Document:

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                                                                    EXHIBIT 10.4

                               SECURITY AGREEMENT

         This Security Agreement dated as of January 25, 2001, ("Security
Agreement") is entered into by and among Corzon, Inc., a Texas corporation
("Debtor"), Debtor's Significant Subsidiaries (as defined below) and Sherman
LLC, a Cayman Islands limited liability company ("Secured Party").

                                  INTRODUCTION

         Debtor has entered into a $3,500,000 Credit Agreement, dated as of the
date hereof, between Debtor and Secured Party ("Credit Agreement"). Pursuant to
the Credit Agreement, Debtor has executed a Promissory Note, the terms of which
are set forth in the Credit Agreement dated as of the date hereof, in favor of
Secured Party ("Note"). Also pursuant to the Credit Agreement, Debtor's
Significant Subsidiaries have executed a Guaranty, the terms of which are set
forth in the Credit Agreement dated as of the date hereof, guaranteeing the
obligations of the Debtor under the Note, the Credit Agreement and this Security
Agreement ("Guaranty"). To induce Secured Party to enter into the Credit
Agreement and to accept the Note and Guaranty, Debtor and Debtor's Significant
Subsidiaries hereby agree with Secured Party as follows:

SECTION 1. DEFINITIONS. Any terms used in this Security Agreement that are
defined in the Uniform Commercial Code as in effect on the date hereof in the
State of New York ("UCC") shall have the meaning assigned to those terms by the
UCC, whether specified elsewhere in this Security Agreement or not. The
following are additional defined terms within this Security Agreement:

                  "Business Day" means any day which is neither a Saturday or
                  Sunday nor a legal holiday on which banks are authorized or
                  required to be closed in New York, New York.

                  "Debtor Parties" means, collectively, Debtor and Debtor's
                  Significant Subsidiaries.

                  "Event of Default" shall have that meaning set forth in the
                  Credit Agreement.

                  "Lien" means any security interest, mortgage, pledge,
                  hypothecation, assignment, deposit arrangement, encumbrance,
                  lien (statutory or otherwise), charge against or interest in
                  property to secure payment of a debt or performance of an
                  obligation or other priority or preferential arrangement of
                  any kind or nature whatsoever.

                  "Loan Documents" means the Credit Agreement, the Note, the
                  Guaranty and this Security Agreement, including any
                  extensions, modifications, substitutions, amendments and
                  renewals thereof or hereof.

                  "Person" means any natural person, corporation, firm,
                  association, government, governmental agency or any other
                  entity, whether acting in an individual, fiduciary or other
                  capacity.

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                  "Debtor's Significant Subsidiaries" means (i) LecStar
                  Communications Corporation, a Delaware corporation, (ii)
                  LecStar Telecom, Inc., a Georgia corporation, (iii) LecStar
                  Datanet, Inc., a Georgia corporation and (iv) B4B
                  Communications, Ltd, a company formed under the laws of the
                  United Kingdom.

SECTION 2. SECURITY INTEREST.

         2.01 Grant of Security Interest. Debtor Parties hereby grant to Secured
Party a security interest in the Collateral as defined in Section 2.02 below.

         2.02 Collateral. "Collateral" shall mean all of Debtor Parties' right,
title, and interest in the following, whether now owned or hereafter acquired:

                  (a) Accounts. All "accounts" as defined in the UCC and all
rights to payment owing or to be owing to Debtor Parties from third parties,
wherever the records for such accounts are held, and all "instruments" and
"chattel paper" as such terms are defined in the UCC, wherever located, that
represent any right of Debtor Parties to payment for goods sold or leased or for
services rendered, whether or not such right has been earned by performance (all
such accounts, instruments and chattel paper being the "Accounts");

                  (b) Records. All ledger sheets, files, records, and documents
relating to the foregoing Collateral; and

                  (c) Proceeds. All "proceeds" as defined in the UCC, of the
foregoing Collateral and, to the extent not otherwise included, all payments
under any insurance, indemnity, warranty or guaranty of or for the foregoing
Collateral.

SECTION 3. SECURED OBLIGATIONS.

         3.01 Amount of Obligations. The security interest granted in Section 2
above shall secure all obligations of Debtor Parties now or hereafter existing
under the Loan Documents, including any extensions, modifications,
substitutions, amendments and renewals thereof, whether for fees, expenses,
indemnification, or otherwise in connection therewith. All such obligations of
Debtor Parties secured hereby and thereby are referred to as the "Secured
Obligations."

         3.02 Release of Obligations. Notwithstanding anything in this Security
Agreement to the contrary, (a) Debtor Parties shall remain liable under the
contracts and agreements included in the Collateral to the extent set forth
therein to perform all of its duties and obligations thereunder to the same
extent as if this Security Agreement had not been executed, (b) the exercise by
Secured Party of any of its rights hereunder shall not release Debtor Parties
from any of its duties or obligations under the contracts and agreements
included in the Collateral, and (c) Secured Party shall have no obligation or
liability under the contracts and agreements included in the Collateral by
reason of this Security Agreement, nor shall Secured Party be obligated to
perform any of the obligations or duties of Debtor Parties thereunder or to take
any action to collect or enforce any claim for payment assigned hereunder.

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SECTION 4. DEBTOR PARTIES REPRESENTATIONS AND WARRANTIES. Subject to any
restrictions or qualifications on such representations and warranties contained
in the Credit Agreement, Debtor Parties hereby represent and warrant the
following to Secured Party:

         4.01 Debtor's Name. The true and correct name of Debtor as listed on
its charter is Corzon, Inc. and Debtor does business under no other trade names.

         4.02 Debtor's Significant Subsidiaries' Names. The true and correct
names of Debtor's Significant Subsidiaries, as listed on their charters, are
LecStar Communications Corporation and B4B Communications, Ltd, and Debtor's
Significant Subsidiaries do business under no other trade names.

         4.03 Organization and Existence of Debtor Parties. Debtor Parties are
duly incorporated, validly existing and in good standing under the laws of their
respective jurisdictions of incorporation. Debtor Parties have full corporate
power and authority to own and hold the properties and assets they now own and
hold and to carry on their business as and where such properties are now owned
or held and such business is now conducted. Debtor Parties are duly licensed or
qualified to do business as foreign corporations and are in good standing in the
states and countries in which the character of the properties and assets now
owned or held by them or the nature of the business now conducted by them
require them to be so licensed or qualified, except where the failure to be so
qualified or in good standing would not reasonably be expected to have a
material adverse effect on the business, financial condition or results of
operations of Debtor Parties.

