This Agreement (together with the Schedules and Annexes to this Agreement), that certain Mutual Non-Disclosure Agreement, dated as of January 31, 2018, by and between Sonus Networks, Inc. (d.b.a. Ribbon Communications Operating Company) and the Company (the “ Confidentiality Agreement ”), the engagement letter entered into between the Company and the Holder Representative and the certificates and other agreements contemplated hereby and thereby constitute the entire agreement among the parties relating to the transactions contemplated hereby and supersede any other agreements, whether written or oral, that may have been made or entered into by or among any of the parties hereto or any of their respective Subsidiaries relating to the transactions contemplated hereby. No representations, warranties, covenants, understandings or agreements, oral or otherwise, relating to the transactions contemplated hereby exist between Company, Buyer and Merger Sub, except as expressly set forth in this Agreement, the Confidentiality Agreement and the certificates and other agreements contemplated hereby and thereby. Notwithstanding anything herein or therein to the contrary, the Confidentiality Agreement shall terminate at the earlier of (i) the Effective Time and (ii) the date of its expiration in accordance with its terms.