EXHIBIT 10.1
EMPLOYMENT SEPARATION AGREEMENT
     THIS EMPLOYMENT SEPARATION AGREEMENT (the “Agreement”), which includes
Exhibits A, B and C hereto which are incorporated herein by this reference, is
entered into by and between TEKELEC, a California corporation (sometimes
referred to herein as “Tekelec” or “Company”), and FRED LAX (sometimes referred
to herein as “Employee” or “Employee”), and shall become effective when executed
by both parties hereto (the “Effective Date”).
RECITALS
     A. Employee will cease to be an employee and officer of Tekelec at 5:00
p.m., California time, on January 1, 2006, (the “Termination Date”).
     B. Employee desires to receive severance benefits under Tekelec’s Officer
Severance Plan dated May 14, 1993, as amended to date (the “Severance Plan”),
which benefits are stated in the Severance Plan to be contingent upon, among
other things, Employee’s entering into this Agreement and undertaking the
obligations set forth herein.
     C. Tekelec and Employee desire to set forth their respective rights and
obligations with respect to Employee’s separation from Tekelec and to finally
and forever settle and resolve all matters concerning Employee’s past services
to Tekelec.
AGREEMENT
     NOW, THEREFORE, in consideration of the foregoing recitals and the mutual
covenants and conditions set forth herein, the receipt and sufficiency of which
are hereby acknowledged, Tekelec and Employee hereby agree as follows:

1.   DEFINITIONS

     As used herein, the following terms shall have the meanings set forth
below:
     1.1 “Includes;” “Including.” Except where followed directly by the word
“only,” the terms “includes” or “including” shall mean “includes, but is not
limited to,” and “including, but not limited to,” respectively.
     1.2 “Severance Covered Period.” The term “Severance Covered Period” shall
mean a period of time commencing upon January 2, 2006 and ending on the date on
which the last installment of the Severance Allowance is due and payable
pursuant to Section 5.1 of this Agreement.
     1.3 Other Capitalized Terms. Capitalized terms (other than those
specifically defined herein) shall have the same meanings ascribed to them in
the Severance Plan.

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2.   MUTUAL REPRESENTATIONS, WARRANTIES AND COVENANTS

     Each party hereto represents, warrants and covenants (with respect to
itself/himself only) to the other party hereto that, to its/his respective best
knowledge and belief as of the date of each party’s respective signature below:
     2.1 Full Power and Authority. It/he has full power and authority to
execute, enter into and perform its/his obligations under this Agreement; this
Agreement, after execution by both parties hereto, will be a legal, valid and
binding obligation of such party enforceable against it/him in accordance with
its terms; it/he will not act or omit to act in any way which would materially
interfere with or prohibit the performance of any of its/his obligations
hereunder, and no approval or consent other than as has been obtained of any
other party is necessary in connection with the execution and performance of
this Agreement.
     2.2 Effect of Agreement. The execution, delivery and performance of this
Agreement and the consummation of the transactions hereby contemplated:
          (a) will not interfere or conflict with, result in a breach of,
constitute a default under or violation of any of the terms, provisions,
covenants or conditions of any contract, agreement or understanding, whether
written or oral, to which it/he is a party (including, in the case of Tekelec,
its bylaws and articles of incorporation each as amended to date) or to which
it/he is bound;
          (b) will not conflict with or violate any applicable law, rule,
regulation, judgment, order or decree of any government, governmental agency or
court having jurisdiction over such party; and
          (c) has not heretofore been assigned, transferred or granted to
another party, or purported to assign, transfer or grant to another party, any
rights, obligations, claims, entitlements, matters, demands or causes of actions
relating to the matters covered herein.

3.   CONFIDENTIALITY OBLIGATIONS

     Employee acknowledges that any confidentiality, proprietary rights or
nondisclosure agreement(s) in favor of Tekelec which he may have entered into in
connection with his employment (collectively, the “Nondisclosure Agreement”)
with Tekelec is understood to be intended to survive, and does survive, any
termination of such employment, and accordingly nothing in this Agreement shall
be construed as terminating, limiting or otherwise affecting any such
Nondisclosure Agreement or Employee’s obligations thereunder. Without limiting
the generality of the foregoing, no time period set forth in this Agreement
shall be construed as shortening or limiting the term of any such Nondisclosure
Agreement, which term shall continue as set forth therein.

