Document:

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                                                                     Exhibit 4-j

                             UNDERWRITING AGREEMENT

                                                                December 7, 2000

BellSouth Telecommunications, Inc.
675 West Peachtree Street, N.E.
Atlanta, Georgia  30375

Ladies and Gentlemen:

         We (the "MANAGER") understand that BellSouth Telecommunications, Inc.
(the "COMPANY") proposes to issue and sell $1,800,000,000 aggregate principal
amount of its Extendible Liquidity Securities ("EXLs"). The EXLs will be issued
pursuant to a supplemental indenture dated December 14, 2000 to an indenture
dated June 1, 1998 with SunTrust Bank, Atlanta (such indenture, as supplemented,
the "INDENTURE").

         Subject to the terms and conditions set forth herein or incorporated by
reference herein, the Company hereby agrees to sell to the underwriters named
below (each such underwriter being herein called an "UNDERWRITER"), and each
Underwriter agrees to purchase, the principal amount of such EXLs set forth
below opposite its name at a purchase price of 99.750% of the principal
amount.

<TABLE>
<CAPTION>
Name                                                Principal Amount
----                                                ----------------

<S>                                                 <C>
Banc of America Securities LLC                          900,000,000
Morgan Stanley & Co. Incorporated                       900,000,000
                                                     --------------
                           Total                     $1,800,000,000
                                                     ==============
</TABLE>

         The Underwriters will pay for such EXLs by wire transfer in immediately
available funds upon delivery thereof through the book-entry facilities of The
Depository Trust Company at 10:00 a.m. (New York time) on December 14, 2000. In
addition, the Underwriters agree to pay to the Company, on such settlement date,
an amount equal to $900,000 as reimbursement for expenses incurred by the
Company.

<PAGE>   2

         The EXLs shall have the terms set forth in the attached draft
Prospectus Supplement dated December 7, 2000.

         All the provisions contained in the document entitled the BellSouth
Telecommunications, Inc. Underwriting Agreement Standard Provisions (Debt) dated
January 1, 1992, a copy of which you have previously received, are herein
incorporated by reference in their entirety and shall be deemed to be a part of
this Agreement to the same extent as if such provisions had been set forth in
full herein.
                                    Very truly yours,

                                    BANC OF AMERICA SECURITIES LLC

                                    By  /s/ David J. Walker
                                        -------------------------------
                                        Name: David J. Walker

                                    MORGAN STANLEY & CO.
                                      INCORPORATED

                                    By  /s/ Michael Fusco
                                        -------------------------------
                                        Name:
Accepted:

BELLSOUTH TELECOMMUNICATIONS, INC.

By  /s/ Jim Young
    -------------------------------
    Name:

                                       2<PAGE>   1
                                                                     Exhibit 4-k
                               Form of Tax Opinion

                                 (212) 450-4000

                                                             [Closing Date]

BellSouth Telecommunications, Inc
675 West Peachtree Street, N.E.
Atlanta, Georgia 30375
(404) 927-1909

                     Re: BellSouth Telecommunications, Inc.
                         Extendible Liquidity Securities

Dear Sirs:

         We have acted as special tax counsel for BellSouth Telecommunications,
Inc. (the "COMPANY") in connection with the offering of $1,800,000,000 of the
Company's Extendible Liquidity Securities (the "EXLS"). We hereby confirm the
opinion (the "OPINION") set forth under the caption "United States Federal
Income Taxation" in the prospectus supplement dated December 7, 2000 (the
"PROSPECTUS SUPPLEMENT") to the Company's prospectus dated May 12, 1999. As
stated in the Prospectus Supplement, it is our opinion that it is more likely
than not that an election to extend the maturity of all or any portion of the
principal amount of the EXLs in accordance with the procedures described in the
Prospectus Supplement will not be a taxable event for U.S. federal income tax
purposes.

         We hereby consent to the use of our name under the caption "United
States Federal Income Taxation" in the Prospectus Supplement. The issuance of
such a consent does not concede that we are an "Expert" for the purposes of the
Securities Act of 1933.

                                    Very truly yours,<PAGE>   1

                                                                   EXHIBIT 10.19

                      SECOND ADDENDUM TO RESELLER AGREEMENT
--------------------------------------------------------------------------------

This Second Addendum to the Reseller Agreement dated September 18, 1997
(hereinafter the "Agreement") and First Addendum to the Agreement executed on
September 17, 1998 (hereinafter the "First Addendum") is made and entered into
the 1st day of August, 2000 by and between T/R Systems, Inc., a corporation
organized and existing under the laws of the State of Georgia, USA (hereinafter
the "Company") and Kyocera Mita Corporation (formerly Mita Industrial Co., Ltd.)
a corporation organized and existing under the laws of the country of Japan (
hereinafter "Reseller").

WHEREAS, the Reseller desires:

(i)      for the Company to perform certain development projects for
         connectivity to printer and copier products marketed by the Reseller.

(ii)     the right to market the results of the development in the territory
         specified in Schedules for development projects attached to this
         Addendum.

WHEREAS, the Company desires to perform development projects for the Reseller as
requested and agreed in accordance with Schedules attached to this Second
Addendum. Such Schedules to be numbered 1-1,1-2 and so forth specifying the
development project and the associated territory authorized for marketing of the
Deliverables of the Projects by the Reseller.

