I have verified that it is not a network issue, the phones are on the right subnet (10.200.0.xx) with DNS settings and everything.
On the PBX server, I can see the incoming message from the phone in sngrep, but the PBX simply never responds.
Turned off intrusion detection (fail2ban), no change. Turned off the firewall, no change. Phone on all my other subnets work just fine. Verified that this subnet is on the local trusted side of things in fail2ban and the firewall. Still nothing.
The phones are yelling into the void it would seem.
Sangoma support seems to be equally baffled.
Anyone seen this before? Any suggestions on what to look for here?
5 posts - 2 participants