*Discontinued* by Plantronics,  See Plantronics APS-11 Savi/CS500  instead

Plantronics APS-1 Electronic Hookswitch (EHS) for "legacy" Plantronics CS wireless Headsets (i.e. CS55, CS50, CS70N, CS351N, CS361N) works with the following telephone models:

Aastra: OpenPhone 71, OpenPhone 73, OpenPhone 75, OpenPhone 73 IP, OpenPhone 75 IP, Office 70, Office 80, Office 70IP, Office 80IP

Aastra  T6739i,  6771, 6773, 6775, 6773 IP, 6775IP, 5370, 5380, 5370 IP, 5380 IP

Aastra 53i, 55i, 57i, 57i CT, 6753i*, 6755i*, 6757i*, 6757i CT* -  *These phones require Part#: D0062-0011-34-00 (“DHSG CABLE KIT”) from us. (require Aastra software 2.4 or newer)

Siemens OpenStage 40, OpenStage 60, OpenStage 80, Optipoint 410 with acoustic adaptor, Optipoint 420 with acoustic adaptor, Optipoint 500 with acoustic adaptor, Optipoint 600 with acoustic adaptor

Agfeo ST30 (HS-Module 30 required), ST31, ST40

Auserwald COMfortel 2500

Funkwerk CS290-U, CS410, CS410-U, IP-S400

Swyx L420s, L440, L520s, L540

T-Com Comfort Pro 100, Comfort Pro 300, Comfort Pro 300 IP, Comfort Pro 500, Comfort Pro 500 IP, F20, F30, F40, F50, F640, F660, F680, F31IP, L420s, F41 IP, L440