Document:

<PAGE>   1
                                                                    EXHIBIT 10.4

          CONSENT AND AMENDMENT NO. 1 TO CREDIT AND SECURITY AGREEMENT

         THIS CONSENT AND AMENDMENT NO. 1 (this "AMENDMENT"), dated as of August
2, 2000, is entered into by and among LANIER LEASE FUNDING LLC, a Delaware
limited liability company (the "BORROWER"), LANIER WORLDWIDE, INC., a Delaware
corporation, as guarantor of the Servicer's performance under the Performance
Guaranty, LANIER LEASE RECEIVABLES LLC, a Delaware limited liability company, as
guarantor under the Secured Guaranty, LANIER COLLECTIONS LIMITED PARTNERSHIP, a
Delaware limited partnership, as initial Servicer, BLUE RIDGE ASSET FUNDING
CORPORATION, a Delaware corporation, FALCON ASSET SECURITIZATION CORPORATION, a
Delaware corporation, WACHOVIA BANK, N.A., a national banking association,
individually and as Blue Ridge Agent, and BANK ONE, NA, a national banking
association with its main office in Chicago, Illinois, individually and as
Falcon Agent and Administrative Agent, with respect to that certain Credit and
Security Agreement dated as of June 7, 2000 by and among the parties (the
"EXISTING AGREEMENT" which, as amended hereby, is hereinafter referred to as the
"AGREEMENT"). CAPITALIZED TERMS USED AND NOT OTHERWISE DEFINED HEREIN SHALL HAVE
THE MEANINGS ATTRIBUTED THERETO IN THE EXISTING AGREEMENT.

                              W I T N E S S E T H :

         WHEREAS, the Borrower wishes to amend and restate its Organic Documents
as set forth in Annexes A and B hereto, and has requested that the Co-Agents
consent to such amendment; and

         WHEREAS, the parties wish to amend the Existing Agreement as
hereinafter set forth.

         NOW, THEREFORE, in consideration of the premises and the mutual
agreements herein contained, and for other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the parties hereto
hereby agree as follows:

         1.       AMENDMENTS. Subject to the terms and conditions hereinafter
set forth, the parties hereby agree to amend the Existing Agreement as follows:

         1.1.     The following definitions are hereby amended and restated in
their entirety to read as follows:

         Aggregate Commitment: The aggregate of the Commitments of the Liquidity
    Banks, as reduced or increased from time to time pursuant to the terms
    hereof.

         Funding Percentage: (a) With respect to Blue Ridge and its Liquidity
    Banks in the aggregate, 52.63158%, and (b) with respect to Falcon and its
    Liquidity Banks in the aggregate, 47.36842%, as each of the foregoing
    percentages may be adjusted from time to time pursuant to Section 1.7.

<PAGE>   2

         Lanier Credit Event: The occurrence of the following:

         (a) any "Default" shall occur under the Bank Facilities;

         (b) Lanier shall fail to maintain as of the end of each fiscal quarter
    set forth below a ratio of (i) EBITDAR for the four fiscal quarter period
    then ending to (ii) Interest Expense plus Rentals for such period of not
    less than the ratio set forth below opposite such period:

<TABLE>
<CAPTION>
            FISCAL QUARTER ENDING                                RATIO
        ----------------------------                             -----
        <S>                                                      <C>
        12/31/1999 through 6/30/2000                              2.25

        7/1/2000 through 6/29/2001                                1.85

        6/30/2001 through 6/28/2002                               2.15

        6/29/2002 through 6/27/2003                               2.25

        6/28/2003 through 7/2/2004                                2.50

        7/3/2004 and thereafter                                   3.00
</TABLE>

         (c) Lanier shall fail to maintain as of the end of each fiscal quarter
    set forth below a Leverage Ratio for the four fiscal quarter period then
    ending of not greater than the ratio set forth below opposite such period:

