RJ9 (RJ22) Quick Disconnect Cord for use OvisLink Headset with Avaya, NEC, Nortel, PolyCom SoundPoint IP 335, 450, 560, 650, 670 Quick Disconnect Cord for OvisLink Call Center Headset Compatible with following telephone models: Avaya 1120, 1140, 1165, 1210, 1220, 1230, 1408, 1416, 3904, 3905, 7208, 7316, 9404, 9408, 9504, 9508 IP Deskphone Polycom: SoundPoint IP 335, 450, 550, 650, 670, Microsoft Lync CX200, CX600 Media Business Phone VVX300/310, VVX400/410, VVX500, VVX 600 AASTRA, Allworx, NEC, Nortel, Norstar, Meridian, ShoreTel, Talkswitch phones with RJ9 headset jack