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4.   ANNOUNCEMENT; SERVICE AND PAYMENTS UNTIL TERMINATION

     4.1 Announcement of Resignation; Service through Termination Date. At a
time to be determined by the Board, Employee’s resignation will be announced and
an appropriate press statement
will be issued. Through the Termination Date, Employee shall continue to perform
his duties and responsibilities subject to the direction and control of the
Board of Directors, faithfully comply with the Board of Director’s directions
and instructions, strictly adhere to all Tekelec policies, and cooperate fully
with the Board of Directors and the other officers and employees of Tekelec to
ensure a smooth, positive and non-disruptive transition. Employee will
voluntarily take at least five days of accrued vacation at a time of his
choosing between the date of this Agreement and December 31, 2005, but he shall
not be obligated to use more than five such accrued vacation days during the
remaining term of his employment.
     4.2 Payments to Employee. Tekelec will pay any and all salary and accrued
but unpaid vacation owed by Tekelec to Employee up to and including the
Termination Date. Employee will be eligible for the 2005 Q4 bonus which shall be
calculated and paid in accordance with the terms and conditions of the Company’s
2005 Executive Officer Bonus Plan (“2005 Bonus Plan”). Tekelec agrees to waive
the requirement that Employee must remain in active status through the bonus
payment date. Employee shall receive 100% of his 2005 MBO bonus, which shall be
calculated and paid in accordance with the Company’s 2005 Bonus Plan.
     4.3 Post-Employment Consulting. In consideration for the Severance
Allowance and Benefits described in Section 5 below, which Employee acknowledges
are more than he is entitled to receive under the terms of the Tekelec Officer
Severance Plan, Employee agrees that during the period from January 2 through
June 30, 2006, upon Tekelec’s request he will provide litigation-related
consulting or other work (including work that is subject to the provisions of
Section 11 (Cooperation) below), for up to fifty (50) hours, for which he will
not be eligible to receive any per diem compensation, bonus, employee benefits,
stock options or other emolument except for reimbursement for pre-approved,
reasonable expenses, which expenses shall be charged and paid in accordance with
Tekelec expense reimbursement policy.

5.   SEVERANCE ALLOWANCE AND BENEFITS

     In consideration for the release by Employee set forth herein (including
the release of any and all claims Employee has or may have under the Age
Discrimination in Employment Act (“ADEA”) and Older Workers Benefit Protection
Act (“OWBPA”)) and Employee’s performance of his obligations under this
Agreement (including but not limited to Employee’s obligations under Section 7
hereof), Employee is entitled to receive, and Tekelec shall pay to Employee the
severance benefits set forth below:
     5.1 Severance Allowance. Tekelec will pay to Employee a Severance Allowance
calculated in accordance with the following formula: 1.5 times the sum of
$525,000 plus Employee’s actual bonus payments earned and paid for services
rendered in 2005 under the 2005 Bonus Plan, as shown on the Company’s payroll
records. The Severance Allowance shall be payable in 12 monthly installments,
less all applicable withholding taxes, as follows: (1) an

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installment of $300,000 shall be payable on January 15, 2006; (2) an installment
of $300,000 shall be payable on February 15, 2006; (3) an installment of
$300,000 shall be payable on March 15, 2006; and (4) the remaining balance due
shall be payable in nine (9) equal monthly installments commencing on April 15,
2006 with the final installment payable on December 15, 2006. All payments shall
be made in accordance with the terms and conditions of the Severance Plan
(except as specifically modified by this Section 5.1).
     5.2 Life Insurance Continuation. Tekelec (at its expense) will continue,
for a period of 18 months following the Termination Date and provided that
Employee remains insurable (under the same underwriting criteria and at a
premium not exceeding 110% of the premium being paid at such Termination Date)
during such 18 months, such term life insurance in like amount and on the same
terms and conditions as is in effect for such officer immediately prior to his
Termination Date.
     5.3 Health Care Insurance Continuation. Tekelec (at its expense) will
continue, for a period of 18 months following the Termination Date, health care
coverage for Employee and his family members who are “qualified beneficiaries”
(as such term is defined in the Consolidated Omnibus Budget Reconciliation Act
of 1985 (“COBRA”)) under Tekelec’s group health plan(s) generally available
during such period to employees participating in such plan(s) and at levels and
with coverage no greater than those provided to such Employee as of the
Termination Date. Thereafter, Employee (at his expense) may elect coverage under
a conversion health plan available under Tekelec’s group health plan(s) from the
Company’s health insurance carrier if and to the extent he is entitled to do so
as a matter of right under federal or state law.
     5.4 Other Benefit Plans. Except as otherwise expressly provided in this
Section 5 or as required by applicable law, Employee shall have no right to
continue his participation in any Tekelec benefit plan following his termination
on January 1, 2006.

6.   STOCK OPTIONS

     Exhibit A hereto sets forth any and all outstanding stock options, warrants
and other rights to purchase capital stock or other securities of Tekelec which
have been previously issued to Employee and which are outstanding as of the date
hereof. The parties understand and agree that Employee’s option installments
that are scheduled to vest prior to January 1, 2006, shall vest in accordance
with the vesting schedules for such options. The time period through which
Employee may exercise his vested stock options as of the Termination Date shall
expire in accordance with the terms of the stock option plans under which
Employee’s options were granted; provided, however, that Tekelec agrees that the
time period through which Employee may to extend the exercise period to June 30,
2006, with respect to all options described in Exhibit A other than the 146,875
options granted on January 31, 2003, Except as expressly set forth herein,
nothing in this Agreement shall alter or affect any of such outstanding stock
options, warrants or rights or Employee’s rights or responsibilities with
respect thereto, including but not limited to Employee’s rights to exercise any
of his options, warrants or rights following the Termination Date.

