Hello, I've recently set up our shorewall based firewall to use our GrandStream voip phones connecting to sipgate.de. I'm experiencing some problems as after some time (2-3 hours) the phones are still registered but when calling so. I can't hear them (but the other side can hear me).
I tried different settings by checking the port forwardings, disabling STUN and NAT on the device itself. I can't tell if it works now (as I can hear the other side now) but will stop working again in a couple of hours. Traffic logs with tshark show no errors, except this: 450.767075 192.168.10.253 -> 192.168.10.160 ICMP Destination unreachable (Port unreachable) - and it's there almost each second. As you can see from the dump attached access between my fw (10.253) and 10.160 is wide open. 10.160 is my voip phone. Any ideas what this is about or should I ignore this message? Best, Sebastian
dump.tar.gz
Description: GNU Zip compressed data
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