Exhibit 1

JOINT FILING AGREEMENT

The undersigned hereby agree that they are filing this statement jointly pursuant to Rule 13d-1(k)(1). Each of them is responsible for the timely filing of such Schedule 13D and any amendments thereto, and for the completeness and accuracy of the information concerning such person contained therein; but none of them is responsible for the completeness or accuracy of the information concerning the other persons making the filing, unless such person knows or has reason to believe that such information is inaccurate.

In accordance with Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree to the joint filing with each other on behalf of each of them of such a statement on Schedule 13D with respect to the Common Stock of Sonus Networks, Inc. beneficially owned by each of them. This Joint Filing Agreement shall be included as an exhibit to such Schedule 13D.

IN WITNESS WHEREOF, the undersigned hereby execute this Joint Filing Agreement as of the 6^th day of November, 2017.

JPMORGAN CHASE & CO.
By:	/s/ Michael T. Lees
Name:	Michael T. Lees
Title:	Executive Director
OEP III CO-INVESTORS, L.P.
By:	OEP Co-Investors Management III, Ltd., as General Partner
By:	/s/ Richard W. Smith
Name:	Richard W. Smith
Title:	President
OEP II PARTNERS CO-INVEST, L.P.
By:	OEP II Partners Co-Invest, GP, Ltd., its General Partner
By:	/s/ Richard M. Cashin
Name:	Richard M. Cashin
Title:	Director
HERITAGE PE (OEP) III, L.P.
By:	OEP General Partner III, L.P., as General Partner
By:	JPMC Heritage Parent LLC, as General Partner
By:	/s/ Richard W. Smith
Name:	Richard W. Smith
Title:	President