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7.   NON-COMPETITION AND NON-SOLICITATION

     7.1 Subject and in addition to Employee’s existing fiduciary duties as a
former officer and employee of Tekelec to the extent such continues under
applicable law after Employee’s Termination Date, provided that Tekelec has not
breached any of the terms of this Agreement or any other currently existing
written agreements between Tekelec and Employee, Employee agrees until the
earlier of (i) the completion of the Severance Covered Period or (ii) such date
as Tekelec may terminate this Agreement for default hereunder:
          (a) Not to engage, either directly or indirectly, in any Competing
Business Activity (as defined below) or be associated with a Competing Business
Entity (as defined below) as an officer, director, employee, principal,
consultant, lender, creditor, investor, agent or otherwise for any corporation,
partnership, company, agency, person, association or any other entity; provided,
however, that nothing contained herein shall prevent Employee from owning not
more than 5% of the common equity and not more than 5% of the voting power of,
or lending not more than $25,000 to, any Competing Business Entity or any
business engaged in a Competing Business Activity; provided, further, that for
purposes of this agreement, any equity ownership, voting control or lending
activity of Employee shall be deemed to include that of (i) any family member or
(ii) person or entity controlled by Employee;
          (b) Not to call upon or cause to be called upon, or solicit or assist
in the solicitation of, in connection with any Competing Business Entity or
Competing Business Activity, any entity, agency, person, firm, association,
partnership or corporation that is a customer or account of Tekelec, currently
and/or during the Severance Covered Period, for the purpose of selling, renting,
leasing, licensing or supplying any product or service that is the same as,
similar to or competitive with the products or services then being sold or
developed by Tekelec;
          (c) Not to enter into an employment or agency relationship with a
Competing Business Entity or involving a Competing Business Activity with any
person who, at the time of such entry, is an officer, director, employee,
principal or agent of or with respect to Tekelec; and
          (d) Not to induce or attempt to induce any person described in
Section 7.1(c) to leave his employment, agency, directorship or office with
Tekelec.
     7.2 For purposes of this Section 7, a “Competing Business Activity” shall
mean any business activity of a person or entity (other than Tekelec) involving
the development, design, manufacture, distribution, marketing, licensing,
renting, leasing or selling within the Territory (as defined below) of products
and services which are the same as, similar to or competitive with products or
services of Tekelec then in existence or under development. For purposes hereof,
the Territory shall include the United States of America, Canada, Central
America, South America, Europe, Japan, Australia, Singapore, China, India and
such other countries in which Tekelec then distributes, markets, licenses,
rents, leases or sells its products or services. An entity as a whole shall be
deemed to be a Competing Business Entity if it has one or more business
activities involving the development, design, manufacture, distribution,
marketing, licensing, renting,

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leasing or selling directly or indirectly within the Territory of products or
services which are the same as, similar to or competitive with products or
services of Tekelec then being sold or under development and if and only if the
revenues derived directly or indirectly from engaging in such business
activities by such entity represent either more than 3% of the entity’s revenues
or at least $5 million in aggregate sales, or both, for the then-preceding
12-month period.
     7.3 The parties acknowledge that the provisions and obligations set forth
in this Section 7 are an integral part of this Agreement and that in the event
Employee breaches any of the provisions or obligations of this Section 7 or if
he materially breaches any other term, provision or obligation of this
Agreement, then Tekelec, in addition to any other rights or remedy it may have
at law, in equity, by statute or otherwise, shall be excused from its payment
obligations to Employee under the Severance Plan and this Agreement.

