We are using a certificate from GoDaddy
Ports: 443, 4443 & 4443 are open (for trusted addresses only.)
Phone says registered, but i cannot place or answer calls.
It rings when i have a incoming call, but it stops ringing when i click answer and nothing happens. Desk phone continues to ring, and caller hears the same.
Never tried a godaddy certificate but the Phone ONLY works when using HTTPS:// and not HTTP:// . Check that apache is using that certificate in system-admin -> https-setup
Try making the UCP/WebRTC ports as open as possible on the firewall then retest, can adjust later. It will let you attempt calls with the wrong permissions but will just kill the audio/connection.