JOINT FILING AGREEMENT

Exhibit 99.4

JOINT FILING AGREEMENT

The undersigned hereby agree that this Schedule 13D, dated February 11, 2020, with respect to the Common Stock, par value $0.01 per share, of Plantronics, Inc., a Delaware corporation, is, and any amendments hereto signed by each of the undersigned shall be, filed on behalf of each of us pursuant to and in accordance with the provisions of Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended.

February 11, 2020

		TRIANGLE PRIVATE HOLDINGS II, LLC
		By:	/s/ Xxxxx Xxxxxx
		Name:	Xxxxx Xxxxxx
		Title:	Authorized Signatory
		TRIANGLE PRIVATE HOLDINGS I, LLC
		By:	/s/ Xxxxx Xxxxxx
		Name:	Xxxxx Xxxxxx
		Title:	Authorized Signatory
		TRIANGLE PRIVATE INVESTMENTS, LLC
		By:	/s/ Xxxxx Xxxxxx
		Name:	Xxxxx Xxxxxx
		Title:	Authorized Signatory
		SIRIS PARTNERS III, L.P. SIRIS PARTNERS III PARALLEL, L.P.
		By:	Siris Partners GP III, L.P., its general partner
		By:	Siris GP HoldCo III, LLC, its general partner
		By:	/s/ Xxxxx Xxxxxx
		Name:	Xxxxx Xxxxxx
		Title:	Managing Member
		SIRIS PARTNERS GP III, L.P.
		By:	Siris GP HoldCo III, LLC, its general partner
		By:	/s/ Xxxxx Xxxxxx
		Name:	Xxxxx Xxxxxx
		Title:	Managing Member

SIGNATURE PAGE TO JOINT FILING AGREEMENT

1

		SIRIS GP HOLDCO III, LLC
		By:	/s/ Xxxxx Xxxxxx
		Name:	Xxxxx Xxxxxx
		Title:	Managing Member
		SIRIS CAPITAL GROUP III, L.P.
		By:	Siris Advisor HoldCo III, LLC, its general partner
		By:	/s/ Xxxxx Xxxxxx
		Name:	Xxxxx Xxxxxx
		Title:	Manager
		SIRIS CAPITAL GROUP, LLC
		By:	Siris Advisor HoldCo, LLC, its managing member
		By:	/s/ Xxxxx Xxxxxx
		Name:	Xxxxx Xxxxxx
		Title:	Manager
		SIRIS GROUP GP, LLC
		By:	/s/ Xxxxx Xxxxxx
		Name:	Xxxxx Xxxxxx
		Title:	Manager

SIGNATURE PAGE TO JOINT FILING AGREEMENT

2