[cisco-voip] what to debug when calls disconnect "normally"?

[Ryan Ratliff]

What leads you to believe the router is initiating the disconnect and  
not the provider?  On a q931 debug if you see an inbound disconnect  
then it is the provider dropping the call.  If the router is sending  
it outbound then the voip leg (to the phone) has disconnected the  
call in which case I'd look at a potential hookswitch issue.

If it is an inbound disconnect the best thing to do is call back the  
person that just dropped and ask them what happened.

-Ryan

On Sep 16, 2008, at 3:46 AM, Kelemen Zoltan wrote:

We have a client with CCME 4.3, 7940 and 7911 phones, and ISDN PRI  
complaining about some calls being dropped prematurely (they claim  
only calls to a certain, third party provider, not the one giving  
them the ISDN line).

However, debugging isdn q931 shows only Cause code 0x8090, "normal  
call clearing" for all the calls they've mentioned as prematurely  
disconnected.

While I tend to believe it's a problem on their provider's side, it  
still disturbing, that the router is the one initiating the  
disconnect, not the provider. The calls can last anywhere from 0 to  
20 seconds, but always disconnect normally.

Any idea, what to debug now, to find out more?

thanks,
  Zoltan
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