         4.04 Authority and Approval. Debtor Parties have the corporate power
and authority to execute and deliver the Loan Documents, to consummate the
transactions contemplated hereby and thereby and to perform all the terms and
conditions hereof and thereof to be performed by them. The execution and
delivery by Debtor Parties of the Loan Documents, the performance by Debtor
Parties of all the terms and conditions hereof and thereof to be performed by
them and the consummation of the transactions contemplated hereby and thereby
have been duly authorized and approved by all requisite corporate action of
Debtor Parties. The Loan Documents constitute the valid and binding obligation
of Debtor Parties enforceable in accordance with their terms, except as such
enforcement may be limited by bankruptcy, insolvency, reorganization, moratorium
or other similar laws affecting enforcement of creditors' rights generally and
by general principles of equity (whether applied in a proceeding at law or in
equity).

         4.05 No Conflict. The Loan Documents and the execution and delivery by
Debtor Parties of each of the Loan Documents does not, and the fulfillment and
compliance with the terms and conditions hereof and thereof and the consummation
of the transactions contemplated hereby and thereby will not:

                  (a) conflict with any of, or require the consent of any person
or entity under, the terms, conditions or provisions of the charter documents or
bylaws or equivalent governing instruments of Debtor Parties;

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                  (b) violate any provision of, or require any consent,
authorization or approval under, any law, statute, ordinance, rule or regulation
or any judicial, administrative or arbitration order, award, judgment, writ,
injunction or decree applicable to Debtor Parties;

                  (c) conflict with, result in a breach of, constitute a default
under (whether with notice or the lapse of time or both), or accelerate or
permit the acceleration of the performance required by or any remedies or any
rights of termination or cancellation or the loss of benefits or change in the
rights or obligations of any party, or require any consent, authorization or
approval under any Lien, indenture, mortgage, or, any contract, permit, lease or
other instrument to which Debtor Parties are a party or by which they are bound
or to which any property of Debtor Parties is subject, which in the aggregate
would reasonably be expected to have a material adverse effect on the business,
financial condition or results of operations of Debtor Parties; or

                  (d) result in the creation of any material Lien, charge or
encumbrance on the assets of Debtor Parties under any Lien, indenture, mortgage,
lease or contract (other than pursuant to the Loan Documents).

         4.06 Accounts. The principal places of business and principle executive
offices of Debtor Parties and the offices where Debtor Parties keep their
records concerning the Accounts are located at the addresses set forth in the
attached Exhibit "A". Except as set forth in that Exhibit, none of the Accounts
are evidenced by a promissory note or other instrument.

         4.07 Other Liens. Debtor Parties own the Collateral free and clear of
any Lien, except for the security interests created by this Security Agreement.
No effective financing statement or other instrument similar in effect covering
all or any part of the Collateral is on file in any recording office, except
such as may have been filed in connection with this Security Agreement.

         4.08 Lien Priority and Perfection. Assuming Secured Party makes the
necessary UCC filings within twenty (20) days after the date hereof, this
Security Agreement creates a valid and perfected first priority purchase money
security interest in the Collateral securing the payment by Debtor Parties of
the Secured Obligations. No other authorization, approval or other action by any
governmental authority or any other person or entity is necessary to (i) grant
the security interest contemplated hereby, (ii) allow Debtor Parties to perform
its obligations hereunder or (iii) permit Secured Party to exercise its rights
and remedies hereunder.

         4.09 Nature of Loan. The loan evidenced and secured by the Loan
Documents is incurred and transacted solely for a business or investment
purpose.

SECTION 5. DEBTOR PARTIES' COVENANTS.

         5.01 Further Assurances.

                  (a) Debtor Parties agree that at any time, at Debtor Parties'
expense, Debtor Parties will promptly execute and deliver all further
instruments and documents, and take all further action, that may be necessary or
that Secured Party may reasonably request, in order to perfect and protect any
security interest granted or purported to be granted hereby or to enable Secured
Party to exercise and enforce its rights and remedies hereunder with respect to
any Collateral. Without limiting the generality of the foregoing, Debtor Parties
will, at Secured

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Party's request: (i) mark conspicuously each instrument, chattel paper or
contract representing Accounts and the records pertaining to the Collateral with
a legend, in form and substance satisfactory to Secured Party, indicating that
such instrument, chattel paper, contract or record is subject to the security
interest granted hereby; (ii) deliver and pledge to Secured Party any promissory
note, certificate of deposit, chattel paper or other instrument representing any
Account, duly indorsed and accompanied by duly executed instruments of transfer
or assignment, all in form and substance reasonably satisfactory to Secured
Party; and (iii) execute and file such financing or continuation statements, or
amendments thereto, and such other instruments or notices as may be necessary,
or as Secured Party may reasonably request, in order to perfect and preserve the
security interests granted or purported to be granted hereby.

                  (b) Debtor Parties will furnish to Secured Party, from
time-to-time, statements and schedules further identifying and describing the
Collateral and such other reports in connection with the Collateral as Secured
Party may reasonably request, all in reasonable detail.

         5.02 Accounts. Debtor Parties shall keep their principal places of
business and principal executive offices and the offices where they keep the
instruments, chattel paper or contracts representing Accounts and the records
concerning the Accounts at the locations therefor specified in the attached
Exhibit "A", or, upon 10 days prior written notice to Secured Party, at such
other locations in a jurisdiction where all actions required by Section 5.01
shall have been taken with respect to the Accounts. Debtor Parties will hold and
preserve such instruments, chattel paper, contracts and records and will permit
representatives of Secured Party at any time during normal business hours to
inspect and copy such.

         5.03 Transfer of Collateral. Debtor Parties shall not sell, assign (by
operation or law or otherwise) or otherwise dispose of any of the Collateral
without the prior written consent of Secured Party.

SECTION 6. REMEDIES. If any Event of Default shall have occurred and remain
uncured:

         6.01 UCC Remedies. To the extent permitted by law, Secured Party may
exercise in respect of the Collateral, in addition to other rights and remedies
provided for in this Security Agreement or otherwise available to it, all the
rights and remedies of a secured party under the UCC (whether or not the UCC
applies to the affected Collateral).

         6.02 Assembly of Collateral. Upon an Event of Default, Secured Party
may require Debtor Parties, at Debtor Parties expense, to promptly assemble all
or part of the Collateral and make it available to Secured Party at a place to
be designated by Secured Party which is reasonably convenient to both parties.
Upon an Event of Default, Secured Party may occupy any premises owned or leased
by Debtor Parties where the Collateral or any part thereof is assembled for a
reasonable period in order to effectuate its rights and remedies hereunder or
under law, without obligation to Debtor Parties in respect of such occupation.

