CP965 doest recognite its own microphone

Yealink support said that these models (CP965) had a flaw where randomly the audio would just stop working. No sound. No microphone. You might want to talk with Yealink support.

I'm having the same issue and going nowhere fast.

Might want to try reading through this other community thread below for some suggestions.  All in all, support for the CP965 from Yealink is flakey.  On my CP965 I could not change the volume of the microphone so that I could test it.  I ended up running the controller from the Zoom room management feature on the Zoom admin portal and I was able to change the volume and run a test of the mic and hear myself on playback.  For now, it has been working for a couple of weeks, but when the conference room is quiet, you can hear what sounds like alien chatter coming from the CP965 speakers. Strangest thing, but I am not going to mess with it.  

https://community.zoom.com/t5/Zoom-Rooms-and-Workspaces/Trying-to-set-up-Yealink-CP965-as-a-Zoom-Room-Controller/m-p/96113?search-action-id=61972610277&search-result-uid=96113