Document:

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                                                                   EXHIBIT 10.15

                            BRITE VOICE SYSTEMS, INC.

                              EMPLOYMENT AGREEMENT

     This Employment Agreement ("Agreement") is dated as of July 15, 1999,
between BRITE VOICE SYSTEMS, INC. a Kansas corporation (the "Company"), and RAY
S. NAEINI (the "Employee").

                                   WITNESSETH:

     WHEREAS, the Employee and the Company desire to enter into this Agreement
to provide for certain terms and conditions of Employee's employment by the
Company.

     NOW, THEREFORE, for and in consideration of the premises and the mutual
covenants contained herein, and for other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, and subject to the
terms and conditions hereinafter set forth, the parties hereto agree as follows:

1.   DEFINITIONS.

     In addition to the words and terms elsewhere defined in this Agreement, the
following words and terms as used herein shall have the following meanings,
unless the context or use indicates a different meaning:

     "Cause" means (a) any act by the Employee that is materially adverse to the
best interests of the Company and which, if the subject of a criminal
proceeding, could result in a criminal conviction for a felony or (b) the
negligent or willful failure by the Employee to substantially perform his duties
hereunder, which duties are within the control of the Employee (other than the
failure resulting from the Employee's incapacity due to physical or mental
illness), provided, however, that the Employee shall not be deemed to be
terminated for Cause under this subsection (b) unless and until (1) after the
Employee receives written notice from the Company specifying with reasonable
particularity the actions of the Employee which constitute a violation of this
subsection (b) and (2) within a period of 30 days after receipt of such notice
(and during which the violation is within the control of the Employee), the
Employee fails to reasonably and prospectively cure such violation.

     "Common Stock" means the Company's common stock, no par value per share.

     An "Event of Default" means the occurrence of any of the following events,
unless remedied or otherwise cured within 30 days after the Company's receipt of
written notice from the Employee of such event, (a) a breach by the Company of
any of its express or implied obligations under this Agreement, (b) without his
prior concurrence, the Employee is assigned any duties or responsibilities that
are inconsistent with his position, duties, responsibilities or status at the
commencement of the term of this Agreement in material respects, or (c) the

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Employee's base compensation is reduced or any other failure by the Company to
comply with Section 4.

2.   EMPLOYMENT.

     The Company hereby employs the Employee and the Employee hereby accepts
employment on the terms and conditions set forth herein.

3.   TERM

     The term of this Agreement, unless expressly extended by a written
agreement signed by both parties, shall be the one-year period commencing as of
the effective date of this Agreement unless sooner terminated in accordance with
the provisions herein regarding termination (the "Employment Term").

4.   COMPENSATION

     (a) Base Salary. For all services rendered by the Employee under this
Agreement, the Company shall pay the Employee a base salary of one hundred
ninety-five thousand dollars ($195,000) per year (as any time adjusted in
accordance with this Section 4(a), the "Base Salary"). Such salary shall be
payable in equal monthly installments in accordance with the customary payroll
policies of the Company in effect at the time such payment is made. On or about
the anniversary date of this Agreement each year during the term hereof, the
Compensation Committee of the Company shall review Employee's performance for
the prior year and may make such adjustments in base salary from time to time at
their discretion as the Employee and the Company may agree.

     (b) Annual Bonus. Effective for the remainder of the fiscal year for
InterVoice, Inc. ("InterVoice") ending February 28, 2000 and continuing with
respect to each subsequent fiscal year thereafter during the term of this
Agreement, the Company will pay the Employee incentive compensation in an amount
up to but not exceeding Employee's then current annual Base Salary and based on
the Employee's then current Incentive Plan as provided to the Employee by the
Company. Certain parameters for the Employee's Incentive Plan for InterVoice's
fiscal year ending February 28, 2000 are attached as Schedule A, and
incorporated into this Agreement by this reference. The final Incentive Plan for
fiscal 2000 will be consistent with the parameters set forth on Schedule A and
will be provided to Employee by the Company on or before August 31, 1999.

     (c) Benefits. The Employee shall be entitled to participate in or receive
benefits under any employee benefit plan or arrangement made available by the
Company, or by any successor to the Company under this Agreement, in the future
to its similarly situated officers and key management personnel, subject to and
on a basis consistent with the terms, conditions and overall administration of
such plan or arrangement. Nothing paid to the Employee under any plan or
arrangement presently in effect or made available in the future shall be deemed
to be in

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lieu of the salary and bonuses payable to the Employee pursuant to Subsections
4(a) and (b). In addition, the Company currently has a director and officer
insurance policy which provides insurance for the Company's directors and
officers in accordance with its terms.

     (d) Stock Option. In consideration of the Employee's execution of this
Agreement, and subject to shareholder approval of InterVoice's proposed 1999
Stock Option Plan at the annual meeting of shareholders of InterVoice on August
17, 1999, InterVoice will grant an option to purchase 100,000 shares of
InterVoice's Common Stock to the Employee pursuant to the Company's 1999 Stock
Option Plan. The exercise price for such option will be the closing price for
InterVoice's Common Stock on the Nasdaq National Market on the date of grant
(which will be August 17, 1999 if the Plan is approved by shareholders), and the
option will become exercisable in three equal amounts on the first three annual
anniversaries of the date of grant. The option will be a "nonqualified" option
that is not intended to be, nor treated as, an incentive stock option within the
meaning of Section 422 of the Internal Revenue Code of 1986, as amended. The
option will be subject to the terms and conditions of InterVoice's standard form
of Nonqualified Stock Option Agreement.

     (e) Signing Bonus and Anniversary Bonus. In accordance with the general
payroll practices of the Company (including authorized or legally required
payroll deductions), the Company shall pay to Employee: (i) within seven (7)
days after the commencement date of this Agreement, $50,000 (the "Signing
Bonus"); and (ii) within seven (7) days after the one-year anniversary of the
commencement date of this Agreement, provided Employee remains an employee of
the Company through such one-year anniversary date, $50,000 (the "Anniversary
Bonus"). If Employee voluntarily terminates employment with the Company during
the Employment Term for any reason (including, without limitation, to accept a
new job or to retire), or if Employee's employment with the Company is
terminated for Cause in accordance with this Agreement, then Employee shall not
receive the Anniversary Bonus and, within five (5) business days of the date of
any such termination of employment, repay the entire amount of the Signing
Bonus. If the Signing Bonus becomes repayable by Employee, the Employee hereby
authorizes the Company to offset from final payments (including, without
limitation, expense reimbursements, salary, wages, commissions, bonuses,
incentive pay, short-term disability pay, and vacation), to the full extent
permitted by applicable law, up to the full amount of any repayment due the
Company.

     (f) Expenses. Upon receipt of itemized vouchers, expense account reports,
and supporting documents submitted to the Company in accordance with the
Company's procedures from time to time in effect, the Company shall reimburse
the Employee for all reasonable and necessary travel, entertainment, and other
reasonable and necessary business expenses incurred ordinarily and necessarily
by the Employee in connection with the performance of his duties hereunder.

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     (g) Vacation. For vacation purposes only, the Employee shall be treated as
if he were a five-year employee (entitled to a minimum of three weeks' paid
vacation during each 12-month period) effective on the first day of the month
following completion of six months after the effective date of this Agreement.

