The Plantronics 2.5mm-to-QD Adapter Cable has a special 2.5mm 4-conductor adapter with 3 black bands (rather than the normal 2 black bands found on cell phone headsets). The other end of the cord has QuickDisconnect to any Plantronics Call Center headset (H-series).
|Connector on First End||1 x Quick Disconnect|
|Connector on Second End||1 x Sub-mini phone Male|
|Compatibility||Plantronics Headsets: H91-CIS
Cisco Wireless IP Phone: 7920
Cisco Aironet Access Point: 1200 series