - 11 -
<PAGE>

                                      -----------------------------------------
                                      Steven Simon           Date

                                      -----------------------------------------
                                      Richard Smith          Date

                                      -----------------------------------------
                                      Bob Thompson           Date

                                      -----------------------------------------
                                      Satish Tiwari          Date

                                      -----------------------------------------
                                      Steve Wachter          Date

                                      -----------------------------------------
                                      Bill Whitney           Date

                                      -----------------------------------------
                                      Arthur H. Zeile        Date

                                      -----------------------------------------
                                      Geoffrey Boyd          Date

                                     - 12 -

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