5.   POSITION, DUTIES, EXTENT OF SERVICES AND SITUS.

     (a) Position and Duties. Employee shall serve as an Executive Vice
President of the Company's parent company, InterVoice, and shall have
supervision and control over, and responsibility for, key functions (as
specified by the Company and/or InterVoice) for InterVoice's and the Company's
global network business, and the Employee shall have such other powers and
duties as may from time to time be prescribed, provided that such duties are
reasonable and customary for an Executive Vice President. The Employee will move
to Dallas, Texas at a mutually agreed upon time pursuant to the terms and
conditions of InterVoice's Domestic Moving Allowance Policy and
Procedures-Exempt Employees.

     (b) Extent of Services. The Employee shall devote substantially all of his
business time, attention, and energy to the business and affairs of the Company
and InterVoice and shall not during the term of his employment under this
Agreement engage in any other business activity which could constitute a
conflict of interest, whether or not such business activity is pursued for gain,
profit, or other pecuniary advantage. This provision shall not be construed as
preventing the Employee from managing his current investments or investing his
assets in such form or manner as will not require any services on the part of
the Employee in the operation and the affairs of the companies in which such
investments are made, subject to the provisions of Sections 6 and 27.

6.   COVENANT NOT TO COMPETE.

     (a) The Employee acknowledges that (i) as a result of his position with the
Company he will receive specialized and unique training and knowledge concerning
the Company, its business, its customers and the industry in which it competes,
(ii) the Company's business, in large part, depends upon its exclusive
possession and use of the Proprietary Information (as defined in Section 27),
(iii) the Company is entitled to protection against the unauthorized disclosure
or use by the Employee of the Proprietary Information or the training and
knowledge received by the Employee and (iv) he has received in this Agreement
good and valuable consideration for the covenants he is making in this Section 6
and in Section 27, including but not limited to the Company's agreement to
provide Employee with the matters described in subsection (a)(i) of this
Section. The Company and the Employee acknowledge and agree that the covenants
contained in this Section 6 and in Section 27 are reasonably necessary for the
protection of the Company and are reasonably limited with respect to the
activities they prohibit, their duration, their geographical scope and their
effects on the Employee and the public. The parties acknowledge that the purpose
and effect of the covenants are to protect the Company from unfair competition
by the Employee.

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     (b) Except as provided in the last sentence of this Section 6(b), during
the period in which the Employee renders services to the Company under this
Agreement and for twelve (12) months thereafter, the Employee shall not, without
the written consent of the Company, own, manage, operate, control, serve as an
officer, director, employee, partner or consultant of or be connected in any way
with or have any interest in any corporation, partnership, proprietorship or
other entity which carries on business activities in the call automation and/or
voice automation industry or industries in any state of the United States or in
any foreign country in which the Company has sold or installed its products or
systems or has definitive plans to sell or install its products at any time
prior to or at the time of the date of termination of the Employee's employment;
except that the Employee may own up to 1% of the shares of any publicly-owned
corporation, provided that none of his other relationships with such corporation
violates such covenant. Notwithstanding the foregoing, the provisions of this
Section 6 shall not apply if the Employee's employment with the Company under
this Agreement is terminated (i) by the Company, unless the Employee is
terminated in accordance with Section 7 or for Cause in accordance with
Subsection 9(a), or (ii) at the election of the Employee after the occurrence of
an Event of Default which has not been waived in writing.

     (c) The Company and the Employee hereby agree that in the event that the
noncompetition covenants contained herein should be held by any court or other
constituted legal authority of competent jurisdiction to be effective in any
particular area or jurisdiction only if said covenants are modified to limit
their duration, geographical area or scope, then the parties hereto will
consider Section 6 to be amended and modified with respect to that particular
area or jurisdiction so as to comply with the order of any such court or other
constituted legal authority and, as to all other jurisdictions or political
subdivisions thereof, the noncompetition covenants contained herein will remain
in full force and effect as originally written. The Company and the Employee
further agree that in the event that the noncompetition covenants contained
herein should be held by any court or other constituted legal authority of
competent jurisdiction to be void or otherwise unenforceable in any particular
area or jurisdiction notwithstanding the operation of this Section 6(c), then
the parties hereto will consider this Section 6 to be amended and modified so as
to eliminate therefrom that particular area or jurisdiction as to which such
noncompetition covenants are so held void or otherwise unenforceable, and, as to
all other areas and jurisdictions covered by the noncompetition covenants, the
terms and provisions hereof shall remain in full force and effect as originally
written.

     (d) The Employee recognizes and acknowledges that the Company would suffer
irreparable harm and substantial loss if the Employee violated any of the terms
and provisions of this Section 6 or Section 27 and that the actual damages which
might be sustained by the Company as the result of any breach of this Section 6
or Section 27 would be difficult to ascertain. The Employee agrees, at the
election of the Company and in addition to, and not in lieu of, the Company's
right to terminate the Employee's employment and to seek all other remedies and
damages which the Company may have at law and/or equity for such breach, that
the Company shall be entitled to an injunction restraining the Employee from
breaching any of the terms or provisions of this Section 6 or Section 27.

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7.   COMPENSATION IN THE EVENT OF DISABILITY.

     (a) Disability. If the Employee becomes disabled during the term of this
Agreement the Company shall cause to be paid to the Employee an amount equal to
his base salary in effect at the time of disability under Subsection 4(a), for
the shorter of the duration of the disability or the remainder of the term of
this Agreement and, subject to the provisions of Section 22, with no liability
on its part for further payments to the Employee during the duration of the
disability. Subject to Subsection 7(b) below, full compensation shall be
reinstituted upon his return to employment and resumption of his duties. For
purposes of this Subsection 7(a) the Employee shall be deemed "disabled" when he
is unable, notwithstanding any reasonable accommodation required by law, for a
period of 90 consecutive days, to perform the essential functions of his
employment position due to bodily injury or disease or any other physical or
mental incapacity.

     (b) Complete Disability. The Company shall have the right to terminate the
Employee's employment under this Agreement prior to the expiration of the term
upon the "Complete Disability" of the Employee as hereinafter defined (provided,
however, that the obligations of the Company under Subsection 7(a) shall not
terminate). The term "Complete Disability" as used in this Subsection 7(b) shall
mean (i) the total inability of the Employee, despite any reasonable
accommodation required by law, due to bodily injury or disease or any other
physical or mental incapacity, to perform the services provided for hereunder
for a period of 120 days, in the aggregate, within any given period of 180
consecutive days during the term of this Agreement, in addition to any
statutorily required leave of absence, and (ii) where such inability will, in
the opinion of a qualified physician (reasonably acceptable to Employee), be
permanent and continuous during the remainder of the term of this Agreement.