<TABLE>
<CAPTION>
            FISCAL QUARTER ENDING                                RATIO
        -----------------------------                            -----
        <S>                                                      <C>
        12/31/1999 through 12/31/2000                             4.00

        1/1/2001 through 3/30/2001                                3.85

        3/31/2001 through 6/29/2001                               3.60

        6/30/2001 through 6/28/2002                               3.25

        6/29/2002 through 6/27/2003                               3.00

        6/28/2003 through 7/2/2004                                2.50

        7/3/2004 and thereafter                                   2.00
</TABLE>

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         (d) Lanier permits its Consolidated Net Worth at any time to be less
    than the sum of (i) $146,882,000, plus (ii) 50% of Net Income (if positive)
    calculated separately for (A) the remainder of the quarterly accounting
    period in which August 2, 2000 occurred, and (B) each subsequent quarterly
    accounting period, in each case, excluding changes in cumulative foreign
    exchange translation adjustment, restructuring charges for the fiscal
    quarter ended June 30, 2000 (in an aggregate amount not to exceed
    $35,000,000) and, from and after July 1, 2000, one-time gains on the sale of
    any portion of Lanier's business (in an aggregate amount up to the amount of
    the restructuring charges excluded by the preceding phrase).

         Receivable: Any right to payment arising from the lease of Owned Goods,
    the sale of supplies and/or the provision of services for such office
    equipment by the Originator, including, without limitation, the right to
    payment of any interest or finance charges and other amounts with respect
    thereto, which is purported to be sold or contributed under any of the Sale
    Agreements, but excluding (I) any Excluded Dictation Receivable, AND (II)
    ANY RENTAL PAYMENT, PER-COPY "CLICK" CHARGE OR OTHER AMOUNT BOOKED ON THE
    ORIGINATOR'S LEGACY BAM ACCOUNTING SYSTEM WITH AN INVOICE CODE OF "RSX" OR
    "XSX." Rights to payment arising from any one transaction, including,
    without limitation, rights to payment represented by an individual invoice,
    shall constitute a Receivable separate from a Receivable consisting of the
    rights to payment arising from any other transaction or evidenced by any
    other invoice; provided, however, any right to payment referred to in this
    sentence shall be a Receivable regardless of whether the account debtor, the
    Originator, LLR LLC or the Borrower treats such right to payment as a
    separate payment obligation.

         1.2. Bank One's Commitment is hereby reduced to $90,000,000.

         1.3. The definition of "ELIGIBLE RECEIVABLE" is hereby amended (a) to
insert before the colon after "At any time" at the beginning of such definition
", a Receivable as to which each of the following is true", (b) to change the
word "lease" in clause (a) of such definition to "finance lease", (c) to delete
the word "and" at the end of clause (m) thereof, (d) to change the period at the
end of clause (n) thereof to a semicolon, and (e) to insert the following new
clauses (o) and (p) after clause (n):

         (o) if such Receivable arises from a finance lease of office equipment
    purchased from HP: (i) more than 30 days have elapsed since the Originator
    leased such office equipment to an Obligor, and (ii) on or before September
    7, 2000, the Borrower has delivered to the Administrative Agent a letter (in
    a form reasonably acceptable to the Co-Agents) from HP addressed to the
    Administrative Agent, on behalf of the Agents and the Lenders (or expressly
    stating that the Agents and the Lenders are permitted to rely thereon)
    confirming that HP's security interest in HP goods that have been delivered
    to the Originator (or one of its Affiliates) is limited to such goods that
    have not yet been purchased and paid for by the Originator and the proceeds
    of any sale thereof, does not extend to any

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    HP goods once the Originator pays the purchase price therefor or to any of
    the Receivables arising from the lease thereof, and would not permit HP to
    repossess such goods from any lessee thereof; and

         (p) a Receivable that arises from a finance lease which is booked on
    either (i) the Originator's Legacy BAM accounting system with an invoice
    code of "MSX", or (ii) the Originator's Infolease accounting system.

