Plantronics APP-51 Electronic Hookswitch Adapter EHS Cable (formerly APP-50) for Polycom and Digium IP
Poly Savi 7310 Wireless Office Headset System
Plantronics CS520 Spare Headset - 86920-01 - Headsets Direct
Amazon.com: Polycom Compatible Plantronics VoIP Wireless Headset Bundle with EHS, SoundPoint IP 335, IP 430, IP 450, IP 550, IP 560, IP 650, IP 670, VVX300, VVX500, VVX310, VVX600, VVX400, VVX1500, VV : Office Products