8.   COMPENSATION IN THE EVENT OF DEATH.

     If the Employee dies during the term of his employment, the Company shall
pay to such person as the Employee shall designate in a notice filed with the
Company, or, if no such person shall be designated, to his estate as a death
benefit, his base salary in effect at the time of his death pursuant to
Subsection 4(a), in equal semi-monthly installments on the first and fifteenth
day of each month immediately succeeding his death, for a period of months (not
exceeding 12) determined by multiplying the number of complete 12-month periods
of employment of the Employee by the Company (whether pursuant to an employment
agreement or not) by two, in addition to any payments the Employee's spouse,
beneficiaries, or estate may be entitled to receive pursuant to any pension or
employee benefit plan or life insurance policy maintained by the Company, and,
except for any obligations of the Company under Section 22, all other
obligations of the Company hereunder shall cease at the time of the Employee's
death.

9.   TERMINATION.

     (a) Upon at least 30 days' prior written notice to the Employee, the
Company may terminate the Employee's employment with the Company under this
Agreement only for Cause or in accordance with Section 7 and, subject to the
provisions of Sections 7 and 22, with no

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liability on its part for further payments to the Employee. The Company may
effect a termination for Cause pursuant to this Subsection 9(a) only by the
affirmative vote of a majority of the members of the Board of Directors of the
Company. In voting upon such termination for Cause, if the Employee is also a
member of the Board of Directors of the Company (it is not currently
contemplated that Employee will be elected to the Board of Directors), then he
may not vote on, and will not be considered present for any purpose with respect
to, a matter presented to the Board of Directors of the Company pursuant to this
Subsection 9(a).

     (b) The Employee may terminate his employment with the Company under this
Agreement by giving at least 90 days' prior written notice of his desire to
terminate employment to the Board of Directors of the Company. If the Employee's
employment with the Company under this Agreement is terminated pursuant to this
Subsection 9(b), the Employee will continue to accrue and receive his base
salary in effect at the time pursuant to Subsection 4(a) through the date of
termination with no liability on the part of the Company for further payments to
the Employee, subject to the provisions of Section 22.

     (c) If the Employee's employment with the Company is terminated by the
Company without Cause or if the Employee terminates his employment with the
Company following the occurrence of an Event of Default which has not been
waived in writing by the Employee, the Employee will continue to accrue and
receive his base salary in effect at the time pursuant to Subsection 4(a)
through the date of termination and will be entitled to receive the benefits
provided for under Section 10 (unless the Employee's employment is terminated in
accordance with Section 7) with no liability on the part of the Company for
further payments to the Employee, subject to the provisions of Sections 4(e), 7
and 22.

10.  COMPENSATION AFTER CERTAIN TERMINATIONS.

     If the Employee's employment with the Company is terminated (whether such
termination is by the Employee or by the Company) at any time during the term of
this Agreement for any reason other than (a) termination by the Company for
Cause in accordance with Subsection 9(a); (b) termination by the Company in
accordance with Section 7; (c) the Employee's death; or (d) termination at the
election of the Employee pursuant to Subsection 9(b); then, within five days
after the date of such termination, (i) the Remaining Base Compensation (as
herein defined) which would have been paid to the Employee during the remainder
of the term of this Agreement if termination had not occurred shall become due
and payable and shall be paid to the Employee in a single lump sum in cash, and
(ii) all stock options granted to Employee pursuant to Subsection 4(d) hereof
which are not then exercisable shall, notwithstanding the provisions of any
other agreement, become immediately exercisable and shall remain exercisable
until they are exercised or until they otherwise would expire in accordance with
the terms of the Stock Option Plan and agreement applicable to the exercise of
stock options following termination of employment. For purposes of this Section
10, the "Remaining Base Compensation" shall mean an amount equal to the annual
Base Salary payable to the Employee pursuant to Subsection 4(a) at the time of
termination and the Anniversary Bonus.

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11.  MITIGATION.

     The Employee shall not be required to mitigate the amount of any payment
provided for in this Agreement by seeking other employment or otherwise, nor
shall the amount of any payment provided for in this Agreement be reduced by any
compensation earned by the Employee as the result of employment by another
employer after the date of the termination of the Employee's employment with the
Company, or otherwise.

12.  ENTIRE AGREEMENT.

     This Agreement embodies the entire agreement and understanding between the
parties hereto with respect to the subject matter hereof and supersedes all
prior negotiations, agreements, and understandings relating to such subject
matter, and may be modified or amended only by an instrument in writing signed
by the parties hereto.

13.  LAW TO GOVERN.

     This Agreement is executed and delivered in the State of Texas and shall be
governed, construed and enforced in accordance with the laws of the State of
Texas, except that the arbitration provision of Section 28 is governed by the
Federal Arbitration Act.

14.  ASSIGNMENT.

     This Agreement is personal to the parties, and, except as expressly set
forth in this Section 14, neither this Agreement nor any interest herein may be
assigned (other than by will or by the laws of descent and distribution) without
the prior written consent of the parties hereto nor be subject to alienation,
anticipation, sale, pledge, encumbrance, execution, levy, or other legal process
of any kind against the Employee or any of his beneficiaries or any other
person. Notwithstanding the foregoing, the Company shall be permitted to assign
this Agreement without Employee's consent, to InterVoice, or to any corporation
or other business entity succeeding to substantially all of the business and
assets of the Company and/or InterVoice by merger, consolidation, sale of
assets, or otherwise, if the Company and/or InterVoice obtains the assumption of
this Agreement by such successor. Failure by the Company and/or InterVoice to
obtain such assumption prior to the effectiveness of such succession by any such
corporation or other business entity, with the exception of InterVoice, shall be
a breach of this Agreement and shall entitle the Employee to receive
compensation from the Company under this Agreement in the same amount and on the
same terms as he would be entitled to hereunder if his employment had been
terminated without Cause, and, for purposes of implementing the foregoing, the
date on which any such succession becomes effective shall be deemed the date of
termination.

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15.  BINDING AGREEMENT.

     Subject to the provisions of Section 14 of this Agreement, this Agreement
shall be binding upon and shall inure to the benefit of the Company and the
Employee and their respective representatives, successors, and assigns.

16.  REFERENCES AND GENDER.

     All references to "Sections" and "Subsections" contained herein are, unless
specifically indicated otherwise, references to sections and subsections of this
Agreement. Whenever herein the singular number is used, the same shall include
the plural where appropriate, and words of either gender shall include the other
gender where appropriate.

17.  WAIVER.

     No waiver of any right under this Agreement shall be deemed effective
unless the same is set forth in writing and signed by the party giving such
waiver, and no waiver of any right shall be deemed to be a waiver of any such
right in the future.

18.  NOTICES.

     Except as may be otherwise specifically provided in this Agreement, all
notices required or permitted hereunder shall be in writing and will be deemed
to be delivered when deposited in the United States mail, postage prepaid,
registered or certified mail, return receipt requested, addressed to the party
or parties at 17811 Waterview Parkway, Dallas, Texas 75252, or at such other
addresses as may have theretofore been specified by written notice delivered in
accordance herewith.

19.  OTHER INSTRUMENTS.

     The parties hereto covenant and agree that they will execute such other and
further instruments and documents as are or may become necessary or convenient
to effectuate and carry out the terms of this Agreement.

20.  HEADINGS.

     The headings used in this Agreement are used for reference purposes only
and do not constitute substantive matter to be considered in construing the
terms of this Agreement.

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21.  INVALID PROVISION.