         6.03 Sale of Collateral. Upon an Event of Default, Secured Party may
sell all or part of the Collateral at public or private sale, at any of Debtor
Parties' offices or elsewhere, for cash, on credit or for future delivery, and
upon such other terms as Secured Party may deem commercially reasonable. Debtor
Parties agree that to the extent permitted by law such sales

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may be made without notice. If notice is required by law, Debtor Parties hereby
deem 10-days advance notice of the time and place of any public sale or the time
after which any private sale is to be made, to constitute reasonable
notification, recognizing that if the Collateral threatens to decline speedily
in value or is of a type customarily sold on a recognized market, shorter notice
may be reasonable. Secured Party shall not be obligated to make any sale of
Collateral pursuant to this Section regardless of notice of sale having been or
not been given. Secured Party may adjourn any public or private sale from
time-to-time by announcement at the time and place fixed therefor, and such sale
may, with out further notice, be made at the time and place to which it was so
adjourned.

         6.04 Contract Rights. Secured Party may exercise any rights and
remedies of Debtor Parties under or in connection with the instruments, chattel
paper or contracts which represent Accounts, including, without limitation, any
rights of Debtor Parties to demand or otherwise require payment of any amount
under, or performance of any provisions of, the instruments, chattel paper or
contracts which represent Accounts.

         6.05 Accounts.

                  (a) In the event that there is a default by Debtor under the
Credit Agreement, Secured Party may, or may direct Debtor Parties to, take any
action Secured Party deems necessary or advisable to enforce collection of the
Accounts, including, without limitation, notifying the account debtors or
obligors under any Accounts of the assignment of such Accounts to Secured Party
and directing such account debtors or obligors to make payment of all amounts
due or to become due directly to Secured Party. Upon such notification and
direction, and at the expense of Debtor Parties, Secured Party may enforce
collection of any such Accounts, and adjust, settle or compromise the amount or
payment thereof in the same manner and to the same extent as Debtor Parties
might have done.

                  (b) In the event that there is a default by Debtor under the
Credit Agreement, after receipt by Debtor Parties of the notice referred to in
subsection (a) above, all amounts and proceeds (including instruments) received
by Debtor Parties in respect of the Accounts shall be received in trust for the
benefit of Secured Party hereunder, shall be segregated from other funds of
Debtor Parties, and shall promptly be paid over to Secured Party in the same
form as so received (with any necessary endorsement) to be held as Collateral.
Debtor Parties shall not adjust, settle or compromise the amount or payment of
any Receivable, or release wholly or partly any account debtor or obligor
thereof, or allow any credit or discount thereon.

         6.06 Application of Collateral. All cash proceeds received by Secured
Party from the collection of or other realization of any part of the Collateral
shall be applied by Secured Party against part of the Secured Obligations. Any
surplus of such cash or cash proceeds held by Secured Party and remaining after
payment in full of all the Secured Obligations shall be paid over to Debtor
Parties or to whomever may be lawfully entitled to receive such surplus.

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SECTION 7. SECURED PARTY AS AGENT FOR DEBTOR PARTIES.

         7.01 Attorney-In-Fact. Debtor Parties hereby irrevocably appoint
Secured Party as Debtor Parties' attorney-in-fact, with full authority to act
for Debtor Parties and in the name of Debtor Parties to, in Secured Party's
discretion, take any action and execute any instrument which Secured Party may
deem necessary or advisable to accomplish the purposes of this Security
Agreement, including, without limitation:

                  (a) filing one or more financing or continuation statements,
and amendments thereto, relative to all or any part of the Collateral without
the signature of Debtor Parties where permitted by law; and

                  (b) upon the occurrence and during the continuance of any
Event of Default, to ask, demand, collect, sue for, recover, compromise, receive
and give acquittance and receipts for moneys due and to become due under or in
respect of any of the Collateral and to file any claims or take any action or
institute any proceedings which Secured Party may deem necessary or desirable
for the collection of any of the Collateral or otherwise to enforce the rights
of Secured Party with respect to any of the Collateral.

         The power of attorney granted pursuant to this Section 7.01 is coupled
with an interest and is irrevocable.

         7.02 Secured Party Performance. If Debtor Parties fail to perform any
covenant contained herein, Secured Party may itself perform, or cause
performance of, such covenant, and Debtor Parties shall pay for the expenses of
Secured Party incurred in connection therewith.

         7.03 Secured Party's Duties. The powers conferred on Secured Party
under this Security Agreement are solely to protect its interest in the
Collateral and shall not impose any duty upon it to exercise any such powers.
Except for the safe custody of any Collateral in its possession and the
accounting for monies actually received by it hereunder, Secured Party shall
have no duty as to any Collateral or as to the taking of any necessary steps to
preserve rights against prior parties or any other rights pertaining to any
Collateral.

SECTION 8. MISCELLANEOUS.

         8.01 Indemnity and Expenses.

                  (a) Debtor Parties will, upon demand, indemnify Secured Party
from and against any and all claims, losses and liabilities relating to or
resulting from this Security Agreement (including, without limitation,
enforcement of this Security Agreement and claims, losses and liabilities
resulting from Secured Party's own negligence), except claims, losses or
liabilities resulting from Secured Party's gross negligence or willful
misconduct.

                  (b) Debtor Parties will, upon demand, pay to Secured Party the
amount of any reasonable expenses, including the reasonable fees and
disbursements of its counsel and of any experts and agents, which Secured Party
may incur in connection with (i) after an Event of Default, the custody,
preservation, use or operation of, or the sale, collection or other realization
of, any of the Collateral; provided, however, that under this clause (i) any
expenses shall be

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limited to the prevailing business rates in the area in which the Collateral is
to be sold, (ii) after an Event of Default, the exercise or enforcement of any
of the rights of Secured Party hereunder or (iii) the failure by Debtor Parties
to perform or observe any of the provisions hereof. Such reasonable expenses
shall be part of the Secured Obligations.

         8.02 Continuing Security Interest; Transfer of Interest. This Security
Agreement shall create a continuing security interest in the Collateral and
shall (a) remain in full force and effect until payment in full and termination
of the Secured Obligations, (b) be binding upon Debtor Parties and their
permitted successors and assigns and (c) inure, together with the rights and
remedies of Secured Party hereunder, to the benefit of Secured Party and its
respective successors, transferees and assigns. Upon the payment in full and
termination of the Secured Obligations, the security interest granted hereby
shall terminate and all rights to the Collateral shall revert to Debtor Parties
to the extent such Collateral shall not have been sold or otherwise applied
pursuant to the terms hereof. Upon any such termination, Secured Party will
promptly, at Debtor Parties expense, execute and deliver to Debtor Parties such
documents as Debtor Parties shall reasonably request and take any other actions
reasonably requested to evidence or effect such termination.

         8.03 Waivers. Debtor Parties hereby waive:

                  (a) promptness, diligence, notice of acceptance and any other
notice with respect to any of the Secured Obligations and this Security
Agreement;

                  (b) any requirement that Secured Party protect, secure,
perfect or insure any Lien or any property subject thereto or exhaust any right
or take any action against any other Person or any collateral; and

                  (c) any duty on the part of Secured Party to disclose to
Debtor Parties any matter, fact or thing relating to the business, operation or
condition of Debtor Parties and its assets now or hereafter known by such
Person.

