Maurice Castonguay c/o Sonus Networks, Inc. Westford, MA 01886 Dear Moe:Sonus Networks Inc • July 29th, 2013 • Services-computer integrated systems design
We appreciate your contributions to the growth of Sonus Networks, Inc. during your tenure as the Company’s Chief Financial Officer. Now, you have expressed a desire to pursue opportunities outside of Sonus, while offering to provide an orderly transition of your duties and responsibilities until the date of your separation from the Company. To that end, this letter sets forth the agreement between you and the Company with respect to this transition period (the “Retention Agreement”) and amends your employment agreement dated August 24, 2011, which was previously amended on October 25, 2011, February 15, 2013, and March 28, 2013 (collectively, the August 24, 2011 letter and all prior amendments will be referred to as the “Employment Agreement”).