     Any clause, sentence, provision, section, subsection, or paragraph of this
Agreement held by a court of competent jurisdiction to be invalid, illegal, or
ineffective shall not impair, invalidate, or nullify the remainder of this
Agreement, but the effect thereof shall be confined to the clause, sentence,
provision, section, subsection, or paragraph so held to be invalid, illegal or
ineffective.

22.  RIGHTS UNDER PLANS AND PROGRAMS.

     Anything in this Agreement to the contrary notwithstanding, no provision of
this Agreement is intended, nor shall it be construed, to reduce or in any way
restrict any benefit to which the Employee may be entitled under any other
agreement, plan, arrangement, or program providing benefits for the Employee
which is not referenced in this Agreement or in a Schedule to this Agreement.

23.  MULTIPLE COPIES.

     This Agreement may be executed simultaneously in one or more counterparts,
each of which shall be deemed an original and all of which shall together
constitute one and the same instrument. The terms of this Agreement shall become
binding upon each party from and after the time that he or it executed a copy
hereof. In like manner, from and after the time that any party executes a
consent or other document, such consent or other document shall be binding upon
such parties.

24.  WITHHOLDING OF TAXES.

     The Company may deduct and withhold from any amounts payable under this
Agreement all federal, state, city, or other taxes as shall be required pursuant
to any law or government regulation or ruling.

25.  ENFORCEABILITY.

     Each party to this Agreement acknowledges and represents that such party
has all requisite rights, power and authority to enter into this Agreement, and
that this Agreement, the terms and conditions of this Agreement, and the
transactions and obligations contemplated by this Agreement, will not result in
a breach of any agreement the party has with any third party.

26.  SET OFF OR COUNTERCLAIM.

     Except with respect to any claim against or debt or other obligation of the
Employee to the Company properly recorded on the books and records of the
Company or referred to in this Agreement, there shall be no right of set off or
counterclaim against, or delay in, any payment by the Company to the Employee or
his beneficiaries provided for in this Agreement in respect of

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any claim against or debt or other obligation of the Employee, whether arising
hereunder or otherwise.

27.  ASSIGNMENT, PROTECTION AND CONFIDENTIALITY OF PROPRIETARY INFORMATION.

     The Employee acknowledges and agrees that all items of the Company's
Proprietary Information constitute valuable, special and unique assets and trade
secrets of its business, which provide to the Company a competitive advantage
over others who do not have access thereto and access to which is essential to
the performance of the Employee's duties hereunder. The Employee shall not,
during the term of this Agreement or thereafter, use or disclose any Proprietary
Information that is not otherwise publicly available, in whole or in part, for
his benefit or for the benefit of any other person or party, except for the
Company. As used herein, "Proprietary Information" includes, but is not limited
to, customer lists and prices, whether current or prospective, product designs
or other product information, experimental developments and other research and
development information, testing processes, marketing studies and research
activities, and any other trade secrets concerning the Company, its
shareholders, officers, directors, employees, business prospects, customers,
transactions, finances, affairs, opportunities, operations, properties or
assets. The Employee further agrees that all inventions, devices, compounds,
processes, formulas, techniques, improvements and modifications which he may
develop, in whole or in part, during the term of his employment or through or
with the facilities, equipment or resources of the Company shall be and remain
the sole and exclusive property of the Company. The Employee agrees to deliver
to the Company at any time the Company may request, all memoranda, notes, plans,
records, reports, and other documents (including copies thereof and all
embodiments thereof whether in computerized form or any other medium) relating
to the business or affairs of the Company or its subsidiaries which he may then
possess or have under his control. The Employee shall maintain in good condition
all tangible and other forms of Proprietary Information in the Employee's
custody or control until his obligations under the preceding sentence are
satisfied. The Employee agrees to execute all documents and take such other
actions as may be required to comply with this Section.

28.  ARBITRATION.

     Any dispute arising in connection with this Agreement or in any way arising
out of or related to the employment relationship between the Employee and the
Company, or the termination of that relationship, including any claim of
unlawful discrimination, shall be finally resolved by arbitration in Dallas,
Texas, governed by the Federal Arbitration Act and conducted pursuant to and in
accordance with the National Rules for the Resolution of Employment Disputes of
the American Arbitration Association. Either the Company or the Employee may
request arbitration by sending written notice to the other party. In any such
arbitration, the only issues to be considered and determined by the
arbitrator(s) shall be issues pertaining to legal and equitable rights and
obligations of the parties under this Agreement and any applicable law. A
decision and award of the arbitrator(s) shall be final, and may be entered in
any court having jurisdiction thereof, and application may be made to such court
for judicial acceptance and/or an

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order enforcing such decision and/or award. Judicial review of any decision or
award shall be in accordance with the Federal Arbitration Act, except that
review of any award of punitive or exemplary damages shall be conducted as if
the award of such damages were made by a jury sitting in a federal district
court in Dallas, Texas. In the event the arbitrator(s) determine there is a
prevailing party in the arbitration, the prevailing party shall recover from the
losing party all costs of arbitration, including but not limited to the fees of
the arbitrator(s) and reasonable attorneys' fees incurred by the prevailing
party. The provisions of this Section 28 shall not be construed to limit or to
preclude either party from bringing an action in any court of competent
jurisdiction for injunctive relief.

     IN WITNESS WHEREOF, the parties have executed this Agreement as of July 15,
1999.

                                          BRITE VOICE SYSTEMS, INC.

                                          By: [ILLEGIBLE]
                                             -----------------------------------
                                          Name:
                                               ---------------------------------
                                          Title:
                                                --------------------------------

                                          EMPLOYEE

                                          /s/ RAY S. NAEINI
                                          --------------------------------------
                                          Name: Ray S. Naeini
                                               ---------------------------------

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                                   SCHEDULE A

The details of the annual bonus will need to be structured in detail based on
plan levels to be established as part of completing the merger and integration
plans. However, the following are the key components and levels that will be
followed:

PLAN COMPONENTS

o    InterVoice Revenue / Earnings

o    Operating Unit Revenue / Earning (Expense)

o    Individual Objectives

* PAY-OUT

o    Plan Performance Results in Bonus = 50% of Base Salary

o    Thresholds - 80% of Plan Performance = $0 Pay-out

o    Maximum Pay-out = 100% of Base Salary under the Overdrive Plan

o    Overdrive Plan

     o    Pay-out = 2X at 120% of Plan Performance

     o    X = 50% of Base Salary

*    Employee will be employed under this Agreement for only eight months of
     InterVoice's fiscal year ending February 28, 2000; accordingly, Employee's
     bonus under this Agreement for such fiscal year will be pro-rated based on
     the eight-month period between the effective date of this Agreement and the
     end of the fiscal year (i.e., for fiscal 2000, the Maximum Pay-out under
     this Agreement cannot exceed two-thirds of Employees' annual Base Salary).
     Any quarterly bonus payable to Employee by Company for any Company calendar
     quarter completed prior to the effective date of this Agreement will be
     paid to Employee in accordance with Employee's quarterly bonus plan in
     effect prior to the effective date of this Agreement.

                                       13<PAGE>   1
                                                                   EXHIBIT 10.16

                                INTERVOICE, INC.

