[asterisk-users] Outbound calls drop after 15 to 30 seconds.

[Guillaume Yziquel]

Hello.

I've set up and configured an Asterisk server to make SIP phone calls to 
  external classic phones.

However, it happens that after 15 or 30 seconds, the phone call drops. 
The SIP session still seems valid, but no sound comes through any more.

How would you go through to troubleshoot this issue?

All the best,

Guillaume Yziquel.