We’re running a v13 Distro (patched to 10.13.66-22). We have POTS and VOIP trunks. If our internet connectivity drops, all telephone connectivity halts and our SIP peers (connected via LAN) also drop. SSH freezes at login and the web GUI also stalls until internet connectivity is restored.
Is it expected behavior that LAN phones drop when only WAN connectivity drops?
There is a known issue with chansip freezing when not being able to perform a DNS lookup due e.g. to your internet being down.
Maybe you are seeing that.
Are you using chansip and are you registering your trunks to a FQDN?