Our company switched to 3CX from another phone system late last year. We've discovered that since that time, our Polycom Soundstation Duo conference room phones will not properly handle incoming calls. Other phones (3CX softphone, Yealink desk phones) work perfectly fine, this seems to be something specific to the Polycom phones. When an incoming call comes in, the call shows up, but pressing either the "answer" softkey or the "on hook" button do not answer the call; the ringing stops but a connection is not made. Hitting the decline softkey disconnects it on the Polycom side, and on the callers end, it goes to voicemail (after another 10-30 seconds) If a call comes in and nothing is done on the Polycom, and the caller disconnects (hangs up) it continues to ring on the Polycom until someone rejects the call (or answers, at which point it does the above) Outgoing calls are not affected. Any input would be appreciated. I've checked the settings on the Polycom against other phones. There is no difference between the settings of the Polycoms or the desk phones. I've checked the VOIP services settings between the old sub-account and the 3cx one. No difference. I've attempted multiple settings changed on 3CX (specifically under the "other" tab, compatibility checkboxes). Nothing doing.