We have purchased some Sangoma phones with an eye to using them in conjunction with OpenVPN as a way to get around various ISPs that seem to block SIP, or at least make it a pain to get configured (Looking at you, Comcast!).
Anyhow, the default “Server Range” for OpenVPN is 10.8.0.0/24, and this conflicts with one of our remote office’s subnets, so we changed it to 10.80.0.0/24. No big deal. VPN is established, proper addresses are given out, and everything seems great, but the phones won’t register.
A little more digging revealed that Endpoint Manager is still setting the “SIP Destination Address” to “10.8.0.1:5060”, even after we have rebuilt the phone configs. We can work around this by editing the template, but it seems that Endpoint Manager ought to see the new Server Range and update the address in the provisioning files. Are we doing something wrong, or is Endpoint Manager not picking up on the change we have made?