We have a FreePBX setup 184.108.40.206 with commercial EPM, most phones are polycom VVX410 with firmware 1.09. EPM is at 220.127.116.11
Decided to connect a Plantronics CS540 headset to one phone using the APP-51 EHS adapter, like I have on other hosted systems but no matter what settings I use I cannot change the phone Hookswitch mode to Plantronics EHS. If i select it, the phone reboots and then comes back at the default EHS mode.
It seems to be a limitation in freepbx, as like I said I have other systems using the exact phones, cables, headset.
Any help would be much appreciated.