         8.04 Severability. If any provision of this Security Agreement is
rendered or declared illegal or unenforceable by reason of any existing or
subsequently enacted legislation or by decree of a court of last resort, Debtor
Parties and Secured Party shall promptly meet and negotiate substitute
provisions for those rendered or declared illegal or unenforceable, but all of
the remaining provisions of this Security Agreement shall remain in full force
and effect.

         8.05 Binding Effect and Assignment. This Security Agreement shall be
binding upon and inure to the benefit of Debtor Parties and Secured Party and
their respective permitted successors and assigns; but neither this Security
Agreement nor any of the rights, benefits or obligations hereunder shall be
assigned, by operation of law or otherwise, by Debtor Parties without the prior
written consent of Secured Party. Nothing in this Security Agreement, express or
implied, is intended to confer upon any person or entity other than Debtor
Parties and Secured Party and their respective permitted successors and assigns,
any rights, benefits or obligations hereunder. Notwithstanding any provisions
herein to the contrary, the Secured Party may freely pledge or assign its rights
under this Security Agreement without the consent or notice of the Debtor
Parties.

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         8.06 Section Captions. Section captions used in this Security Agreement
are for convenience of reference only, and shall not affect the construction of
this Security Agreement.

         8.07 Notices. Any notice, request, instruction, correspondence or other
document to be given hereunder by one party to the others Shall be deemed to
have been given when sent and shall be in writing and delivered in person or by
courier service requiring acknowledgment of receipt of delivery or mailed by
certified mail, postage prepaid and return receipt requested, or by telecopy, as
follows:

                          If to Debtor Parties, addressed to:

                          Corzon, Inc.
                          Attention: Chief Executive Officer and General Counsel
                          1087 Broad Street, 4th Floor
                          Bridgeport, Connecticut 06604
                          Telecopy:  203-335-1455
                          Telephone: 203-333-6389

                          with a copy to:

                          LecStar Communications Corporation
                          Attention: W. Dale Smith
                          4501 Circle 75 Parkway
                          Building D - 4210
                          Atlanta, Georgia 30339-3025
                          Telecopy:  404-659-4900
                          Telephone: 404-659-9500

                          If to Secured Party, addressed to:

                          Sherman LLC
                          Harbour House, 2nd Floor
                          Waterfront Drive
                          P.O. Box 972
                          Road Town, Tortola
                          British Virgin Islands
                          Telecopy:  284-494-4771

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                          with a copy to:

                          Kevin S. Robins
                          Mayer, Brown & Platt
                          700 Louisiana Street, Suite 3600
                          Houston, Texas 77002-2730
                          Telecopy:  713-632-1803
                          Telephone: 713-547-9603

         8.08 Governing Law. The provisions of this Security Agreement shall be
governed by and construed in accordance with the laws of the State of New York.

         8.09 No Oral Agreements. The Loan Documents, collectively, represent
the final agreement between the parties and may not be contradicted by evidence
of prior, contemporaneous or subsequent oral agreements of the parties. There
are no unwritten oral agreements between the parties.

                                      *****

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         IN WITNESS WHEREOF, the parties duly executed and delivered this
Security Agreement as of the date first written above.

DEBTOR PARTIES:

Corzon, Inc.                              LecStar Communications Corp.

By:    /s/ Lawrence Shatsoff              By:    /s/ William S. Woulfin
Name:  Lawrence Shatsoff                  Name:  William S. Woulfin
Title: President                          Title: Chairman and CEO

LecStar Datanet, Inc.                     LecStar Telecom, Inc.

By:    /s/ William S. Woulfin             By:    /s/ William S. Woulfin
Name:  William S. Woulfin                 Name:  William S. Woulfin
Title: Chairman and CEO                   Title: Chairman and CEO

B4B Communications, Ltd.

By:    /s/ Lawrence Shatsoff
Name:  Lawrence Shatsoff
Title: Vice President

                                   SECURED PARTY:

                                   Sherman LLC

                                   By:    /s/ Arlene de Castro   /s/ David Sims
                                   Name:  Navigator Management, Ltd.
                                   Title: Director

<PAGE>   12

                                   EXHIBIT "A"

  Debtor Parties' principal places of business and principal executive offices.

                           Corzon, Inc.
                           1087 Broad Street, 4th Floor
                           Bridgeport, Connecticut 06604
                           Telecopy:  203-335-1455
                           Telephone: 203-333-6389

                           LecStar Communications Corporation
                           4501 Circle 75 Parkway
                           Building D - 4210
                           Atlanta, Georgia 30339-3025
                           Telecopy: 404-659-4900
                           Telephone: 404-659-9500

                           LecStar Telecom, Inc.
                           4501 Circle 75 Parkway
                           Building D - 4210
                           Atlanta, Georgia 30339-3025
                           Telecopy:  404-659-4900
                           Telephone: 404-659-9500

                           LecStar Datanet, Inc.
                           4501 Circle 75 Parkway
                           Building D - 4210
                           Atlanta, Georgia 30339-3025
                           Telecopy:  404-659-4900
                           Telephone: 404-659-9500

                           B4B Communications, Ltd.
                           15 - 17 Saint Cross Street, Suite 4C
                           Baird House, London, England
                           EC1N 8UW
                           Telecopy:  011-44-207-242-6878
                           Telephone: 011-44-207-242-6858<PAGE>   1
                                                                    EXHIBIT 10.5

         NEITHER THESE SECURITIES NOR THE SECURITIES ISSUABLE UPON
         CONVERSION HEREOF HAVE BEEN REGISTERED WITH THE UNITED STATES
         SECURITIES AND EXCHANGE COMMISSION OR THE SECURITIES
         COMMISSION OF ANY STATE OR UNDER THE SECURITIES ACT OF 1933,
         AS AMENDED. THE SECURITIES ARE RESTRICTED AND MAY NOT BE
         OFFERED, RESOLD, PLEDGED OR TRANSFERRED EXCEPT AS PERMITTED
         UNDER THE ACT PURSUANT TO REGISTRATION OR EXEMPTION OR SAFE
         HARBOR THEREFROM.

No. 00- 3                                                      US $ 2,800,000.00
    -----                                                         --------------

                                  CORZON, INC.
                                formerly known as
                         TANNER'S RESTAURANT GROUP, INC.