         1.4. Section 1.3(a) of the Existing Agreement is hereby amended to
delete "On the fifth Business Day immediately preceding each Settlement Date"
where it appears and to substitute in lieu thereof "On or before the third
Business Day immediately preceding each Settlement Date".

         1.5. Section 1.3(b) of the Existing Agreement is hereby amended to
delete "2.00%" where it appears and to substitute in lieu thereof "3.25%."

         1.6. Section 2.5(c) of the Existing Agreement is hereby amended and
restated in its entirety to read as follows:

         (c) Method of Computation. All computations of interest, Servicer's
    Fee, per annum fees payable under Section 4.1 and any other per annum fees
    payable by the Borrower to the Lenders, the Servicer or the Co-Agents under
    the Transaction Documents shall be made on the basis of a year of 360 days
    for the actual number of days (including, except as otherwise provided in
    the Fee Letters, the first day but excluding the last day) elapsed.

         1.7. Section 7.1(c) of the Existing Agreement is hereby amended and
restated in its entirety to read as follows:

         (c) Audits. Each Loan Party will, at such Loan Party's expense but not
    more frequently than five (5) times in any calendar year (unless a
    Liquidation Event has occurred and is continuing, or either of the Co-Agents
    believes in good faith that a Liquidation Event has occurred and is
    continuing, in which case no such limitation shall apply): (i) at any time
    and from time to time upon not less than five (5) Business Days' notice
    (unless a Liquidation Event has occurred and is continuing (or either of the
    Co-Agents believes in good faith that a Liquidation Event has occurred and
    is continuing), in which case no such notice shall be required) during
    regular business hours, permit the Administrative Agent, the Co-Agents
    and/or any of their agents or representatives, (A) to examine and make
    copies of and abstracts from all books, records and documents (including,
    without limitation, computer tapes and disks) in the possession or under the
    control of such Loan Party relating to Receivables, including, without
    limitation, the related Contracts and purchase orders and other agreements,
    and (B) to visit the offices and properties of such Loan Party for the
    purpose of examining such materials described in clause (i)(A) next above,
    and to discuss matters relating to Receivables or such Loan Party's
    performance hereunder with any of the officers or employees of such Loan
    Party having knowledge of such matters; (ii) permit

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    the Administrative Agent, the Co-Agents and/or any of their agents or
    representatives, upon not less than five (5) Business Days' notice from
    either Co-Agent (unless a Liquidation Event has occurred and is continuing
    (or either Co-Agent believes in good faith that a Liquidation Event has
    occurred and is continuing) in which case no such notice shall be required),
    to meet with the independent auditors of such Loan Party, to review such
    auditors' work papers and otherwise to review with such auditors the books
    and records of such Loan Party with respect to the Receivables and Related
    Assets; and (iii) without limiting the provisions of clause (i) or (ii)
    above, from time to time, at the expense of such Loan Party, permit
    certified public accountants or other auditors acceptable to the Co-Agents
    to conduct a review of such Loan Party's books and records with respect to
    the Receivables and Related Assets; PROVIDED, HOWEVER, that all reviews,
    visits and audits conducted pursuant to this Section 7.1(c) (each, a
    "REVIEW") at any Loan Party's premises prior to the occurrence of a
    Liquidation Event shall be limited to an aggregate of 15 weeks in each
    calendar year, and the number of Persons who are not employees of either
    Co-Agent who visit any Loan Party's premises in connection with any such
    Review shall be limited to 4 per Review.

