Jabra electronic hook switch (EHS) from Jabra wireless hadset enables you to electronically answer and end calls, control volume and mute comments using controls built into your Jabra wireless headset (for example  Jabra Pro 920,  Jabra Pro 9450, Jabra 9470, models), while you are away from your desk phone. Now you can enjoy the benefits of “hands free” communications, without the restraints of phone cords. All quite convenient, when you are 300 feet away from your desk.

Compatible with Siemens IP phones:

OpenStage 40/60/80
OptiPoint 500 Basic/Std/Adv/Eco.
OptiPoint 600
OptiPoint 410/420 Std/Adv

Compatible with Aastra IP Phones:

Aastra IP Phones:
Aastra 51i (require Part#: D0062-0011-34-00 “DHSG CABLE KIT”
Aastra 53i (require Part#: D0062-0011-34-00 “DHSG CABLE KIT”
Aastra 55i (require Part#: D0062-0011-34-00 “DHSG CABLE KIT”

Aastra 57i (require Part#: D0062-0011-34-00 “DHSG CABLE KIT”

Aastra 57i CT (require Part#: D0062-0011-34-00 “DHSG CABLE KIT”

Aastra 6771
Aastra 6773/ip
Aastra 6775/ip
Aastra 5370
Aastra 5370ip
Aastra 7434ip
Aastra 5380
Aastra 5380ip
Aastra 6757i (require Part#: D0062-0011-34-00 “DHSG CABLE KIT”
Aastra 6751i (require Part#: D0062-0011-34-00 “DHSG CABLE KIT”
Aastra 6753i (require Part#: D0062-0011-34-00 “DHSG CABLE KIT”
Aastra 6755i (require Part#: D0062-0011-34-00 “DHSG CABLE KIT”

Aastra 6757i CT (require Part#: D0062-0011-34-00 “DHSG CABLE KIT”

Zultys ZIP Phone

51e, 53e, 53i, 55i, 57i, 57i CT, 59i, 

Mitel IP Phone models:

5370, 5370 IP, 5380, 5380 IP, 6735i, 6737i, 6739i, 6753i, 6755i, 6757i, 6771, 6773, 6773 IP, 6775, 6775 IP, 6865i, 6867i,6869i, 6769i, 6920, 6930, 6940, 7434 IP and 7444 IP

For more information. See GN EHS information and Jabra/GN EHS adapter datasheet