              8% AMENDED AND RESTATED SECURED CONVERTIBLE DEBENTURE
                              DUE JANUARY 25, 2003

        THIS DEBENTURE, as amended and restated, is one of a duly authorized
issue of up to $4,553,652 in Debentures of CORZON, INC., formerly known as
TANNER'S RESTAURANT GROUP, INC., a Texas corporation (the "Company") designated
as its 8% Secured Convertible Debentures. Such Debentures may be issued in
series, each of which may have a different maturity date, but which otherwise
have substantially similar terms. Capitalized terms not otherwise defined herein
shall have the meanings ascribed to them in the Securities Purchase Agreement,
dated June 7, 2000 (the "Securities Purchase Agreement"), by and among the
Company and the Buyers (as that term is defined therein).

         FOR VALUE RECEIVED, the Company promises to pay to SHERMAN LLC, the
registered holder hereof (the "Holder"), the principal sum of Two Million Eight
Hundred Thousand Dollars and No Cents (US $2,800,000.00) on January 25, 2003
(the "Maturity Date"), and to pay interest on the principal sum outstanding from
time to time in arrears (i) prior to the Maturity Date, semi-annually, on the
last day of June and December of each year beginning on December 31, 2001, (ii)
upon conversion as provided herein or (iii) on the Maturity Date, at the rate of
Eight Percent (8%) per annum accruing from January 25, 2001(the "Issue Date").
Accrual of interest shall commence on the first such business day to occur after
January 25, 2001, and shall continue to accrue on a daily basis until payment in
full of the principal sum has been made or duly provided for.

         This Debenture is subject to the following additional provisions:

         1. The Debentures are issuable in denominations of Ten Thousand Dollars
(US$10,000) and integral multiples thereof. The Debentures are exchangeable for
an equal aggregate principal amount of Debentures of different authorized
denominations, as requested by

<PAGE>   2

the Holder surrendering the same. No service charge will be made for such
registration or transfer or exchange.

         2. The Company shall be entitled to withhold from all payments of
principal of, and interest on, this Debenture any amounts required to be
withheld under the applicable provisions of the United States income tax laws or
other applicable laws at the time of such payments, and Holder shall execute and
deliver all required documentation in connection therewith. The indebtedness
evidenced hereby is subject to set-off in accordance with the provisions of that
certain Agreement and Plan of Merger among LecStar Communications Corporation, a
Delaware corporation, the Company and a wholly-owned subsidiary of the Company
dated January 5, 2001.

         3. This Debenture has been issued subject to investment representations
of the original purchaser hereof and may be transferred or exchanged only in
compliance with the Securities Act of 1933, as amended (the "Act"), and other
applicable state and foreign securities laws. In the event of any proposed
transfer of this Debenture, the Company may require, prior to issuance of a new
Debenture in the name of such other person, that it receive reasonable transfer
documentation, including legal opinions of counsel reasonably satisfactory to
the Company, that the transfer of the Debenture to such other persons does not
and will not cause a violation of the Act or any applicable state or foreign
securities laws. Prior to due presentment for transfer of this Debenture, the
Company and any agent of the Company may treat the person in whose name this
Debenture is duly registered on the Company's Debenture Register as the owner
hereof for the purpose of receiving payment as herein provided and for all other
purposes, whether or not this Debenture be overdue, and neither the Company nor
any such agent shall be affected by notice to the contrary.

         4. A. The Holder of this Debenture is entitled, at its option, subject
to the following provisions of this Section 4, to convert all or a portion of
this Debenture into shares of Common Stock of the Company, $.01 par value per
share ("Common Stock") of the Company at any time beginning one year from the
Issue Date and ending on the Maturity Date, at a conversion price for each share
of Common Stock (the "Conversion Price") equal to the lower of (x) $0.75 per
share (which amount is subject to adjustment as hereinafter provided; the "Fixed
Conversion Price"), or (y) the Variable Conversion Price (as defined below).

            B. For purposes of this Debenture, the following terms have the
meanings indicated below:

            (i) "Market Price of the Common Stock" means the closing bid price
of the Common Stock for the period indicated in the relevant provision, as
reported by Bloomberg, LP or, if not so reported, as reported on the
over-the-counter market.

            (ii) "Variable Conversion Price" means (x) seventy-five percent
(75%) of (y) the average of the five (5) lowest Market Price of the Common Stock
during the twenty (20) trading days immediately preceding the relevant
Conversion Date (as defined below), except

                                       2
<PAGE>   3

that, to the extent any such trading day occurs prior to the effectuation of a
stock split or similar transaction occurring after the date hereof and on or
prior to the relevant Conversion Date, the Market Price of the Common Stock used
in determining the Variable Conversion Price will be equitably adjusted to
reflect such transaction.

                  C. Conversion shall be effectuated by faxing a Notice of
Conversion (as defined below) to the Company as provided in this paragraph. The
Notice of Conversion shall be executed by the Holder of this Debenture and shall
evidence such Holder's intention to convert this Debenture or a specified
portion hereof in the form annexed hereto as Exhibit A. Interest accrued or
accruing from the date of issuance to the date of conversion or to the Maturity
Date, as the case may be, shall be paid, at the option of the Company, in cash
or, subject to the provisions of Section 4(D) hereof, in Common Stock at the
Conversion Price then applicable as of the Conversion Date. No fractional shares
of Common Stock or scrip representing fractions of shares will be issued on
conversion, but the number of shares issuable shall be rounded to the nearest
whole share. The date on which notice of conversion is given (the "Conversion
Date") shall be deemed to be the date on which the Holder faxes or otherwise
delivers the conversion notice ("Notice of Conversion") to the Company so that
it is received by the Company on or before such specified date, provided that,
if such conversion would convert the entire remaining principal of this
Debenture, the Holder shall deliver to the Company the original Debenture being
converted no later than five (5) business days thereafter. Facsimile delivery of
the Notice of Conversion shall be accepted by the Company at facsimile number
(203) 335-1455; Attn: Larry Shatsoff, President. Certificates representing
Common Stock upon conversion will be delivered to the Holder at the address
specified in the Notice of Conversion (which may be the Buyer's address for
notices as contemplated by the Securities Purchase Agreement or a different
address), via express courier, by electronic transfer or otherwise, within three
(3) business days (such third business day, the "Delivery Date") after the date
on which the Notice of Conversion is delivered to the Company as contemplated in
this Section 4(C).

