EXHIBIT A WAIVER AND RELEASE AGREEMENT

an aggregate gross amount of $560,000, less lawful deductions, payable as follows: (i) $90,000, less lawful deductions, on the first payroll date after the expiration of the seven (7) day revocation period described in Section 10, (ii) $225,000, less lawful deductions, payable on August 21, 2015, (iii) $95,000 on November 27, 2015, (vi) $60,000 on February 26, 2016, and (v) $90,000 on April 8, 2016.     

a pro-rata portion of your Cash Bonus for the fiscal year ending January 31, 2016 (determined by multiplying the amount of the Cash Bonus you would have been entitled to receive for the full fiscal year ending January 31, 2015 based on actual company and individual performance, by a fraction, the numerator of which is the number of days during the fiscal

in respect of equity, (i) shares to be issued to you upon vesting and settlement of certain of your restricted stock unit awards (“RSUs”) as of the Separation Date as set forth in Exhibit B hereto, and (ii) vesting as of the Separation Date of certain of your stock option awards as set forth in Exhibit B hereto.     Any vested stock option may be exercised by you following the Separation Date subject to and in accordance with the terms of the Employment Agreement and the applicable stock option award agreement.     For the avoidance of doubt, the number of vested RSUs and stock options set forth in Exhibit B shall be in addition to your RSUs and options (or other equity grants) that have vested, or shall be vested, prior to the Separation Date.     

Provided that you properly elect to continue your health coverage under COBRA, the Company will contribute toward the cost of your COBRA premiums in the same amount as if you were actively employed (provided that you timely pay your portion of such COBRA premium), with such contribution ending on the earlier of (i) 12 months from the Separation Date; or (ii) the date on which you become eligible for coverage under the group health plan of another employer. Thereafter, you will be personally responsible for the full cost of any COBRA premiums. You agree to notify the Company immediately upon becoming eligible for coverage under the group health plan of another employer during the period in which the Company is contributing toward the cost of your COBRA coverage. Such payments by the Company will be treated as taxable income to you and amounts will be withheld from the severance payments under Section 3(a) to cover the Company’s tax withholding obligation with respect to these payments.

You shall not, use or disclose to any third party any Confidential Information for any reason or purpose whatsoever without the express written consent of the Company; and

You agree that you shall observe in strict compliance the provisions of Section 8 of the Employment Agreement. For the sake of clarity and for removal of doubt, without derogating from Section 8 of the Employment Agreement, you agree that (i) Executive working for, or (ii) any involvement of the Executive with, or the provision of services or other engagement by the Executive with, a business unit or division of Metaswitch Networks, their respective affiliates, parents and subsidiaries, or any entity in such competitors’ group, which engages in a “Competitive Business” (as defined by the Employment Agreement) before the lapse of one (1) year from the Separation Date, shall be regarded as a breach of the Employment Agreement, this Letter and any agreement you executed with the Company relating to inventions, confidentiality, non-disclosure, non-solicitation and/or non-competition.

Executive expressly waives and releases the Company and its affiliates, their respective affiliates and related entities, parent corporations and subsidiaries, and all current and former directors, administrators, supervisors, managers, agents, officers, partners, stockholders, attorneys, insurers and employees of the Company and their affiliates, related entities, parent corporations and subsidiaries, and their successors and assigns, from any and all claims, actions, and causes of action, at law or in equity, known or unknown, including those directly or indirectly relating to or connected with Executive’s employment with the Company or termination of such employment including but not limited to any claim related to additional compensation, any claim or right to receive equity securities of the Company (if any) and any and all claims under the National Labor Relations Act, as amended; Title VII of the Civil Rights Act of 1964, as amended; Sections 1981 through 1988 of Title 42 of the United States Code, as amended; the Age Discrimination in Employment Act of 1967, as amended; the Older Workers Benefit Protection Act; the Immigration Reform Control Act, as amended; the Employee Retirement Income Security Act of 1974, 29 U.S.C. § 1001, et seq.; the Occupational Safety and Health Act, as amended; the Civil Rights Act of 1866, 29 U.S.C. § 1981, et seq; the Rehabilitation Act of 1973, 29 U.S.C. § 701, et seq.; the Americans With Disabilities Act of 1990, as amended; the Civil Rights Act of 1991; the Family and Medical Leave Act; the Equal Pay Act; the Genetic Information Nondiscrimination Act (“GINA”); the Massachusetts Law Against Discrimination, G.L. c. 151B; the Massachusetts Wage Payment Statute, G.L. c. 149, §§ 148, 148A, 148B, 149, 150,150A-150C, 151, 152, 152A, et seq.; the Massachusetts Wage and Hour laws, G.L. c. 151§1A et seq.; the Massachusetts Privacy Statute, G.L. c. 214, § 1B; the Massachusetts Sexual Harassment Statute, G.L. c. 214 § 1C; the Massachusetts Civil Rights Act, G.L. c. 12, § 11H; the Massachusetts Equal Rights Act, G.L. c. 93, § 102;, as such Acts have been amended, and all other forms of employment claims whether under federal, state or local statute or ordinance, wrongful termination, retaliatory discharge, breach of express implied, or oral contact, interference with contractual relations, defamation, intentional infliction of emotional distress and any other tort or contact claim under common law of any state or for attorneys’ fees, based on any act, transaction, circumstance or event arising up to and including the date of Executive’s execution of this Release; provided, however, nothing herein shall limit or impede Executive’s right to file or pursue an administrative charge with, or participate in, any investigation before the Equal Employment Opportunity Commission (“EEOC”), or any similar local, state or federal agency. Executive agrees, however, that if Executive or

Executive acknowledges: (a) that Executive is advised in writing hereby to consult with any attorney before signing this Release, and (b) that Executive has had at least twenty-one (21) days after receipt to consider whether to accept or reject this Release. Executive understands that Executive may sign this Release prior to the end of such twenty-one (21) day period, but is not required to do so. In addition, Executive has seven (7) days after Executive signs this Release to revoke it as provided for in the Letter. If Executive revokes this Release as provided herein, it shall be null and void and Executive shall not be entitled to the monies and/or benefits provided for in the Letter.

Executive and the Company agree that neither this Release nor the performance hereunder constitutes an admission by the Company of any violation of any federal, state or local law, regulation, or common law, or any breach of any contract or any other wrongdoing of any type.

/s/ Kathleen Harris