I am able to make and receive calls, but there is no voice
If you are experiencing issues with call quality where either you can't hear the person ringing or visa versa then you will need to ensure the following
If the server operate from a LAN IP or behind a router/firewall, then the router/firewall must have all of the ports listed below opened/forwarded.
Web GUI:
- TCP: 80, 81, 443
SIP traffic:
- TCP: 10001, 5060-5069
- UDP: 4000-4999, 5060-5069, 10000-20000
One these ports have been set, you may need to reboot the router/firewall for them to apply. Likewise, we would suggest rebooting the phones.