         1.8. Section 7.3(c) of the Existing Agreement is hereby amended to add
the following sentence at the end thereof:

         Notwithstanding any broader powers that may now or hereafter be granted
    to the Borrower in its Organic Documents, in no event shall the Borrower
    engage in any business other than (i) the acquisition, financing and/or
    servicing of Receivables under the Transaction Documents, and (ii)
    investments of the Borrower's excess cash in: (A) marketable obligations of
    the United States of America, the full and timely payment of which are
    backed by the full faith and credit of the United States of America and
    which have a maturity of not more than 270 days from the date of
    acquisition; (B) marketable obligations, the full and timely payment of
    which are directly and fully guaranteed by the full faith and credit of the
    United States of America and which have a maturity of not more than 270 days
    from the date of acquisition; (C) bankers' acceptances and certificates of
    deposit and other interest-bearing obligations (in each case having a
    maturity of not more than 270 days from the date of acquisition) denominated
    in dollars and issued by any bank with capital, surplus and undivided
    profits aggregating at least $50,000,000, the short-term obligations of
    which are rated at least A-1 by S&P and P-1 by Moody's; (D) repurchase
    obligations with a term of not more than ten days for underlying securities
    of the types described in clauses (A), (B) and (C) above entered into with
    any bank of the type described in clause (C) above; (E) commercial paper
    rated at least A-1 by S&P and P-1 by Moody's; and (F) demand deposits, time
    deposits or certificates of deposit (having original maturities of no more
    than 365 days) of depository institutions or trust companies incorporated
    under the laws of the United States of America or any state thereof (or
    domestic branches of any foreign bank) and subject to supervision and
    examination by federal or state banking or depository institution
    authorities; provided, however, that at the time such investment, or the
    commitment to make such investment, is

                                      B-5

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    entered into, the short-term debt rating of such depository institution or
    trust company shall be at least A-1 by S&P and P-1 by Moody's.

         1.9. Sections 10.1(z), 10.1(aa) and 10.1(bb) of the Existing Agreement
are hereby deleted in their entirety.

         2. CONSENT. Each of the Co-Agents hereby consents to (a) the amendment
and restatement of each of the Borrower's Organic Documents in the forms set
forth in Annexes A and B hereto, and (b) a pledge of Lanier's membership
interests in the Guarantor to secure its obligations under the Bank Facilities;
PROVIDED, HOWEVER, that nothing herein shall be deemed to be a waiver of any
Change in Control that will arise if the agent(s) under the Bank Facilities
realize upon such pledged membership interests.

         3. REPRESENTATIONS.

         3.1. Each of the Loan Parties represents and warrants to the Lenders
and the Agents that it has duly authorized, executed and delivered this
Amendment and that the Agreement constitutes, a legal, valid and binding
obligation of such Loan Party, enforceable in accordance with its terms (except
as enforceability may be limited by applicable bankruptcy, insolvency, or
similar laws affecting the enforcement of creditors' rights generally or by
equitable principles relating to enforceability).

         3.2. Each of the Loan Parties further represents and warrants to the
Lenders and the Agents that each of its representations and warranties set forth
in Section 6.1 of the Agreement is true and correct as of the date hereof and
that no Event of Default or Unmatured Default exists as of the date hereof and
is continuing.

         4. CONDITIONS PRECEDENT. This Amendment shall become effective as of
the date first above written upon satisfaction of each of the following
conditions precedent:

         (a) receipt by the Administrative Agent of a counterpart of this
    Amendment, duly executed by each of the parties hereto;

         (b) receipt by the Falcon Agent of an amendment to the Falcon Fee
    Letter, duly executed by each of the parties thereto, together with payment
    of the "Amendment Fee" under and as defined therein;

         (c) receipt by the Blue Ridge Agent of an amendment to the Blue Ridge
    Fee Letter, duly executed by each of the parties thereto, together with
    payment of the "Amendment Fee" under and as defined therein; and

         (d) receipt by Administrative Agent of faxed copies of amendments to
    each of the Bank Facilities, duly executed by Lanier and the requisite
    lenders and agents thereunder, amending, among other things, the financial
    covenants contained in the Bank Facilities to conform to the amendment and
    restatement of "LANIER CREDIT EVENT" contained in this Amendment and
    securing Lanier's obligations under the Bank Facilities with assets other
    than the Collateral.

