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
DHS14 EHS Cable For Adapt 30 – Discover Headsets
Amazon.com: Plantronics - Electronic Hook Switch Cable APP-51 (Poly) - Remote Desk Phone Call Control - Works with Poly Desk Phones : Electronics
Jabra Link 14201-40
Jabra Link 14201-44 EHS Adapter - Headsets Direct
Using a Daisy Chain to Activate My Phone | Nextiva Support
Using a Headset with EHS / Hook Switch - Mitel : Cadence Technology Services
EHS Cable for Avaya Phones with no EU24 Port (APV-63) | Business Telecom Products
Poly APN-91 EHS Cable - Headsets Direct
Jabra Link 14201-32 EHS Cable Adapter - Avaya/Nortel
Jabra LINK 20 Avaya Electronic Hook Switch (EHS) Adapter
EHS - Electronic Hook Switch - Snom Service Hub - Snom Service Hub
Fanvil EHS headset adapter for JABRA (Jabra PRO 920, PRO 9450, PRO 94
VT EHS80 Adapter for PC & Yealink, Snom, Poly USB Phones and VT, Jabr
Yealink IPPhone SIP-T42S 4-UNITS Dual-port Gigabit Ethernet PoE support
Poly APN-91 EHS Cable - Headsets Direct
Jabra Link 35 EHS Cable Adapter - Avaya
GRANDSTREAM GXP2140 Enterprise HD Voice IP Telephone, color high reso
Using a Headset with EHS / Hook Switch - Mitel : Cadence Technology Services