New T400 Headset For Polycom SoundPoint IP Phone Series 430 450 550 670 black | eBay
Polycom Compatible Plantronics VoIP Wireless Headset Bundle with Electronic Remote Answerer (EHS) included | SoundPoint® Phones: IP 335, IP 430, IP 450, IP 550, IP 560, IP 650, IP 670, VVX300, VVX500, VVX310, VVX600, VVX400, VVX1500, VVX410
Plantronics CS520 Wireless Headset Package for Polycom IP Phones
Plantronics APP-51 Electronic Hookswitch Adapter EHS Cable (formerly APP-50) for Polycom and Digium IP