We been using FreePBX for about 8 years now. A couple of months ago I downloaded 17 and successfully got it running.
I was on Facebook trying to help someone with their ver 17 install. This is their post. Basically a fresh install and 2 polycom phones can not call each other, and instead it goes right to voice mail. This is all internal on the same network.
Well, here comes the interesting part. While we have a version 17 fully running in our office, Tonight I installed a new fresh install on a new computer, used the PUB install, and I got the same results. I set up (4) polycom phones. I tried (2) Polycom 501 and (2) Polycom 401.
The Phones could not call each other and went straight to VM. No matter what I changed, they go straight to VM.
So then I downloaded Ver 16 and reinstalled from scratch, on the same computer, phones worked immediately. Seems there may be an issue with the most recent version 17