                  D. Notwithstanding any other provision hereof or of any of the
other Transaction Agreements, in no event (except (i) with respect to a
Redemption Notice Conversion (as defined below), (ii) as specifically provided
in this Debenture as an exception to this provision, or (iii) while there is
outstanding a tender offer for any or all of the shares of the Company's Common
Stock) shall the Holder be entitled to convert any Debenture or shall the
Company have the obligation to convert all or any portion of this Debenture (and
the Company shall not have the right to pay interest on this Debenture) to the
extent that, after such conversion, the sum of (1) the number of shares of
Common Stock beneficially owned by the Holder and its affiliates (other than
shares of Common Stock which may be deemed beneficially owned through the
ownership of the unconverted portion of the Debentures), and (2) the number of
shares of Common Stock issuable upon the conversion of the Debentures with
respect to which the determination of this proviso is being made, would result
in beneficial ownership by the Holder and its affiliates of more than 4.99% of
the outstanding shares of Common Stock (after taking into account the shares to
be issued to the Holder upon such conversion). For purposes of the proviso to
the immediately preceding sentence, beneficial ownership shall be determined in
accordance with Section 13(d) of the Securities Exchange Act of 1934, as

                                       3
<PAGE>   4

amended (the "1934 Act"), except as otherwise provided in clause (1) of such
sentence. The Holder, by its acceptance of this Debenture, further agrees that
if the Holder transfers or assigns any of the Debentures to a party who or which
would not be considered such an affiliate, such assignment shall be made subject
to the transferee's or assignee's specific agreement to be bound by the
provisions of this Section 4(D) as if such transferee or assignee were the
original Holder hereof.

            E. Anything herein to the contrary notwithstanding, in the event the
Company breaches the provisions of Section 4(g) of the Securities Purchase
Agreement, the Conversion Price shall be amended to be equal to (i) 90% of (ii)
the Conversion Price determined in accordance with the other provisions of this
Debenture without regard to this Section 4(E), and the Holder may require the
Company to immediately redeem the outstanding portion of this Debenture in
accordance with clause (y) of Section 6 hereof.

         5. A. (i) Notwithstanding any other provision hereof to the contrary,
at any time prior to the Conversion Date, the Company shall have the right to
redeem (a "Redemption") all or any portion of the then outstanding principal
amount of the Debentures then held by the Holder in cash for an amount (the
"Redemption Amount") equal to (x) the Applicable Redemption Percentage (as
defined below) of the outstanding principal of such Debenture being redeemed (y)
plus all accrued but unpaid interest thereon through the date the Redemption
Amount is paid to the Holder (the "Redemption Payment Date").

               (ii) If the Company elects to make a Redemption, the Company
shall give written notice thereof to the Holder (the "Notice of Redemption").
The Redemption Payment Date shall be the date which is seven (7) business days
after the Holder's receipt of the Notice of Redemption. Anything in the other
provisions of this Debenture, including, but not limited to the preceding
provisions of this Section 5, to the contrary notwithstanding, with respect to
any Debentures for which a Notice of Redemption is given, the Holder shall have
the right, exercisable by giving a Notice of Conversion submitted to the Company
within five (5) business days of the Holder's receipt of the Company's Notice of
Redemption, to convert any or all of the Debentures sought to be redeemed (a
"Redemption Notice Conversion") and the Redemption Notice Conversion shall take
precedence over the redemption contemplated by the Notice of Redemption. Such
Debentures shall be converted in accordance with the terms hereof.

               (iii) The Redemption Amount shall, unless otherwise agreed to
in writing by the Holder after receiving the Notice of Redemption, be paid
to the Holder by wire transfer of good funds on the Redemption Payment
Date.

               (iv) In the event payment of the Redemption Amount is not timely
made, the Holder shall have the right, in the Holder's sole discretion, to
determine that (i) any rights of the Company to redeem outstanding Debentures
shall terminate, and/or (ii) the Notice of Redemption shall be null and void.

                                       4
<PAGE>   5

                           (v) The "Applicable Redemption Percentage" means, if
the Redemption Payment Date is (x) not more than one hundred twenty (120) days
after the Closing Date, one hundred twenty-three and thirty-three one hundredths
percent (123.33%); (y) more than one hundred twenty (120) but not more than one
hundred eighty (180) days after the Closing Date, one hundred twenty-eight and
thirty-three one hundredths percent (128.33%); and (z) more than one hundred
eighty (180) days after the Closing Date, one hundred thirty-three and
thirty-three one hundredths percent (133.33%).

         6. The Holder recognizes that the Company may be limited in the number
of shares of Common Stock it may issue by (X) reason of its authorized shares,
or (Y) the applicable rules and regulations of the principal securities market
on which the Common Stock is listed or traded (collectively, the "Cap
Regulations"). Without limiting the other provisions hereof, (i) the Company
will take all steps reasonably necessary to be in a position to issue shares of
Common Stock on conversion of the Debentures without violating the Cap
Regulations and (ii) if, despite taking such steps, the Company still can not
issue such shares of Common Stock without violating the Cap Regulations, the
Holder of this Debenture (to the extent the same can not be converted in
compliance with the Cap Regulations (an "Unconverted Debenture"), shall have the
option, exercisable in the Holder's sole and absolute discretion, to elect any
one of the following remedies:

                  (x) if permitted by the Cap Regulations, require the Company
         to issue shares of Common Stock in accordance with such Holder's Notice
         of Conversion relating to the Unconverted Debenture at a conversion
         purchase price equal to the average of the closing bid price per share
         of Common Stock for any five (5) consecutive trading days (subject to
         the equitable adjustments for certain events occurring during such
         period as provided in this Debenture) during the sixty (60) trading
         days immediately preceding the date of the Notice of Conversion; or

                  (y) require the Company to redeem each Unconverted Debenture
         for an amount (the "Redemption Amount"), payable in cash, equal to the
         sum of (i) one hundred thirty-three and thirty-three one hundredths
         percent (133.33%) of the principal of an Unconverted Debenture, plus
         (ii) any accrued but unpaid interest thereon through and including the
         date (the "Redemption Date") on which the Redemption Amount is paid to
         the Holder.

The holder of an Unconverted Debenture may elect one of the above remedies with
respect to a portion of such Unconverted Debenture and the other remedy with
respect to other portions of the Unconverted Debenture. Anything herein to the
contrary notwithstanding, the remedy contained in clause (x) or (y) of this
Section 6 shall not be available to the Holder until after the earlier of (i)
the Company's Annual Meeting of Shareholders during calendar year 2001 or
earlier special meeting of shareholders held after the Initial Closing Date,
(ii) two hundred ten (210) days after the date hereof, or (iii) the expiration
of sixty (60) days from the date a holder of any of the Debentures in this
series has exercised a right pursuant to which the last share of

                                       5
<PAGE>   6

Common Stock issuable under the Cap Regulations is to be issued. If prior to
such date, the Cap Regulations no longer apply to limit the Company's issuance
of shares of Common Stock in connection with the Securities or the transactions
contemplated by the Transaction Agreements, the remedies contained clauses (x)
and (y) of this Section 6 shall not be exercisable by the Holder.

         7. Subject to the terms of the Securities Purchase Agreement, no
provision of this Debenture shall alter or impair the obligation of the Company,
which is absolute and unconditional, to pay the principal of, and interest on,
this Debenture at the time, place, and rate, and in the coin or currency, herein
prescribed. This Debenture and all other Debentures now or hereafter issued of
similar terms are direct obligations of the Company.

