I’m trying to connect a Yealink phone from an external location to a FreePBX on our corporate LAN. I have forwarded ports 5060 and 10000-20000 UDP to the internal IP on the firewall (access only from the external static IP) and also entered the RTP ports on the Yealink phone as min/max ports (don’t know if this is necessary, but nothing was working so I figured WTH). I have also added the external IP to the FreePBX firewall. Problem: the phone is not registering.
Heck I even tried opening ports 1-65535 and disabling the onboard firewall, but still the external phone isn’t registering. I’m using a USG Pro firewall in case you’re wondering.
What could I be overlooking?