We have a client that we just moved their system offsite into the cloud (well, really our cloud) and they were having CONSTANT phones dropping off - PJSIP mostly remedied that (they stopped becoming unreachable) but when you would call in and hit a ring group, some of the phones in the ring group would not ring - it was driving me crazy - we tried adjusting things like qualifyfrequency, played with the firewalls, and even switched out some phones (they had some REALLY old Polycom’s) and nothing helped - just switched them to TCP and the problem has COMPLETELY disappeared! I am surprised to say the least - has anyone else seen this? Had bad experiences with using all TCP?
I think it’s a miracle, but probably only because I have been fighting this for days.
Anybody have any horror stories about using TCP instead of UDP?