Can you post the config of your: 1) incoming dial peer pots 2) outgoing dial peer voip 3) config of your voice port where the phone is connected? 4) any other relevant config for this call like translation rules etc?

There is something wrong going on with the SRST testing.   almost all events i see the phone sending the REGISTER message with expires value as 0. This will make the SRST router not register the phone. as soon as the REGISTER message arrives from the...

collect :debug ccsip verboseand the "show tech voice" of the routerpacket captures you can run a monitor session on the switch port where the phones are connected.

if you look at your REGISTER messages closely, you will see that they have expires value as 0. If this was a legit REGISTER request from a phone who is actually trying to register with SRST, i would see expires value as 3600.Value 0 means that it is ...

just to understand correctly, when you call from an internal phone to another phone and forward the call to the pstn, the call works. however when someone from pstn network calls your internal phone and then you forward all to another pstn number the...