                              EMPLOYMENT AGREEMENT

This Employment Agreement ("Agreement") is signed on September _____, 1999, and
effective as of, July 15, 1999, between BRITE VOICE SYSTEMS, INC. a Kansas
corporation (the "Company"), and DONALD R. WALSH (the "Employee").

                                   WITNESSETH:

WHEREAS, the Employee and the Company desire to enter into this Agreement to
provide for certain terms and conditions of Employee's employment by the
Company.

NOW, THEREFORE, for and in consideration of the premises and the mutual
covenants contained herein, and for other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, and subject to the
terms and conditions hereinafter set forth, the parties hereto agree as follows:

1.   DEFINITIONS.

In addition to the words and terms elsewhere defined in this Agreement, the
following words and terms as used herein shall have the following meanings,
unless the context or use indicates a different meaning:

     "Cause" means (a) any act by the Employee that is materially adverse to the
best interests of the Company and which, if the subject of a criminal
proceeding, could result in a criminal conviction for a felony or (b) the
negligent or willful failure by the Employee to substantially perform his
duties hereunder, which duties are within the control of the Employee (other
than the failure resulting from the Employee's incapacity due to physical or
mental illness), provided, however, that the Employee shall not be deemed to be
terminated for Cause under this subsection (b) unless and until (1) after the
Employee receives written notice from the Company specifying with reasonable
particularity the actions of the Employee which constitute a violation of this
subsection (b) and (2) within a period of 30 days after receipt of such notice
(and during which the violation is within the control of the Employee), the
Employee fails to reasonably and prospectively cure such violation.

     "Common Stock" means the Company's common stock, no par value per share.

     An "Event of Default" means the occurrence of any of the following events,
unless remedied or otherwise cured within 30 days after the Company's receipt of
written notice from the Employee of such event, (a) a breach by the Company of
any of its express or implied obligations under this Agreement, (b) without his
prior concurrence, the Employee is assigned any duties or responsibilities that
are inconsistent with his position, duties, responsibilities or status at the
commencement of the term of this Agreement in material respects, or (c) the

                                        1

<PAGE>   2

Employee's base compensation is reduced or any other failure by the Company to
comply with Section 4.

2.   EMPLOYMENT.

     The Company hereby employs the Employee and the Employee hereby accepts
employment on the terms and conditions set forth herein.

3.   TERM.

          The term of this Agreement, unless expressly extended by a written
agreement signed by both parties, shall be the one-year period commencing as of
the effective date of this Agreement unless sooner terminated in accordance with
the provisions herein regarding termination (the "Employment Term").

4.   COMPENSATION.

     (a) Base Salary. For all services rendered by the Employee under this
Agreement, the Company shall pay the Employee a base salary of one hundred
ninety thousand dollars ($190,000) per year (as any time adjusted in accordance
with this Section 4(a), the "Base Salary"). Such salary shall be payable in
equal monthly installments in accordance with the customary payroll policies of
the Company in effect at the time such payment is made. On or about the
anniversary date of this Agreement each year during the term hereof, the
Compensation Committee of the Company shall review Employee's performance for
the prior year and may make such adjustments in base salary from time to time at
their discretion as the Employee and the Company may agree.

     (b) Annual Bonus. Effective for the remainder of the fiscal year for
InterVoice, Inc. ("InterVoice") ending February 28, 2000 and continuing with
respect to each subsequent fiscal year thereafter during the term of this
Agreement, the Company will pay the Employee incentive compensation in an amount
up to but not exceeding Employee's then current annual Base Salary and based on
the Employee's then current Incentive Plan as provided to the Employee by the
Company. Certain parameters for the Employee's Incentive Plan for InterVoice's
fiscal year ending February 28, 2000 are attached as Schedule A, and
incorporated into this Agreement by this reference. The final Incentive Plan for
fiscal 2000 will be consistent with the parameters set forth on Schedule A and
will be provided to Employee by the Company.

     (c) Benefits. The Employee shall be entitled to participate in or receive
benefits under any employee benefit plan or arrangement made available by the
Company, or by any successor to the Company under this Agreement, in the future
to its similarly situated officers and key management personnel, subject to and
on a basis consistent with the terms, conditions and overall administration of
such plan or arrangement. Nothing paid to the Employee under any plan or
arrangement presently in effect or made available in the future shall be deemed
to

                                        2

<PAGE>   3

be in lieu of the salary and bonuses payable to the Employee pursuant to
Subsections 4(a) and (b). In addition, the Company currently has a director and
officer insurance policy which provides insurance for the Company's directors
and officers in accordance with its terms.

     (d) Stock Option. In consideration of the Employee's execution of this
Agreement, and subject to shareholder approval of InterVoice's proposed 1999
Stock Option Plan at the annual meeting of shareholders of InterVoice on August
17, 1999, InterVoice will grant an option to purchase 100,000 shares of
InterVoice's Common Stock to the Employee pursuant to the Company's 1999 Stock
Option Plan. The exercise price for such option will be the closing price for
InterVoice's Common Stock on the Nasdaq National Market on the date of grant
(which will be August 17, 1999 if the Plan is approved by shareholders), and the
option will become exercisable in three equal amounts on the first three annual
anniversaries of the date of grant. The option will be a "nonqualified" option
that is not intended to be, nor treated as, an incentive stock option within the
meaning of Section 422 of the Internal Revenue Code of 1986, as amended. The
option will be subject to the terms and conditions of InterVoice's standard form
of Nonqualified Stock Option Agreement.

     (e) Sinning Bonus and Anniversary Bonus. In accordance with the general
payroll practices of the Company (including authorized or legally required
payroll deductions), the Company shall pay to Employee: (i) within seven (7)
days after the commencement date of this Agreement, $50,000 (the "Signing
Bonus"); and (ii) within seven (7) days after the one-year anniversary of the
commencement date of this Agreement, provided Employee remains an employee of
the Company through such one-year anniversary date, $50,000 (the "Anniversary
Bonus"). If Employee voluntarily terminates employment with the Company during
the Employment Term for any reason (including, without limitation, to accept a
new job or to retire), or if Employee's employment with the Company is
terminated for Cause in accordance with this Agreement, then Employee shall not
receive the Anniversary Bonus and, within five (5) business days of the date of
any such termination of employment, repay the entire amount of the Signing
Bonus. If the Signing Bonus becomes repayable by Employee, the Employee hereby
authorizes the Company to offset from final payments (including, without
limitation, expense reimbursements, salary, wages, commissions, bonuses,
incentive pay, short-term disability pay, and vacation), to the full extent
permitted by applicable law, up to the full amount of any repayment due the
Company.

     (f) Expenses. Upon receipt of itemized vouchers, expense account reports,
and supporting documents submitted to the Company in accordance with the
Company's procedures from time to time in effect, the Company shall reimburse
the Employee for all reasonable and necessary travel, entertainment, and other
reasonable and necessary business expenses incurred ordinarily and necessarily
by the Employee in connection with the performance of his duties hereunder.

     (g) Vacation. For vacation purposes, the Employee shall be subject to
InterVoice's standard vacation policy based on his aggregate years of employment
with both the Company and InterVoice.

