no ingoing audio (anymore)

[jampy]

I'm using 3CX 18.0.4.965 on a Hetzner Cloud server with a "unsupported" SIP trunk.

My setup worked fine for a few years but I just realized that there is no audio with calls originating externally. When I call external numbers, everything is fine. I can't even tell when the problem started, as most calls are to external numbers.

When a client calls, then it is either sent to a call queue or voicemail. They can't hear the pre-recorded messages, however. Also when I pick up the call we can't hear us. When I call back, everything is fine.

Firewall test completes successfully.

I captured packets, but I'm not sure what to look for, as I'm no SIP expert.

However, I can see lots of RTP G.711 packets flowing back and forth with calls originating externally and also calls to external numbers:


This looks to me as if the firewall is okay?

However, with the call TO an external number (where audio is fine) I additionally see lots of UDP packets in between. Could that be a STUN server? See here:



94.x.x.x is the public IPv4 address of the 3CX host.

195.69.183.2 is the address of the trunk.

What should I look for / try now?

Thanks.

 

[jampy]

Turned out, it was a provider problem (not of my trunk, but the provider responsible for the number itself, which had been set up by my old provider and since then migrated to my current provider/trunk).