NOW THEREFORE, in consideration of the mutual promises and covenants herein
contained and other valuable consideration, the receipt of which are hereby
acknowledged, the parties hereto agree as follows:

1.       The Company agrees to perform development projects as requested from
         time to time by the Reseller. Deliverables (equivalent to the "Addendum
         Deliverables" defined in the First Addendum), schedules and related
         development fees for each project will be specified on Project
         Schedules attached to this Second Addendum.

2.       The Company agrees to sell Deliverables, but does not transfer any
         intellectual property ownership in Deliverables, to Reseller for
         distribution in the territory as specified in each Project Schedule on
         an exclusive basis for the Enable Software for connectivity to output
         devices for development projects funded by Reseller. The MicroPress and
         its associated optional software are provided on a non-exclusive basis
         in the territory. The Company agrees to notify the Reseller when other
         third parties become authorized to distribute the non-exclusive
         products in the territory.

3.       Pricing for Deliverables will be as specified in the Price List.

4.       Reseller shall pay for Products and Deliverables, or cause such payment
         to be made on its behalf, within * (*) days after the bill of lading
         date.

5.       Payment for Development Fees shall be in accordance with the payment
         terms noted on the Project Schedule for the specific project attached
         to this Second Addendum.

6.       The Company shall provide Reseller (not Reseller Customers or End
         Users) with software updates and technical support by phone and e-mail
         for a maintenance charge. A maintenance charge rate of * percent (*%)
         is due and payable * as attested below in respect of Deliverables
         purchases (including equipment purchases and any other purchases). The
         maintenance charge is payable on the * day of * in respect of the *
         ending *, and such * payment shall equal * percent ( *%) of the amounts
         paid or payable in respect of Deliverables ordered during such *.

7.       Except to the extent otherwise provided for herein, or unless the
         context indicates otherwise, all provisions in the Agreement and the
         First Addendum relating to the purchase and sales of Products shall
         apply to the

*        Confidential information has been omitted and filed separately with the
         Commission.

<PAGE>   2

         purchase and sale of Deliverables under this Addendum, including
         without limitation, the obligations of the Reseller under Section 3 of
         the Agreement to the extent applicable; the provisions governing
         Orders, Price, and Payment and Delivery Terms in Section 4, 5 and 6;
         the Patent and Copyright Indemnity and Warranty in Sections 7 and 11,
         without application, however, to hardware, printer or other components
         or equipment not supplied by the Company, and subject to the Limitation
         of Remedies in Section 12; and provisions governing Protection of
         Proprietary Information in Section 15. The term of this Addendum shall
         be co-extensive with the term of the Agreement and is subject to the
         termination provisions of the Agreement.

8.       Other than specifically provided for herein, this Addendum shall not
         modify or amend or otherwise alter, or constitute any waiver of any
         rights or remedies under the Agreement.

IN WITNESS WHEREOF, the Company and Reseller hereby have duly executed this
Reseller Agreement in duplicate on the dates indicated hereon.

T/R SYSTEMS, INC.                              KYOCERA MITA CORPORATION

By:           /s/ Lyle W. Newkirk              By:    /s/ Koji Seki
     -------------------------------------        ------------------------------

Print Name:          Lyle W. Newkirk           Print Name:  Koji Seki
           -------------------------------                ----------------------

Title:  Sr. Vice Pres., CFO and Treasurer      Title:   President
      ------------------------------------           ---------------------------

Date:                                          Date:
     -------------------------------------          ----------------------------

<PAGE>   3

                                  SCHEDULE 1-1

                     DEVICE CONNECTIVITY DEVELOPMENT PROJECT

NAME OF DEVICE FOR CONNECTIVITY:          *
AUTHORIZED TERRITORY FOR DISTRIBUTION:    WORLDWIDE
DEVELOPMENT FEE:                          $*
MINIMUM PURCHASE QUANTITY:                *
ESTIMATED START DATE:                     *
ESTIMATED COMPLETION DATE:                *

KYOCERA MITA PROJECT DELIVERABLES:  JOINT

         -        Supply of Controller Command Sets and Interface Information

         -        Technical Resource Availability for Interface Clarification

         -        Joint Development of Acceptance Criteria with T/R Systems

         -        * Printers and Set-up to Support Project Plan (* to * units)

T/R PROJECT DELIVERABLES:

         -        Project Scope and Definition

         -        Project Plan

         -        * Connectivity Design and Development

         -        * Specific Software Design and Development

         -        Regulatory Testing (US Only)

         -        Quality Assurance Testing

         -        Installation Instructions

         -        Documentation Specific to * PrintLink and * Specific Software

NOTES:

         1.       Payment of $* for the Development Fee for the * shall be due
                  *.

         2.       Translation of this version's software screens and
                  documentation into Japanese is included in the Development
                  Fee. Translation of subsequent versions into Japanese will be
                  available for $*. Schedules and Requirements for the Japanese
                  version will be mutually agreed.

         3.       Translation of this version's software screens and
                  documentation into additional languages (French, German, and
                  Spanish) will be available for $* per language. Translation of
                  subsequent versions into these additional languages will be
                  available for $*. Schedules and Requirements for additional
                  language versions will be mutually agreed.

         4.       This project assumes connectivity of the MicroPress to the *
                  through the Kyocera Mita provided Controller. Changes in
                  approach and scope of work, may result in changes in the fees
                  associated with this project.

*        Confidential information has been omitted and filed separately with the
         Commission.

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