                                        3

<PAGE>   4

5.   POSITION, DUTIES, EXTENT OF SERVICES AND SITUS.

     (a) Position and Duties. Employee shall serve as an Executive Vice
President of the Company's parent company, InterVoice, and shall have
supervision and control over, and responsibility for, key functions (as
specified by the Company and/or InterVoice) for InterVoice's and the Company's
sales of network and business systems to Europe, the MidEast, Africa and the
Pacific Rim, and the Employee shall have such other powers and duties as may
from time to time be prescribed, provided that such duties are reasonable and
customary for an Executive Vice President.

     (b) Extent of Services. The Employee shall devote substantially all of his
business time, attention, and energy to the business and affairs of the Company
and InterVoice and shall not during the term of his employment under this
Agreement engage in any other business activity which could constitute a
conflict of interest, whether or not such business activity is pursued for gain,
profit, or other pecuniary advantage. This provision shall not be construed as
preventing the Employee from managing his current investments or investing his
assets in such form or manner as will not require any services on the part of
the Employee in the operation and the affairs of the companies in which such
investments are made, subject to the provisions of Sections 6 and 27.

6.   COVENANT NOT TO COMPETE.

     (a) The Employee acknowledges that (i) as a result of his position with the
Company he will receive specialized and unique training and knowledge concerning
the Company, its business, its customers and the industry in which it competes,
(ii) the Company's business, in large part, depends upon its exclusive
possession and use of the Proprietary Information (as defined in Section 27),
(iii) the Company is entitled to protection against the unauthorized disclosure
or use by the Employee of the Proprietary Information or the training and
knowledge received by the Employee and (iv) he has received in this Agreement
good and valuable consideration for the covenants he is making in this Section 6
and in Section 27, including but not limited to the Company's agreement to
provide Employee with the matters described in subsection (a)(i) of this
Section. The Company and the Employee acknowledge and agree that the covenants
contained in this Section 6 and in Section 27 are reasonably necessary for the
protection of the Company and are reasonably limited with respect to the
activities they prohibit, their duration, their geographical scope and their
effects on the Employee and the public. The parties acknowledge that the purpose
and effect of the covenants are to protect the Company from unfair competition
by the Employee.

     (b) Except as provided in the last sentence of this Section 6(b), during
the period in which the Employee renders services to the Company under this
Agreement and for twelve (12) months thereafter, the Employee shall not, without
the written consent of the Company, own, manage, operate, control, serve as an
officer, director, employee, partner or consultant of or be connected in any way
with or have any interest in any corporation, partnership,

                                        4

<PAGE>   5

proprietorship or other entity which carries on business activities in the call
automation and/or voice automation industry or industries in any state of the
United States or in any foreign country in which the Company has sold or
installed its products or systems or has definitive plans to sell or install its
products at any time prior to or at the time of the date of termination of the
Employee's employment; except that the Employee may own up to 1% of the shares
of any publicly-owned corporation, provided that none of his other relationships
with such corporation violates such covenant. Notwithstanding the foregoing, the
provisions of this Section 6 shall not apply if the Employee's employment with
the Company under this Agreement is terminated (i) by the Company, unless the
Employee is terminated in accordance with Section 7 or for Cause in accordance
with Subsection 9(a), or (ii) at the election of the Employee after the
occurrence of an Event of Default which has not been waived in writing.

     (c) The Company and the Employee hereby agree that in the event that the
noncompetition covenants contained herein should be held by any court or other
constituted legal authority of competent jurisdiction to be effective in any
particular area or jurisdiction only if said covenants are modified to limit
their duration, geographical area or scope, then the parties hereto will
consider Section 6 to be amended and modified with respect to that particular
area or jurisdiction so as to comply with the order of any such court or other
constituted legal authority and, as to all other jurisdictions or political
subdivisions thereof, the noncompetition covenants contained herein will remain
in full force and effect as originally written. The Company and the Employee
further agree that in the event that the noncompetition covenants contained
herein should be held by any court or other constituted legal authority of
competent jurisdiction to be void or otherwise unenforceable in any particular
area or jurisdiction notwithstanding the operation of this Section 6(c), then
the parties hereto will consider this Section 6 to be amended and modified so as
to eliminate therefrom that particular area or jurisdiction as to which such
noncompetition covenants are so held void or otherwise unenforceable, and, as to
all other areas and jurisdictions covered by the noncompetition covenants, the
terms and provisions hereof shall remain in full force and effect as originally
written.

     (d) The Employee recognizes and acknowledges that the Company would suffer
irreparable harm and substantial loss if the Employee violated any of the terms
and provisions of this Section 6 or Section 27 and that the actual damages which
might be sustained by the Company as the result of any breach of this Section 6
or Section 27 would be difficult to ascertain. The Employee agrees, at the
election of the Company and in addition to, and not in lieu of, the Company's
right to terminate the Employee's employment and to seek all other remedies and
damages which the Company may have at law and/or equity for such breach, that
the Company shall be entitled to an injunction restraining the Employee from
breaching any of the terms or provisions of this Section 6 or Section 27.

                                        5

<PAGE>   6

7.   COMPENSATION IN THE EVENT OF DISABILITY.

     (a) Disability. If the Employee becomes disabled during the term of this
Agreement the Company shall cause to be paid to the Employee an amount equal to
his base salary in effect at the time of disability under Subsection 4(a), for
the shorter of the duration of the disability or the remainder of the term of
this Agreement and, subject to the provisions of Section 22, with no liability
on its part for further payments to the Employee during the duration of the
disability. Subject to Subsection 7(b) below, full compensation shall be
reinstituted upon his return to employment and resumption of his duties. For
purposes of this Subsection 7(a) the Employee shall be deemed "disabled" when he
is unable, notwithstanding any reasonable accommodation required by law, for a
period of 90 consecutive days, to perform the essential functions of his
employment position due to bodily injury or disease or any other physical or
mental incapacity.

     (b) Complete Disability. The Company shall have the right to terminate the
Employee's employment under this Agreement prior to the expiration of the term
upon the "Complete Disability" of the Employee as hereinafter defined (provided,
however, that the obligations of the Company under Subsection 7(a) shall not
terminate). The term "Complete Disability" as used in this Subsection 7(b) shall
mean (i) the total inability of the Employee, despite any reasonable
accommodation required by law, due to bodily injury or disease or any other
physical or mental incapacity, to perform the services provided for hereunder
for a period of 120 days, in the aggregate, within any given period of 180
consecutive days during the term of this Agreement, in addition to any
statutorily required leave of absence, and (ii) where such inability will, in
the opinion of a qualified physician (reasonably acceptable to Employee), be
permanent and continuous during the remainder of the term of this Agreement.

8.   COMPENSATION IN THE EVENT OF DEATH.

     If the Employee dies during the term of his employment, the Company shall
pay to such person as the Employee shall designate in a notice filed with the
Company, or, if no such person shall be designated, to his estate as a death
benefit, his base salary in effect at the time of his death pursuant to
Subsection 4(a), in equal semi-monthly installments on the first and fifteenth
day of each month immediately succeeding his death, for a period of months (not
exceeding 12) determined by multiplying the number of complete 12-month periods
of employment of the Employee by the Company (comprised of the entire period of
time Employee has been employed by the Company in addition to the term of this
Agreement) by two, in addition to any payments the Employee's spouse,
beneficiaries, or estate may be entitled to receive pursuant to any pension or
employee benefit plan or life insurance policy maintained by the Company, and,
except for any obligations of the Company under Section 22, all other
obligations of the Company hereunder shall cease at the time of the Employee's
death.

