[cisco-voip] frustrating FXO disconnect

[Ryan Ratliff]

If you've determined that Unity is initiating the disconnect then get  
the Unity expert brought back in to help determine why.   Are there  
any errors in the Unity logs at the time the call is dropped?

-Ryan

On Jun 8, 2009, at 2:29 PM, Robert Singleton wrote:

I have a 2811 equipped with a 4FXO card in one particular location  
that suffers a symptom that no other location does.

Incoming calls on the gateway work great and can be transferred  
anywhere (ip phones, external gateways, etc) EXCEPT to Unity VM.  
Callers will be disconnected a few seconds into the greeting. Please  
note that the calls are being released and audio is cutting through,  
however, the call will be disconnected after about 10 seconds. This  
problem has existed since the branch was put on net, so I personally  
am pretty sure there is some minor configuration issue, but I have  
not found it.

In working with Cisco TAC, it seems to have been difficult to narrow  
the problem down to the proper technology. Since the word 'voicemail'  
was mentioned, I was connected with a Unity expert. However, only  
this specific location has this problem and only when the call is on  
this particular FXO gateway. In working with a gateway expert, the  
disconnect seems to be coming from Unity. I kanna win.

For political reasons, we are scheduling a complete replacement of  
all the equipment. You know, buying a new car because the old one is  
idling rough. Personally, I'd like to resolve this *before* replacing  
nay hardware because I don't think it's a hardware issue.

Equipment is as follows: 2811 running IOS 12.4(9)T7 with a PVDM2-16,  
a VIC2-4FXO and a WIC-1DSU-T1-V2. FXO ports are loop start,  
configured via MGCP. So far as I can determine, the configuration is  
identical (beyond unique site data such as IP addresses, dhcp pools,  
etc) to any of a dozen or more similar sites that do not suffer this  
symptom.

Any ideas?

Thanks,

Robert

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