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         5. MISCELLANEOUS.

         5.1. Except as expressly amended hereby, the Existing Agreement shall
remain unaltered and in full force and effect, and each of the parties hereby
ratifies and confirms the Agreement and each of the other Transaction Documents
to which it is a party.

         5.2. THIS AMENDMENT SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE
WITH, THE INTERNAL LAWS OF THE STATE OF NEW YORK WITHOUT REFERENCE TO PRINCIPLES
OF CONFLICTS OF LAW.

         5.3. EACH PARTY HERETO HEREBY ACKNOWLEDGES AND AGREES THAT:

         5.3.1. SUCH PARTY EXPRESSLY WAIVES ANY RIGHT, TO THE EXTENT PERMITTED
    BY APPLICABLE LAW, TO A TRIAL BY JURY IN ANY ACTION OR PROCEEDING TO ENFORCE
    OR DEFEND ANY RIGHTS UNDER THE AGREEMENT, ANY OTHER TRANSACTION DOCUMENT OR
    UNDER ANY AMENDMENT, INSTRUMENT OR DOCUMENT DELIVERED OR WHICH MAY IN THE
    FUTURE BE DELIVERED IN CONNECTION HEREWITH OR ARISING FROM ANY BANKING OR
    OTHER RELATIONSHIP EXISTING IN CONNECTION WITH THE AGREEMENT OR ANY OTHER
    TRANSACTION DOCUMENT AND AGREES THAT ANY SUCH ACTION OR PROCEEDING SHALL NOT
    BE TRIED BEFORE A JURY.

         5.3.2. TO THE EXTENT THAT IT HAS OR HEREAFTER MAY ACQUIRE ANY IMMUNITY
    FROM THE JURISDICTION OF ANY COURT OR FROM ANY LEGAL PROCESS (WHETHER
    THROUGH SERVICE OR NOTICE, ATTACHMENT PRIOR TO JUDGMENT, ATTACHMENT IN AID
    TO EXECUTION, EXECUTION OR OTHERWISE) WITH RESPECT TO ITSELF OR ITS
    PROPERTY, IT HEREBY IRREVOCABLY WAIVES SUCH IMMUNITY IN RESPECT OF ITS
    OBLIGATIONS UNDER OR IN CONNECTION WITH THE AGREEMENT.

         5.3.3. IT IRREVOCABLY (i) SUBMITS TO THE JURISDICTION, FIRST, OF ANY
    UNITED STATES FEDERAL COURT, AND SECOND, IF FEDERAL JURISDICTION IS NOT
    AVAILABLE, OF ANY NEW YORK STATE COURT, AS APPROPRIATE, IN EITHER CASE
    SITTING IN NEW YORK COUNTY, NEW YORK, AS APPROPRIATE IN ANY ACTION OR
    PROCEEDING ARISING OUT OF OR RELATING TO THE AGREEMENT, (ii) AGREES THAT ALL
    CLAIMS IN RESPECT OF SUCH ACTION OR PROCEEDING MAY BE HEARD AND DETERMINED
    ONLY IN SUCH NEW YORK STATE OR FEDERAL COURT AND NOT IN ANY OTHER COURT, AND
    (iii) WAIVES, TO THE FULLEST EXTENT IT MAY EFFECTIVELY DO SO, THE DEFENSE OF
    AN INCONVENIENT FORUM TO THE MAINTENANCE OF SUCH ACTION OR PROCEEDING.

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         5.4. This Amendment may be executed in any number of counterparts and
by the different parties hereto in separate counterparts, each of which when so
executed shall be deemed to be an original and all of which when taken together
shall constitute one and the same agreement.

         IN WITNESS WHEREOF, the parties hereto have executed this Amendment as
of the date first above written.