8.   CONFIDENTIAL INFORMATION AND TRADE SECRETS

     8.1 Employee hereby recognizes, acknowledges and agrees that Tekelec is the
owner of proprietary rights in certain confidential sales and marketing
information, programs, tactics, systems, methods, processes, compilations of
technical and non-technical information, records and other business, financial,
sales, marketing and other information and things of value. To the extent that
any or all of the foregoing constitute valuable trade secrets and/or
confidential and/or privileged information of Tekelec, Employee hereby further
agrees as follows:
          (a) That, except with prior written authorization from Tekelec’s CEO,
for purposes related to Tekelec’s best interests, he will not directly or
indirectly duplicate, remove, transfer, disclose or utilize, nor knowingly allow
any other person to duplicate, remove, transfer, disclose or utilize, any
property, assets, trade secrets or other things of value, including, but not
limited to, records, techniques, procedures, systems, methods, market research,
new product plans and ideas, distribution arrangements, advertising and
promotional materials, forms, patterns, lists of past, present or prospective
customers, and data prepared for, stored in, processed by or obtained from, an
automated information system belonging to or in the possession of Tekelec which
are not intended for and have not been the subject of public disclosure.
Employee agrees to safeguard all Tekelec trade secrets in his possession or
known to him at all times so that they are not exposed to, or taken by,
unauthorized persons and to exercise his reasonable efforts to assure their
safekeeping. This subsection shall not apply to information that as of the date
hereof is, or as of the date of such duplication, removal, transfer, disclosure
or utilization (or the knowing allowing thereof) by Employee has (i) become
generally known to the public or competitors of Tekelec (other than as a result
of a breach of this Agreement); (ii) been lawfully obtained by Employee from any
third party who has lawfully obtained such information without breaching any
obligation of confidentiality; or (iii) been published or generally disclosed to
the public by Tekelec. Employee shall bear the burden of showing that any of the
foregoing exclusions applies to any information or materials.
          (b) That all improvements, discoveries, systems, techniques, ideas,
processes, programs and other things of value made or conceived in whole or in
part by Employee with respect to any aspects of Tekelec’s current or anticipated
business while an employee of Tekelec are and remain the sole and exclusive
property of Tekelec, and

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Employee has disclosed all such things of value to Tekelec and will cooperate
with Tekelec to insure that the ownership by Tekelec of such property is
protected. All of such property of Tekelec in Employee’s possession or control,
including, but not limited to, all personal notes, documents and reproductions
thereof, relating to the business and the trade secrets or confidential or
privileged information of Tekelec has already been, or shall be immediately,
delivered to Tekelec.
     8.2 Employee further acknowledges that as the result of his prior service
as an officer and employee of Tekelec, he has had access to, and is in
possession of, information and documents protected by the attorney-client
privilege and by the attorney work product doctrine. Employee understands that
the privilege to hold such information and documents confidential is Tekelec’s,
not his personally, and that he will not disclose the information or documents
to any person or entity without the express prior written consent of the CEO or
Board of Tekelec unless he is required to do so by law.
     8.3 Employee’s obligations set forth in this Section 8 shall be in addition
to, and not instead of, Employee’s obligations under any written Nondisclosure
Agreement.

9.   ENFORCEMENT OF SECTIONS 7 AND 8

     Employee hereby acknowledges and agrees that the services rendered by him
to Tekelec in the course of his prior employment were of a special and unique
character, and that breach by him of any provision of the covenants set forth in
Sections 7 and 8 of this Agreement will cause Tekelec irreparable injury and
damages. Employee expressly agrees that Tekelec shall be entitled, in addition
to all other remedies available to it whether at law or in equity, to injunctive
or other equitable relief to secure their enforcement.
     The parties hereto expressly agree that the covenants contained in
Sections 7 and 8 hereof are reasonable in scope, duration and otherwise;
however, if any of the restraints provided in said covenants are adjudicated to
be excessively broad as to geographic area or time or otherwise, said restraint
shall be reduced to whatever extent is reasonable and the restraint shall be
fully enforced in such modified form. Any provisions of said covenants not so
reduced shall remain in full force and effect.

10.   PROHIBITION AGAINST DISPARAGEMENT

     10.1 Employee agrees that for a period of two years following the
Termination Date any communication, whether oral or written, occurring on or off
the premises of Tekelec, made by him or on his behalf to any person or entity
(including, without limitation, any Tekelec employee, customer, vendor,
supplier, any competitor, any media entity and any person associated with any
media) which in any way relates to Tekelec (or any of its subsidiaries) or to
Tekelec’s or any of its subsidiaries’ directors, officers, management or
employees: (a) will be truthful; and (b) will not, directly or indirectly,
criticize, disparage, or in any manner undermine the reputation or business
practices of Tekelec or its directors, officers, management or employees.

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     10.2 The only exceptions to Section 10.1 shall be: (a) truthful statements
privately made to (i) the CEO of Tekelec, (ii) any member of Tekelec’s Board,
(iii) Tekelec’s auditors, (iv) inside or outside counsel of Tekelec,
(v) Employee’s counsel or (vi) Employee’s spouse; (b) truthful statements
lawfully compelled and made under oath in connection with a court or government
administrative proceeding; and (c) truthful statements made to specified persons
upon and in compliance with prior written authorization from Tekelec’s CEO or
Board to Employee directing him to respond to inquiries from such specified
persons.