                                        6

<PAGE>   7

9.   TERMINATION.

     (a) Upon at least 30 days' prior written notice to the Employee, the
Company may terminate the Employee's employment with the Company under this
Agreement only for Cause or in accordance with Section 7 and, subject to the
provisions of Sections 7 and 22, with no liability on its part for further
payments to the Employee. The Company may effect a termination for Cause
pursuant to this Subsection 9 (a) only by the affirmative vote of a majority of
the members of the Board of Directors of the Company. In voting upon such
termination for Cause, if the Employee is also a member of the Board of
Directors of the Company (it is not currently contemplated that Employee will be
elected to the Board of Directors), then he may not vote on, and will not be
considered present for any purpose with respect to, a matter presented to the
Board of Directors of the Company pursuant to this Subsection 9 (a).

     (b) The Employee may terminate his employment with the Company under this
Agreement by giving at least 90 days' prior written notice of his desire to
terminate employment to the Board of Directors of the Company. If the Employee's
employment with the Company under this Agreement is terminated pursuant to this
Subsection 9(b), the Employee will continue to accrue and receive his base
salary in effect at the time pursuant to Subsection 4(a) through the date of
termination with no liability on the part of the Company for further payments to
the Employee, subject to the provisions of Section 22.

     (c) If the Employee's employment with the Company is terminated by the
Company without Cause or if the Employee terminates his employment with the
Company following the occurrence of an Event of Default which has not been
waived in writing by the Employee, the Employee will continue to accrue and
receive his base salary in effect at the time pursuant to Subsection 4(a)
through the date of termination and will be entitled to receive the benefits
provided for under Section 10 (unless the Employee's employment is terminated in
accordance with Section 7) with no liability on the part of the Company for
further payments to the Employee, subject to the provisions of Sections 4(e), 7
and 22.

10.  COMPENSATION AFTER CERTAIN TERMINATIONS.

     If the Employee's employment with the Company is terminated (whether such
termination is by the Employee or by the Company) at any time during the term of
this Agreement for any reason other than (a) termination by the Company for
Cause in accordance with Subsection 9(a); (b) termination by the Company in
accordance with Section 7; (c) the Employee's death; or (d) termination at the
election of the Employee pursuant to Subsection 9(b); then, within five days
after the date of such termination, (i) the Remaining Base Compensation (as
herein defined) which would have been paid to the Employee during the remainder
of the term of this Agreement if termination had not occurred shall become due
and payable and shall be paid to the Employee in a single lump sum in cash, and
(ii) all stock options granted to Employee pursuant to Subsection 4(d) hereof
which are not then exercisable shall, notwithstanding the provisions of any
other agreement, become immediately exercisable

                                        7

<PAGE>   8

and shall remain exercisable until they are exercised or until they otherwise
would expire in accordance with the terms of the Stock Option Plan and agreement
applicable to the exercise of stock options following termination of employment.
For purposes of this Section 10, the "Remaining Base Compensation" shall mean an
amount equal to the annual Base Salary payable to the Employee pursuant to
Subsection 4 (a) at the time of termination and the Anniversary Bonus.

11.  MITIGATION.

     The Employee shall not be required to mitigate the amount of any payment
provided for in this Agreement by seeking other employment or otherwise, nor
shall the amount of any payment provided for in this Agreement be reduced by any
compensation earned by the Employee as the result of employment by another
employer after the date of the termination of the Employee's employment with the
Company, or otherwise.

12.  ENTIRE AGREEMENT.

     This Agreement embodies the entire agreement and understanding between the
parties hereto with respect to the subject matter hereof and supersedes all
prior negotiations, agreements, and understandings relating to such subject
matter, and may be modified or amended only by an instrument in writing signed
by the parties hereto.

13.  LAW TO GOVERN.

     This Agreement is executed and delivered in the State of Texas and shall be
governed, construed and enforced in accordance with the laws of the State of
Texas, except that the arbitration provision of Section 28 is governed by the
Federal Arbitration Act.

14.  ASSIGNMENT.

     This Agreement is personal to the parties, and, except as expressly set
forth in this Section 14, neither this Agreement nor any interest herein may be
assigned (other than by will or by the laws of descent and distribution) without
the prior written consent of the parties hereto nor be subject to alienation,
anticipation, sale, pledge, encumbrance, execution, levy, or other legal process
of any kind against the Employee or any of his beneficiaries or any other
person. Notwithstanding the foregoing, the Company shall be permitted to assign
this Agreement without Employee's consent, to InterVoice, or to any corporation
or other business entity succeeding to substantially all of the business and
assets of the Company and/or InterVoice by merger, consolidation, sale of
assets, or otherwise, if the Company and/or InterVoice obtains the assumption of
this Agreement by such successor. Failure by the Company and/or InterVoice to
obtain such assumption prior to the effectiveness of such succession by any such
corporation or other business entity, with the exception of InterVoice, shall be
a breach of this Agreement and shall entitle the Employee to receive
compensation from the Company under this Agreement in the same amount and on the
same terms as he

                                        8

<PAGE>   9

would be entitled to hereunder if his employment had been terminated without
Cause, and, for purposes of implementing the foregoing, the date on which any
such succession becomes effective shall be deemed the date of termination.

15.  BINDING AGREEMENT.

     Subject to the provisions of Section 14 of this Agreement, this Agreement
shall be binding upon and shall inure to the benefit of the Company and the
Employee and their respective representatives, successors, and assigns.

16.  REFERENCES AND GENDER.

     All references to "Sections" and "Subsections" contained herein are, unless
specifically indicated otherwise, references to sections and subsections of this
Agreement. Whenever herein the singular number is used, the same shall include
the plural where appropriate, and words of either gender shall include the other
gender where appropriate.

17.  WAIVER.

     No waiver of any right under this Agreement shall be deemed effective
unless the same is set forth in writing and signed by the party giving such
waiver, and no waiver of any right shall be deemed to be a waiver of any such
right in the future.

18.  NOTICES.

     Except as may be otherwise specifically provided in this Agreement, all
notices required or permitted hereunder shall be in writing and will be deemed
to be delivered when deposited in the United States mail, postage prepaid,
registered or certified mail, return receipt requested, addressed to the party
or parties at 17811 Waterview Parkway, Dallas, Texas 75252, or at such other
addresses as may have theretofore been specified by written notice delivered in
accordance herewith.

19.  OTHER INSTRUMENTS.

     The parties hereto covenant and agree that they will execute such other and
further instruments and documents as are or may become necessary or convenient
to effectuate and carry out the terms of this Agreement.

20.  HEADINGS.

     The headings used in this Agreement are used for reference purposes only
and do not constitute substantive matter to be considered in construing the
terms of this Agreement.