                                LANIER LEASE FUNDING LLC, as the Borrower

                                By:
                                   ---------------------------------------------

                                Title:
                                      ------------------------------------------

                                LANIER WORLDWIDE, INC., as Guarantor of the
                                   Servicer's Performance

                                By:
                                   ---------------------------------------------

                                Title:
                                      ------------------------------------------

                                LANIER LEASE RECEIVABLES LLC, as Guarantor

                                By:
                                   ---------------------------------------------

                                Title:
                                      ------------------------------------------

                                LANIER COLLECTIONS LIMITED
                                   PARTNERSHIP, as the initial Servicer

                                By:
                                   ---------------------------------------------

                                Title:
                                      ------------------------------------------

                                      B-7
<PAGE>   9

                              BANK ONE, NA, individually as a Liquidity Bank to
                                 Falcon, as the Falcon Agent and as the
                                 Administrative Agent

                              By:
                                 -----------------------------------------------
                                 Julie C. Benda, Vice President

                                 Commitment:  $90,000,000.00

                              FALCON ASSET SECURITIZATION
                                  CORPORATION, as a Conduit

                              By:
                                 -----------------------------------------------
                                 Julie C. Benda, Authorized Signatory

                                      B-8
<PAGE>   10

                              BLUE RIDGE ASSET FUNDING CORPORATION,
                              as a Conduit

                              BY:  WACHOVIA BANK, N.A., ITS ATTORNEY-IN-FACT

                              By:
                                 -----------------------------------------------
                                 Victoria A. Dudley, Senior Vice President

                              WACHOVIA BANK, N.A., individually as a Liquidity
                                  Bank to Blue Ridge and as the Blue Ridge Agent

                              By:
                                 -----------------------------------------------
                                 Victoria A. Dudley, Senior Vice President

                                 Commitment:  $100,000,000.00

                                      B-9<PAGE>   1
                                                                   Exhibit 10.51

                                SECOND AMENDMENT

                              VERILINK CORPORATION
                   AMENDED AND RESTATED 1993 STOCK OPTION PLAN

         VERILINK CORPORATION, a corporation organized and existing under the
laws of the State of Delaware with its principal place of business in
Huntsville, Alabama, (the "Company") hereby adopts and publishes on this the
10th day of August, 2000 this Amendment to the Verilink Corporation Amended and
Restated 1993 Stock Option Plan (the "Plan"), as follows:

         WHEREAS, the Company has determined that an increase in the number of
shares of Company common stock subject to the Plan is necessary; and

         WHEREAS, Section 3(a) of the Plan is hereby amended to increase the
number of shares of Company common stock subject to the Plan; and

         WHEREAS, by written unanimous consent of the Board of Directors of the
Company, said Board did specifically approve and adopt by resolution the
amendment hereinafter set forth.

         NOW, THEREFORE, in consideration of the premises hereinabove set forth,
the Company amends said Plan, as follows:

         1. Section 3(a) shall be amended and restated as follows:

         "(a) An aggregate of not more than 8,800,000 shares of Stock shall be
available for the grant of stock options under the Plan. If an option is
surrendered (except surrender for shares of Stock) or for any other reason
ceases to be exercisable in whole or in part, the shares which were subject to
such option but as to which the option had not been exercised shall continue to
be available under the Plan. Any Stock which is retained by the Company upon
exercise of an option in order to satisfy the exercise price for such option or
any withholding taxes due with respect to such option exercise shall be treated
as issued to the Optionee and will thereafter not be available under the Plan."

         The Company has caused this Amendment to be executed by its duly
authorized officer and its corporate seal to be affixed hereunto on the day and
year first above written.

                                    VERILINK CORPORATION

                                    /s/ Graham G. Pattison
                                    --------------------------------------------
                                    By:  Graham G. Pattison
                                    Its: President

ATTEST:

/s/ C. W. Smith
------------------------------------
By:  C. W. Smith
Its: Secretary

(CORPORATE SEAL)

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