11.   COOPERATION

     Employee agrees that for a period of five years commencing on January 2,
2006, he will cooperate fully and reasonably with Tekelec in connection with any
future or currently pending matter, proceeding, litigation or threatened
litigation: (1) directly or indirectly involving Tekelec (which, for purposes of
this section, shall include Tekelec and each of its current and future
subsidiaries, successors or permitted assigns); or (2) directly or indirectly
involving any director, officer or employee of Tekelec (with regard to matters
relating to such person(s) acting in such capacities with regard to Tekelec
business). Such cooperation shall include making himself available upon
reasonable notice at reasonable times and places for consultation and to testify
truthfully (at Tekelec’s expense for reasonable, pre-approved out-of-pocket
travel costs plus a daily fee equal to $4,000 for each full or partial day
during which Employee makes himself so available, provided, however, that
Employee shall not be entitled to receive the daily fee of $4,000 with respect
to any work covered by this Section 11 and performed during the period January
2, 2006 through June 30, 2006, until Employee has first completed fifty
(50) hours of consulting work in accordance with Section 4.3 above) in any
action as reasonably requested by the CEO or the Board of Directors. Employee
further agrees to immediately notify Tekelec’s CEO in writing in the event that
he receives any legal process or other communication purporting to require or
request him to produce testimony, documents, information or things in any manner
related to Tekelec, its directors, officers or employees, and that he will not
produce testimony, documents, information or other things with regard to any
pending or threatened lawsuit or proceeding regarding Tekelec without giving
Tekelec prior written notice of the same and reasonable time to protect its
interests with respect thereto. Employee further promises that when so directed
by the CEO or the Board of Directors, he will make himself available to attend
any such legal proceeding and will truthfully respond to any questions in any
manner concerning or relating to Tekelec and will produce all documents and
things in his possession or under his control which in any manner concern or
relate to Tekelec. Employee covenants and agrees that he will immediately notify
Tekelec’s CEO in writing in the event that he breaches any of the provisions of
Sections 7, 8, 10 or 11 hereof.

12.   SOLE ENTITLEMENT

     Employee acknowledges and agrees that his sole entitlement to compensation,
payments of any kind, monetary and nonmonetary benefits and perquisites with
respect to his prior Tekelec relationship (as a member of the Board of Directors
and an officer and employee) is as set forth in the Severance Plan, this
Agreement, the Company’s bonus plan for officers as in effect from time to time,
stock option and warrant agreements, COBRA, and such other written agreements
and securities between Tekelec and Employee as may exist or as may be set forth
on Exhibit B

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hereto. If there is any inconsistency or conflict between this Agreement and the
Officer Severance Plan, the 2005 Executive Officer Bonus Plan, the 1994 Stock
Option Plan, the 2003 Stock Option Plan or any other stock option agreement for
the stock options listed on Exhibit A, the terms of this Agreement shall
control.

13.   RELEASE OF CLAIMS

     13.1 General. Effective as of the Effective Date and as of the Termination
Date, Employee does hereby and forever release and discharge Tekelec and the
predecessor corporation of Tekelec as well as the successors, current, prior or
future shareholders of record, officers, directors, heirs, predecessors,
assigns, agents, employees, attorneys, insurers and representatives of each of
them, past, present or future, from any and all cause or causes of action,
actions, judgments, liens, indebtedness, damages, losses, claims, liabilities
and demands of any kind or character whatsoever, whether known or unknown,
suspected to exist or not suspected to exist, anticipated or not anticipated,
whether or not heretofore brought before any state or federal agency, court or
other governmental entity (“Claims”) which are existing on or arising prior to
the date of this Agreement and the Termination Date and including any Claims
which, directly or indirectly, in whole or in part, relate or are attributable
to, connected with, or incidental to the employment of Employee by Tekelec, the
separation of that employment, and any dealings between the parties concerning
Employee’s employment, excepting only those obligations expressly recited herein
or to be performed hereunder. Nothing contained in this Section 13 shall affect
any rights, claims or causes of action which Employee may have (1) with respect
to his outstanding stock options, warrants or other stock subscription rights to
purchase Tekelec Common Stock or other securities under the terms and conditions
thereof; (2) as a shareholder of Tekelec; (3) to indemnification by Tekelec, to
the extent required under the provisions of Tekelec’s Articles of Incorporation,
Tekelec’s Bylaws, the California General Corporation Law, insurance or
contracts, with respect to matters relating to Employee’s prior service as a
director, an officer, employee and agent of Tekelec; (4) with respect to his
eligibility for severance payments under the Severance Plan or any other written
agreement listed on Exhibit B hereto; and (5) to make claims against or seek
indemnification or contribution from anyone not released by the first sentence
of this Section 13 with respect to any matter or anyone released by the first
sentence of this Section 13 with respect to any matter not released thereby; or
(6) with respect to Tekelec’s performance of this Agreement. Further, Employee
waives specifically any and all rights or claims Employee has or may have under
the ADEA and/or the OWBPA, and acknowledges that such waiver is given
voluntarily in exchange for certain consideration included in the severance
benefits being paid pursuant to this Agreement.
     13.2 Waiver of Unknown Claims. Employee acknowledges that he is aware that
he may hereafter discover claims or facts different from or in addition to those
he now knows or believes to be true with respect to the matters herein released,
and he agrees that this release shall be and remain in effect in all respects a
complete general release as to the matters released and all claims relative
thereto which may exist or may heretofore have existed, notwithstanding any such
different or additional facts. Employee acknowledges that he has been informed
of Section 1542 of the Civil Code of the State of California, and does hereby
expressly waive and relinquish all rights and benefits which he has or may have
under said Section, which reads as follows:

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“A general release does not extend to claims which the creditor does not know or
suspect to exist in his favor at the time of executing the release, which if
known by him must have materially affected his settlement with the debtor.”
     13.3 Covenant Not to Sue on Matters Released. Employee covenants that he
will not make, assert or maintain against any person or entity that Employee has
released in this Agreement, any claim, demand, action, cause of action, suit or
proceeding arising out of or in connection with the matters herein released,
including but not limited to any claim or right under the ADEA, the OWBPA, or
any other federal or state statute or regulation. Employee represents and
warrants that he has not assigned or transferred, purported to assign or
transfer, and will not assign or transfer, any matter or claim herein released.
Employee represents and warrants that he knows of no other person or entity
which claims an interest in the matters or claims herein released. Employee
agrees to, and shall at all times, indemnify and hold harmless each person and
entity that Employee has released in this Agreement against any claim, demand,
damage, debt, liability, account, action or cause of action, or cost or expense,
including attorneys’ fees, resulting or arising from any breach of the
representations, warranties and covenants made herein.

14.   ASSIGNMENT

     Employee represents and warrants that he has not heretofore assigned,
transferred or granted or purported to assign, transfer or grant any claims,
entitlement, matters, demands or causes of action herein released, disclaimed,
discharged or terminated, and agrees to indemnify and hold harmless Tekelec from
and against any and all costs, expense, loss or liability incurred by Tekelec as
a consequence of any such assignment, transfer or grant.

15.   EMPLOYEE REPRESENTATIONS

     Except as listed by Employee on Exhibit C, from the period beginning on
October 24, 2005, to the Effective Date, Employee represents and warrants that
he has not acted or omitted to act in any respect which directly or indirectly
would have constituted a violation of Sections 7, 8, 10 or 11 herein had this
Agreement then been in effect.

16.   MISCELLANEOUS

     16.1 Notices. All notices and demands referred to or required herein or
pursuant hereto shall be in writing, shall specifically reference this Agreement
and shall be deemed to be duly sent and given upon actual delivery to and
receipt by the relevant party (which notice, in the case of Tekelec, must be
from an officer of Tekelec) or five days after deposit in the U.S. mail by
certified or registered mail, return receipt requested, with postage prepaid,
addressed as follows (if, however, a party has given the other party due notice
of another address for the sending of notices, then future notices shall be sent
to such new address):

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  (a) If to Tekelec:   Tekelec
 
      5200 Paramount Parkway
 
      Morrisville, North Carolina 27560
 
      Attn: Ron Buckly, Esq.
 
       
 
  With a copy to:   Lynn K. Thompson, Esq.
 
      Bryan Cave LLP
 
      120 Broadway, Suite 300
 
      Santa Monica, CA 90401
 
       
 
  (b) If to Employee:   Fred Lax  
 
     
 
 
     
 
 
       
 
  with a copy to:   Sheldon H. Lytton
 
      Kelly Lytton & Vann LLP
 
      1900 Avenue of the Stars, Suite 1450
 
      Los Angeles, California 90067-4405

     16.2 Legal Advice and Construction of Agreement. Both Tekelec and Employee
have received (or have voluntarily and knowingly elected not to receive)
independent legal and tax advice with respect to the advisability of entering
into this Agreement and with respect to all matters covered by this Agreement,
and neither has been entitled to rely upon or has in fact relied upon the legal
or other advice of the other party or such other party’s counsel (or employees)
in entering into this Agreement. Without limiting the generality of the
foregoing, Employee has not relied upon the legal or other advice of the General
Counsel of Tekelec.
     16.3 Parties’ Understanding. Tekelec and Employee state that each has
carefully read this Agreement, that it has been fully explained to it/him by
its/his attorney (or that it/he has voluntarily and knowingly elected not to
receive such explanation), that it/he fully understands its final and binding
effect, that the only promises made to it/him to sign the Agreement are those
stated herein, and that it/he is signing this Agreement voluntarily.
     16.4 Recitals and Section Headings. Each term of this Agreement is
contractual and not merely a recital. All recitals are incorporated by reference
into this Agreement. Captions and section headings are used herein for
convenience only, are not part of this Agreement and shall not be used in
interpreting or construing it.
     16.5 Entire Agreement. This Agreement constitutes a single integrated
contract expressing the entire agreement of the parties with respect to the
subject matter hereof and supersedes all prior and contemporaneous oral and
written agreements and discussions with respect to the subject matter hereof.
Notwithstanding the foregoing, the parties understand and agree that any
Nondisclosure Agreement and all other written agreements between Employee and
Tekelec are separate from this Agreement and, subject to the terms and
conditions of each such agreement, shall survive the execution of this
Agreement, and nothing contained in this

