Interface: 3.5mm TRRS (Female) rj-9 4P4C (Male). Use PC Headset with most VOIP phones that have a RJ9 headset jack (Not for RJ11). Adapter cable with 3.5mm Headset jack to RJ9 Desk Phones Jack forCisco and more.
5M METRE 4P4C RJ9 RJ10 RJ22 MALE TO MALE TELEPHONE HANDSET CROSS-OVER CABLE
RJ9 RJ10 RJ22 4P4C Coiled Handset Telephone Cable Male to Male 2m
4P4C RJ Crimp Plug Connector - Pack of 10 - Small Telephone 4 pin RJ9/RJ10/RJ22
4P4C RJ Crimp Plug Connector - Pack of 50 - Small Telephone 4 pin RJ9/RJ10/RJ22
4P4C RJ Crimp Plug Connector - Pack of 100 - Small Telephone 4 pin RJ9/RJ10/RJ22
Telephone Handset Cable RJ10 to RJ10 (4P4C) Coiled Curly Lead Cord Wire BLACK
