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
Poly APN-91 EHS Cable - Headsets Direct
Sennheiser - Headphones & Headsets - Microphones - Business Communications
Jabra Link 14201-40
Amazon.com: Plantronics - Electronic Hook Switch Cable APP-51 (Poly) - Remote Desk Phone Call Control - Works with Poly Desk Phones : Electronics
EHS - Electronic Hook Switch - Snom Service Hub - Snom Service Hub
Yealink ehs guide - IPN Headsets
GRANDSTREAM GXP2140 Enterprise HD Voice IP Telephone, color high reso
Jabra LINK 20 Avaya Electronic Hook Switch (EHS) Adapter
EHS Contact Center Cables/Lifters - Headsets Direct
Using a Headset with EHS / Hook Switch - Mitel : Cadence Technology Services
Wireless Headset EHS Guide
EHS Cable for Avaya Phones with no EU24 Port (APV-63) | Business Telecom Products
Confluence Mobile - Documentation
Jabra Link 14201-44 EHS Adapter - Headsets Direct
Amazon.com: Ehs101 Ehs Wireless Headset Adapter : Home & Kitchen
Yealink IP Phone SIP-T42S 6-UNITS Dual-port Gigabit Ethernet PoE support
EHS Cable for Aastra, Mitel, Siemens, Funkwerk & Unify (APS-11) | Business Telecom Products
Amazon.com : Axtel AX-400G IP Phone - 8 SIP Accounts, 5-Way Audio Conference Bridge, Dual-Port PoE Gigabit Ethernet, Illuminated 2.8" 320×240 Pixel Color Display, Crystal Clear HD Sound, EHS Capable - Black :
Jabra Link 35 EHS Cable Adapter - Avaya
Fanvil EHS headset adapter for JABRA (Jabra PRO 920, PRO 9450, PRO 94
Sennheiser - Headphones & Headsets - Microphones - Business Communications