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Agreement shall be construed as affecting the rights or obligations of either
party set forth in such agreements.
     16.6 Severability. In the event any provision of this Agreement or the
application thereof to any circumstance shall be determined by arbitration
pursuant to Section 16.10 of this Agreement or held by a court of competent
jurisdiction to be invalid, illegal or unenforceable, or to be excessively broad
as to time, duration, geographical scope, activity, subject or otherwise, it
shall be construed to be limited or reduced so as to be enforceable to the
maximum extent allowed by applicable law as it shall then be in force, and if
such construction shall not be feasible, then such provision shall be deemed to
be deleted herefrom in any action before that court, and all other provisions of
this Agreement shall remain in full force and effect.
     16.7 Amendment and Waiver. This Agreement and each provision hereof may be
amended, modified, supplemented or waived only by a written document
specifically identifying this Agreement and signed by each party hereto. Except
as expressly provided in this Agreement, no course of dealing between the
parties hereto and no delay in exercising any right, power or remedy conferred
hereby or now or hereafter existing at law, in equity, by statute or otherwise,
shall operate as a waiver of, or otherwise prejudice, any such rights, power or
remedy.
     16.8 Cumulative Remedies. None of the rights, powers or remedies conferred
herein shall be mutually exclusive, and each such right, power or remedy shall
be cumulative and in addition to every other right, power or remedy, whether
conferred herein or now or hereafter available at law, in equity, by statute or
otherwise.
     16.9 Specific Performance. Each party hereto may obtain specific
performance to enforce its/his rights hereunder and each party acknowledges that
failure to fulfill its/his obligations to the other party hereto would result in
irreparable harm.
     16.10 Arbitration. Except for the right of either party to apply to a court
of competent jurisdiction for a Temporary Restraining Order to preserve the
status quo or prevent irreparable harm, any dispute or controversy between
Tekelec and Employee under this Agreement involving its interpretation or the
obligations of a party hereto shall be determined by binding arbitration in
accordance with the commercial arbitration rules of the American Arbitration
Association, in the County of Los Angeles, State of California.
     Arbitration may be conducted by one impartial arbitrator by mutual
agreement. In the event that the parties are unable to agree on a single
arbitrator within 30 days of first demand for arbitration, the arbitration shall
proceed before a panel of three arbitrators, one of whom shall be selected by
Tekelec and one of whom shall be selected by Employee, and the third of whom
shall be selected by the two arbitrators selected. All arbitrators are to be
selected from a panel provided by the American Arbitration Association. The
arbitrators shall have the authority to permit discovery, to the extent deemed
appropriate by the arbitrators, upon request of a party. The arbitrators shall
have no power or authority to add to or, except as otherwise provided by
Section 16.6 hereof, to detract from the agreements of the parties, and the
prevailing party shall recover costs and attorneys’ fees incurred in
arbitration. The arbitrators shall have the authority to grant injunctive relief
in a form substantially similar to that which would otherwise be granted

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by a court of law. The arbitrators shall have no authority to award punitive or
consequential damages. The resulting arbitration award may be enforced, or
injunctive relief may be sought, in any court of competent jurisdiction. Any
action arising out of or relating to this Agreement may be filed only in the
Superior Court of the County of Los Angeles, California or the United States
District Court for the Central District of California.
     16.11 California Law and Location. This Agreement was negotiated, executed
and delivered within the State of California, and the rights and obligations of
the parties hereto shall be construed and enforced in accordance with and
governed by the internal (and not the conflict of laws) laws of the State of
California applicable to the construction and enforcement of contracts between
parties resident in California which are entered into and fully performed in
California. Any action or proceeding arising out of, relating to or concerning
this Agreement that is not subject to the arbitration provisions set forth in
Section 16.10 above shall be filed in the state courts of the County of Los
Angeles, State of California or in a United States District Court in the Central
District of California and in no other location. The parties hereby waive the
right to object to such location on the basis of venue.
     16.12 Attorneys’ Fees. In the event a lawsuit is instituted by either party
concerning a dispute under this Agreement, the prevailing party in such lawsuit
shall be entitled to recover from the losing party all reasonable attorneys’
fees, costs of suit and expenses (including the reasonable fees, costs and
expenses of appeals), in addition to whatever damages or other relief the
injured party is otherwise entitled to under law or equity in connection with
such dispute.
     16.13 Force Majeure. Neither Tekelec nor Employee shall be deemed in
default if its/his performance of obligations hereunder is delayed or become
impossible or impracticable by reason of any act of God, war, fire, earthquake,
strike, civil commotion, epidemic, or any other cause beyond such party’s
reasonable control.
     16.14 Counterparts. This Agreement may be executed in two or more
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.
     16.15 Successors and Assigns. Neither party may assign this Agreement or
any of its rights or obligations hereunder (including, without limitation,
rights and duties of performance) to any third party or entity, and this
Agreement may not be involuntarily assigned or assigned by operation of law,
without the prior written consent of the non-assigning party, which consent may
be given or withheld by such non-assigning party in the sole exercise of its
discretion, except that Tekelec may assign this Agreement to a corporation
acquiring: (1) 50% or more of Tekelec’s capital stock in a merger or
acquisition; or (2) all or substantially all of the assets of Tekelec in a
single transaction; and except that Employee may transfer or assign his rights
under this Agreement voluntarily, involuntarily or by operation of law upon or
as a result of his death to his heirs, estate and/or personal representative(s).
Any prohibited assignment shall be null and void, and any attempted assignment
of this Agreement in violation of this section shall constitute a material
breach of this Agreement and cause for its termination by and at the election of
the other party hereto by notice. This Agreement shall be binding upon and inure
to the benefit of each of

