Plantronics Headset Extension Cable for APD-80 EHS Cable
EHS Adapter
Converter Adapter | Converts RJ-9 to 2.5mm for phones that have a 2.5mm jack., (2200-11095-002) | Use with APP-50, APP-51 EHS for Polycom, Connecting telephone devices to 2.5mm headset mini jack
Yealink EHS (EHS 36) Breakdown and Setup*
Shoretel ehs guide - IPN Headsets
HTEK EHS30 QUICK REFERENCE Pdf Download | ManualsLib