                                        9

<PAGE>   10

21.  INVALID PROVISION.

     Any clause, sentence, provision, section, subsection, or paragraph of this
Agreement held by a court of competent jurisdiction to be invalid, illegal, or
ineffective shall not impair, invalidate, or nullify the remainder of this
Agreement, but the effect thereof shall be confined to the clause, sentence,
provision, section, subsection, or paragraph so held to be invalid, illegal or
ineffective.

22.  RIGHTS UNDER PLANS AND PROGRAMS.

     Anything in this Agreement to the contrary notwithstanding, no provision of
this Agreement is intended, nor shall it be construed, to reduce or in any way
restrict any benefit to which the Employee may be entitled under any other
agreement, plan, arrangement, or program providing benefits for the Employee
which is not referenced in this Agreement or in a Schedule to this Agreement.

23.  MULTIPLE COPIES.

     This Agreement may be executed simultaneously in one or more counterparts,
each of which shall be deemed an original and all of which shall together
constitute one and the same instrument. The terms of this Agreement shall become
binding upon each party from and after the time that he or it executed a copy
hereof. In like manner, from and after the time that any party executes a
consent or other document, such consent or other document shall be binding upon
such parties.

24.  WITHHOLDING OF TAXES.

     The Company may deduct and withhold from any amounts payable under this
Agreement all federal, state, city, or other taxes as shall be required pursuant
to any law or government regulation or ruling.

25.  ENFORCEABILITY

     Each party to this Agreement acknowledges and represents that such party
has all requisite rights, power and authority to enter into this Agreement, and
that this Agreement, the terms and conditions of this Agreement, and the
transactions and obligations contemplated by this Agreement, will not result in
a breach of any agreement the party has with any third party.

26.  SET OFF OR COUNTERCLAIM.

     Except with respect to any claim against or debt or other obligation of the
Employee to the Company properly recorded on the books and records of the
Company or referred to in this Agreement, there shall be no right of set off or
counterclaim against, or delay in, any payment by the Company to the Employee or
his beneficiaries provided for in this Agreement in respect

                                       10

<PAGE>   11
of any claim against or debt or other obligation of the Employee, whether
arising hereunder or otherwise.

27.  ASSIGNMENT, PROTECTION AND CONFIDENTIALITY OF PROPRIETARY INFORMATION.

     The Employee acknowledges and agrees that all items of the Company's
Proprietary Information constitute valuable, special and unique assets and trade
secrets of its business, which provide to the Company a competitive advantage
over others who do not have access thereto and access to which is essential to
the performance of the Employee's duties hereunder. The Employee shall not,
during the term of this Agreement or thereafter, use or disclose any Proprietary
Information that is not otherwise publicly available, in whole or in part, for
his benefit or for the benefit of any other person or party, except for the
Company. As used herein, "Proprietary Information" includes, but is not limited
to, customer lists and prices, whether current or prospective, product designs
or other product information, experimental developments and other research and
development information, testing processes, marketing studies and research
activities, and any other trade secrets concerning the Company, its
shareholders, officers, directors, employees, business prospects, customers,
transactions, finances, affairs, opportunities, operations, properties or
assets. The Employee further agrees that all inventions, devices, compounds,
processes, formulas, techniques, improvements and modifications which he may
develop, in whole or in part, during the term of his employment or through or
with the facilities, equipment or resources of the Company shall be and remain
the sole and exclusive property of the Company. The Employee agrees to deliver
to the Company at any time the Company may request, all memoranda, notes, plans,
records, reports, and other documents (including copies thereof and all
embodiments thereof whether in computerized form or any other medium) relating
to the business or affairs of the Company or its subsidiaries which he may then
possess or have under his control. The Employee shall maintain in good condition
all tangible and other forms of Proprietary Information in the Employee's
custody or control until his obligations under the preceding sentence are
satisfied. The Employee agrees to execute all documents and take such other
actions as may be required to comply with this Section.

28.  ARBITRATION.

     Any dispute arising in connection with this Agreement or in any way arising
out of or related to the employment relationship between the Employee and the
Company, or the termination of that relationship, including any claim of
unlawful discrimination, shall be finally resolved by arbitration in Dallas,
Texas, governed by the Federal Arbitration Act and conducted pursuant to and in
accordance with the National Rules for the Resolution of Employment Disputes of
the American Arbitration Association. Either the Company or the Employee may
request arbitration by sending written notice to the other party. In any such
arbitration, the only issues to be considered and determined by the
arbitrator(s) shall be issues pertaining to legal and equitable rights and
obligations of the parties under this Agreement and any applicable law. A
decision and award of the arbitrator(s) shall be final, and may be

                                       11

<PAGE>   12

entered in any court having jurisdiction thereof, and application may be made to
such court for judicial acceptance and/or an order enforcing such decision
and/or award. Judicial review of any decision or award shall be in accordance
with the Federal Arbitration Act, except that review of any award of punitive or
exemplary damages shall be conducted as if the award of such damages were made
by a jury sitting in a federal district court in Dallas, Texas. In the event the
arbitrator(s) determine there is a prevailing party in the arbitration, the
prevailing party shall recover from the losing party all costs of arbitration,
including but not limited to the fees of the arbitrator(s) and reasonable
attorneys' fees incurred by the prevailing party. The provisions of this Section
28 shall not be construed to limit or to preclude either party from bringing an
action in any court of competent jurisdiction for injunctive relief.

     IN WITNESS WHEREOF, the parties have executed this Agreement on the day and
year first above written.

                                BRITE VOICE SYSTEMS, INC.

                                By: /s/ DAVID BERGER
                                   ---------------------------------------------
                                Name:  David Berger
                                    --------------------------------------------
                                Title: President and Chief Operating Officer
                                     -------------------------------------------

                                EMPLOYEE

                                /s/ DONALD R. WALSH
                                ------------------------------------------------
                                Name:  Donald R. Walsh
                                     -------------------------------------------

                                       12

<PAGE>   13
                                   SCHEDULE A

The details of the annual bonus will need to be structured in detail based on
plan levels to be established as part of completing the merger and integration
plans. However, the following are the key components and levels that will be
followed:

PLAN COMPONENTS

o    InterVoice Revenue/Earnings

o    Operating Unit Revenue/Earning (Expense)

o    Individual Objectives

* PAYOUT

o    Plan Performance Results in Bonus = 50% of Base Salary

o    Thresholds - 80% of Plan Performance = $0 Payout

o    Maximum Payout = 100% of Base Salary under the Overdrive Plan

o    Overdrive Plan

           o   Payout = 2X at 120% of Plan Performance

           o   X = 50% of Base Salary

 *    Employee will be employed under this Agreement for only eight months of
      InterVoice's fiscal year ending February 28, 2000; accordingly, Employee's
      bonus under this Agreement for such fiscal year will be pro-rated based on
      the eight-month period between the effective date of this Agreement and
      the end of the fiscal year (i.e., for fiscal 2000, the Maximum Pay-out
      under this Agreement cannot exceed two-thirds of Employees' annual Base
      Salary). Any quarterly bonus payable to Employee by Company for any
      Company calendar quarter completed prior to the effective date of this
      Agreement will be paid to Employee in accordance with Employee's quarterly
      bonus plan in effect prior to the effective date of this Agreement.

                                       13

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