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the parties hereto and each person or entity released pursuant to Section 12
hereof and, except as otherwise provided herein, their respective legal
successors and permitted assigns.
     16.16 Payment Procedure. Except as otherwise explicitly provided herein or
in the Severance Plan, all payments by Tekelec to Employee or by Employee to
Tekelec due hereunder may be by, at the paying party’s election, cash, wire
transfer or check. Except as explicitly provided herein or in the Severance
Plan, neither party may reduce any payment or obligation

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due hereunder by any amount owed or believed owed to the other party under any
other agreement, whether oral or written, now in effect or hereafter entered
into.
     16.17 Survival. The definitions, representations and warranties herein as
well as obligations set forth in Sections 7 8 and 10 through 16 shall survive
any termination of this Agreement for any reason whatsoever.
     16.18 No Admission. Neither the entry into this Agreement nor the giving of
consideration hereunder shall constitute an admission of any wrongdoing by
Tekelec or Employee.
     16.19 Limitation of Damages. Except as expressly set forth herein, in any
action or proceeding arising out of, relating to or concerning this Agreement,
including any claim of breach of contract, liability shall be limited to
compensatory damages proximately caused by the breach and neither party shall,
under any circumstances, be liable to the other party for consequential,
incidental, indirect or special damages, including but not limited to lost
profits or income, even if such party has been apprised of the likelihood of
such damages occurring.
     16.20 Pronouns. As used herein, the words “he”, “him”, “his” and “himself”
shall be deemed to refer to the feminine as the identity of the person referred
to and the context may require.
     16.21 Effectiveness. This Agreement shall become effective upon execution
by the later of the parties hereto to execute this Agreement.

17.   21 DAY REVIEW PERIOD; RIGHT TO REVOKE

     Employee acknowledges that he was advised in writing to consult with an
attorney prior to executing this Agreement and represents and warrants to
Tekelec that he has done so, and further acknowledges that he has been given a
period of 21 days within which to consider the terms and provisions of this
Agreement with his attorney. If Employee has executed and delivered to Tekelec
this Agreement prior to the expiration of such 21-day period, then in doing so,
Employee acknowledges that he has unconditionally and irrevocably waived his
right to that unexpired portion of such 21-day period. In addition, Employee
shall have the right to revoke this Agreement for a period of seven days
following the date on which this Agreement is signed by sending written
notification of such revocation directly to Ronald W. Buckly at the Calabasas
offices of Tekelec, via hand delivery.

              TEKELEC   FRED LAX
 
           
By:
  /s/ Ronald W. Buckly   Signature:   /s/ Fred Lax
 
           
Name:
  Ronald W. Buckly        
Title:
  Senior Vice President, Corporate Affairs and General Counsel  
Date:  October 26, 2005
 
           
Date:
  October 26, 2005        

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EXHIBIT A
OUTSTANDING STOCK PURCHASE RIGHTS

                                              Maximum                     Number
of                     Shares   Purchase                 Currently   Price  
Termination Type of Security   Date Issued   Purchasable (1)   Per Share   Date
(2)  
NSO
    03/05/04       131,250     $ 18.80       06/30/06    
NSO
    01/31/03       146,875       8.54       04/01/06    
NSO
    01/18/02       93,750       19.21       06/30/06    
NSO
    02/01/01       350,000       27.56       06/30/06  

 

(1)   As of the close of business on December 31, 2005 after giving effect to
the options scheduled to vest on such date.   (2)   The applicable termination
date after giving effect to the termination of Mr. Lax’s employment on
January 1, 2006 and the amendment of Mr. Lax’s options in accordance with the
terms of Mr. Lax’s Separation Agreement.

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EXHIBIT B
LIST OF OTHER AGREEMENTS (Pursuant to §§12 and 13)
NONE

 

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EXHIBIT C
EXCEPTIONS (Pursuant to §15)
NONE