Amazon.com: Call Center QD to 2.5mm Plug Adapter Cable for Cisco SPA Series or Polycom Phones with 2.5mm Headset Jack Quick Disconnect (QD) to 2.5 MM Jack Cord 1005143 : Electronics
Plantronics Adapter Cable (QuickDisconnect - 2.5mm) for Polycom IP 320, 321, 330, 331, Panasonic, AT&T, RCA,
Polycom Compatible Sennheiser D10 Wireless Headset with Polycom EHS included | SoundPoint Phones: IP 335, IP 430, IP 450, IP 550, IP 560, IP 650, IP 670, VVX 101, VVX 201, VVX300, VVX310, VVX400, VVX410, VVX500, VVX600, VVX1500
PC Headset Adapter for Polycom SoundPoint IP Phone
Amazon.com: Original - PC Headset Adapter for Polycom Phones : Office Products
Corded Phone Headset for Corded Home Telephones Office IP VoIP Analog Phones Aastra Avaya Digium Mitel Nortel NEC Polycom ShoreTel Toshiba Phones (Headset Adapter Included) - Newegg.com
Polycom Headset Compatibility Guide: Everything You Need To Know – Headset Advisor
Headset Interface Adapter - Lets you easily place an audio-only call with SoundStructure installed audio solutions. | Poly, formerly Plantronics & Polycom
RJ9 Splitter Telephone Training Adapter Y Splitter For Headset or Handset for Nortel Meridican, Norstar, Avaya, Ashtra, Mitel, Polycom, Ge and Other IP Phone - Walmart.com