No sound when I call external phone number.

[Casta]

Hello everybody,

After my problem of conference, I have a other problem. One per week.

So: When I call an external phone number, for example a GSM, the GSM rings but I heard anything on my IP phone:
When I take down, I heard the tonality. I enter my external phone number (GSM), the GSM rings but I don’t heard the ring on my IP Phone. I answer on the GSM, there’s no sound on the IP Phone and on the GSM.

However when I call an intern phone number, there’s any problem.

I don’t change gateway, server or pattern configuration.

Thanks for your help

 

[munsonbrown]

Check gateway of GSM device if its on a different subnet from the phone making the call. Also check codec values for the two endpoints