This Poly (Plantronics) Adapter Cord is an extension cable for RJ9 type connection. Use 85638-01 as an extension cable for Cisco setups when using Plantronics wireless headsets on a Cisco phone with a sidecar. It extends the reach of the cable without altering the pin-out configuration.
Poly Headset Adapter Cord for Cisco
Part Number: 85638-01