         8. A. The obligations of the Company under this Debenture are secured
under the terms of the Securities Purchase Agreement, including, but not
necessarily limited to, the provisions of Section 4(i) thereof and Annex VII
thereto.

            B. No recourse shall be had for the payment of the principal
of, or the interest on, this Debenture, or for any claim based hereon, or
otherwise in respect hereof, against any incorporator, shareholder, officer or
director, as such, past, present or future, of the Company, whether by virtue of
any constitution, statute or rule of law, or by the enforcement of any
assessment or penalty or otherwise, all such liability being, by the acceptance
hereof and as part of the consideration for the issue hereof, expressly waived
and released. This Debenture is a recourse obligation of the Company.

         9. If the Company merges or consolidates with another corporation or
sells or transfers all or substantially all of its assets to another person and
the holders of the Common Stock are entitled to receive stock, securities or
property in respect of or in exchange for Common Stock, then as a condition of
such merger, consolidation, sale or transfer, the Company and any such
successor, purchaser or transferee agree that the Debenture may thereafter be
converted on the terms and subject to the conditions set forth above into the
kind and amount of stock, securities or property receivable upon such merger,
consolidation, sale or transfer by a holder of the number of shares of Common
Stock into which this Debenture might have been converted immediately before
such merger, consolidation, sale or transfer, subject to adjustments which shall
be as nearly equivalent as may be practicable. In the event of any proposed
merger, consolidation or sale or transfer of all or substantially all of the
assets of the Company (a "Sale"), the Holder hereof shall have the right to
convert by delivering a Notice of Conversion to the Company within fifteen (15)
days of receipt of notice of such Sale from the Company. In the event the Holder
hereof shall elect not to convert, the Company may prepay all outstanding
principal and accrued interest on this Debenture by paying the Redemption Amount
contemplated by Section 5(A) hereof, less all amounts required by law to be
deducted, upon which tender of payment following such notice, the right of
conversion shall terminate.

                                       6
<PAGE>   7

         10. If, for any reason, prior to the Conversion Date or the Redemption
Payment Date, the Company spins off or otherwise divests itself of a part of its
business or operations or disposes all or of a part of its assets in a
transaction (the "Spin Off") in which the Company does not receive compensation
for such business, operations or assets, but causes securities of another entity
(the "Spin Off Securities") to be issued to security holders of the Company,
then the Company shall cause (i) to be reserved Spin Off Securities equal to the
number thereof which would have been issued to the Holder had all of the
Holder's Debentures outstanding on the record date (the "Record Date") for
determining the amount and number of Spin Off Securities to be issued to
security holders of the Company (the "Outstanding Debentures") been converted as
of the close of business on the trading day immediately before the Record Date
(the "Reserved Spin Off Shares"), and (ii) to be issued to the Holder on the
conversion of all or any of the Outstanding Debentures, such amount of the
Reserved Spin Off Shares equal to (x) the Reserved Spin Off Shares multiplied by
(y) a fraction, of which (I) the numerator is the principal amount of the
Outstanding Debentures then being converted, and (II) the denominator is the
principal amount of the Outstanding Debentures.

         11. If, at any time while any portion of this Debenture remains
outstanding, the Company effectuates a stock split (but not a reverse stock
split) of its Common Stock or issues a dividend on its Common Stock consisting
of shares of Common Stock, the Fixed Conversion Price shall be equitably
adjusted to reflect such action. By way of illustration, and not in limitation,
of the foregoing, (i) if the Company effectuates a 2:1 split of its Common
Stock, thereafter, with respect to any conversion for which the Company issues
the shares after the record date of such split, the Fixed Conversion Price shall
be deemed to be one-half of what it had been calculated to be immediately prior
to such split; and (ii) if the Company declares a stock dividend of one share of
Common Stock for every 10 shares outstanding, thereafter, with respect to any
conversion for which the Company issues the shares after the record date of such
dividend, the Fixed Conversion Price shall be deemed to be the amount of such
Fixed Conversion Price calculated immediately prior to such record date
multiplied by a fraction, of which the numerator is the number of shares (10)
for which a dividend share will be issued and the denominator is such number of
shares plus the dividend share(s) issuable or issued thereon (11).

         12. All payments contemplated hereby to be made "in cash" shall be made
in immediately available good funds in such coin or currency of the United
States of America as at the time of payment is legal tender for payment of
public and private debts. All payments of cash and each delivery of shares of
Common Stock issuable to the Holder as contemplated hereby shall be made by wire
transfer to the account designated by the Holder or, if no such account is
designated, at the address last appearing on the Debenture Register of the
Company as designated in writing by the Holder from time to time; except that
the Holder can designate, by notice to the Company, a different account or
delivery address for any one or more specific or for all remaining payments or
deliveries.

                                       7
<PAGE>   8

         13. The Holder of the Debenture, by acceptance hereof, agrees that this
Debenture is being acquired for investment and that such Holder will not offer,
sell or otherwise dispose of this Debenture or the Shares of Common Stock
issuable upon conversion thereof except under circumstances which will not
result in a violation of the Act or any applicable state Blue Sky or foreign
laws or similar laws relating to the sale of securities.

         14. This Debenture shall be governed by and construed in accordance
with the laws of the State of New York. Each of the parties consents to the
jurisdiction of the federal courts whose districts encompass any part of the
City of New York or the state courts of the State of New York sitting in the
City of New York in connection with any dispute arising under this Debenture and
hereby waives, to the maximum extent permitted by law, any objection, including
any objection based on forum non coveniens, to the bringing of any such
proceeding in such jurisdictions. To the extent determined by such court, the
Company shall reimburse the Holder for any reasonable legal fees and
disbursements incurred by the Holder in enforcement of or protection of any of
its rights under any of this Debenture.

         15. The following shall constitute an "Event of Default":

                  a.       The Company shall default in the payment of principal
                           or interest on this Debenture and same shall continue
                           for a period of five (5) days after notice thereof
                           from or on behalf of the Holder; or

                  b.       Any of the representations or warranties made by the
                           Company herein, in the Securities Purchase Agreement,
                           or in any of the other Transaction Agreements or in
                           any certificate or financial or other written
                           statements heretofore or hereafter furnished by the
                           Company in connection with the execution and delivery
                           of this Debenture or the Securities Purchase
                           Agreement shall be false or misleading in any
                           material respect at the time made; or

                  c.       The Company fails to issue shares of Common Stock to
                           the Holder or to cause its Transfer Agent to issue
                           shares of Common Stock upon exercise by the Holder of
                           the conversion rights of the Holder in accordance
                           with the terms of this Debenture, fails to transfer
                           or to cause its Transfer Agent to transfer any
                           certificate for shares of Common Stock issued to the
                           Holder upon conversion of this Debenture and when
                           required by this Debenture and such transfer is
                           otherwise lawful, or fails to remove any restrictive
                           legend or to cause its Transfer Agent to transfer on
                           any certificate or any shares of Common Stock issued
                           to the Holder upon conversion of this Debenture as
                           and when required by this Debenture, the Securities
                           Purchase Agreement or the Registration Rights
                           Agreement and such legend removal is otherwise
                           lawful, and any such failure shall

