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New Member

911 calls drop automatically

I have a customer that uses the 911 service fairly often and when they are on the line for more than a 4-6 minutes, the calls terminate unexpectedly. The customer is using CM 3.3 with an MGCP controlled CAS T1 in the gateway. Any troubleshooting tips would be appreciated.


Re: 911 calls drop automatically

Only 911 calls via this circuit?

Can we get from GW

debug mgcp packet

debug vpm signal

From CUCM side:

SDI and SDL traces

Calling, called and timestamps.


New Member

Re: 911 calls drop automatically

I will post the debugs and the CCM trace. Phone number in question is 36098, call was made to 911, start time is 9:58 at approx. 40 - 50 seconds. MAC Address of phone is SEP001121B52CDD. The timing between call amanger and the gateway are off by 1 minute 37 seconds. First I saw and we will definitely fix. But for log purposes, it's a nightmare on this. Was unable to pull SDL trace. Went too late to retrieve. Sorry, about the size of the log. Thanks for your help.