                                       8
<PAGE>   9

                           continue uncured for five (5) business days after
                           written notice from the Holder of such failure; or

                  d.       The Company shall fail to perform or observe, in any
                           material respect, any other covenant, term,
                           provision, condition, agreement or obligation of any
                           Debenture in this series and such failure shall
                           continue uncured for a period of thirty (30) days
                           after written notice from the Holder of such failure;
                           or

                  e.       The Company shall fail to perform or observe, in any
                           material respect, any covenant, term, provision,
                           condition, agreement or obligation of the Company
                           under the Securities Purchase Agreement or the
                           Registration Rights Agreement and such failure shall
                           continue uncured for a period of thirty (30) days
                           after written notice from the Holder of such failure
                           (other than a failure to cause the Registration
                           Statement to become effective no later than the
                           Required Effective Date, as defined and provided in
                           the Registration Rights Agreement, as to which no
                           such cure period shall apply); or

                  f.       The Company shall (1) admit in writing its inability
                           to pay its debts generally as they mature; (2) make
                           an assignment for the benefit of creditors or
                           commence proceedings for its dissolution; or (3)
                           apply for or consent to the appointment of a trustee,
                           liquidator or receiver for its or for a substantial
                           part of its property or business; or

                  g.       A trustee, liquidator or receiver shall be appointed
                           for the Company or for a substantial part of its
                           property or business without its consent and shall
                           not be discharged within sixty (60) days after such
                           appointment; or

                  h.       Any governmental agency or any court of competent
                           jurisdiction at the instance of any governmental
                           agency shall assume custody or control of the whole
                           or any substantial portion of the properties or
                           assets of the Company and shall not be dismissed
                           within sixty (60) days thereafter; or

                  i.       Any money judgment, writ or warrant of attachment, or
                           similar process in excess of Fifty Thousand ($50,000)
                           Dollars in the aggregate shall be entered or filed
                           against the Company or any of its properties or other
                           assets and shall remain unpaid, unvacated, unbonded
                           or unstayed for a period of sixty (60) days or in any
                           event later than five (5) days prior to the date of
                           any proposed sale thereunder; or

                  j.       Bankruptcy, reorganization, insolvency or liquidation
                           proceedings or other proceedings for relief under any
                           bankruptcy law or any law for the relief

                                       9
<PAGE>   10

                           of debtors shall be instituted by or against the
                           Company and, if instituted against the Company, shall
                           not be dismissed within sixty (60) days after such
                           institution or the Company shall by any action or
                           answer approve of, consent to, or acquiesce in any
                           such proceedings or admit the material allegations
                           of, or default in answering, a petition filed in any
                           such proceeding; or

                  k.       The Company shall have its Common Stock suspended or
                           delisted from an exchange or over-the-counter market
                           from trading for in excess of five (5) trading days.

Then, or at any time thereafter, and in each and every such case, unless such
Event of Default shall have been waived in writing by the Holder (which waiver
shall not be deemed to be a waiver of any subsequent default) at the option of
the Holder and in the Holder's sole discretion, the Holder may consider this
Debenture immediately due and payable, without presentment, demand, protest or
notice of any kinds, all of which are hereby expressly waived, anything herein
or in any note or other instruments contained to the contrary notwithstanding,
and the Holder may immediately enforce any and all of the Holder's rights and
remedies provided herein or any other rights or remedies afforded by law.

         16. Nothing contained in this Debenture shall be construed as
conferring upon the Holder the right to vote or to receive dividends or to
consent or receive notice as a shareholder in respect of any meeting of
shareholders or any rights whatsoever as a shareholder of the Company, unless
and to the extent converted in accordance with the terms hereof.

         17. In the event for any reason, any payment by or act of the Company
or the Holder shall result in payment of interest which would exceed the limit
authorized by or be in violation of the law of the jurisdiction applicable to
this Debenture, then ipso facto the obligation of the Company to pay interest or
perform such act or requirement shall be reduced to the limit authorized under
such law, so that in no event shall the Company be obligated to pay any such
interest, perform any such act or be bound by any requirement which would result
in the payment of interest in excess of the limit so authorized. In the event
any payment by or act of the Company shall result in the extraction of a rate of
interest in excess of a sum which is lawfully collectible as interest, then such
amount (to the extent of such excess not returned to the Company) shall, without
further agreement or notice between or by the Company or the Holder, be deemed
applied to the payment of principal, if any, hereunder immediately upon receipt
of such excess funds by the Holder, with the same force and effect as though the
Company had specifically designated such sums to be so applied to principal and
the Holder had agreed to accept such sums as an interest-free prepayment of this
Debenture. If any part of such excess remains after the principal has been paid
in full, whether by the provisions of the preceding sentences of this Section 17
or otherwise, such excess shall be deemed to be an interest-free loan from the
Company to the Holder, which loan shall be payable immediately upon demand by
the

                                       10
<PAGE>   11

Company. The provisions of this Section 17 shall control every other provision
of this Debenture.

         18. This Debenture amends the Company's 6% Secured Convertible
Debenture Due June 7, 2002, dated June 7, 2000, issued to Sherman LLC, in the
original principal amount of US$4,353,652.00, and as so amended, is a
restatement of that Debenture.

                                       11
<PAGE>   12
         IN WITNESS WHEREOF, the Company has caused this instrument to be duly
executed by an officer thereunto duly authorized.

Dated: January 25, 2001

                                      CORZON, INC., formerly known as
                                      TANNER'S RESTAURANT GROUP, INC.

                                      By:    /s/ Lawrence Shatsoff
                                      Name:  Lawrence Shatsoff
                                      Title: President

The undersigned acknowledges security interest associated with this Debenture.

B4B COMMUNICATIONS, LTD.

By:    /s/ Lawrence Shatsoff
Name:  Lawrence Shatsoff
Title: Vice President

<PAGE>   13

                                    EXHIBIT A

                              NOTICE OF CONVERSION

   (To be Executed by the Registered Holder in order to Convert the Debenture)

         The undersigned hereby irrevocably elects to convert $______________
of the principal amount of the Secured Convertible Debenture No._____________
(the "Debenture") of CORZON, INC. (the "Company") into Shares of Common
Stock of the Company according to the conditions of the Debenture, as of the
date written below.

Conversion Date*

Applicable Conversion Price

Signature

                            [Name]

Address:

*If this conversion converts the entire remaining principal of this Debenture,
the original Debenture must be received by the Company by the fifth business
date following the Conversion Date.

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