T1-CAS, MGCP and failure of 911 test to see ALI

[s.clinard]

Hi Everyone - I have a Cisco 2811 gateway configured with MGCP to CUCM 7.0.1.21017-1. The location has a 24-channel Digital Access T1 (ds0-group - T1-CAS).

First, I do believe that I am not able to manipulate Caller-ID on a T1-CAS circuit. I have verifed that the Caller-ID received when placing a call out from the site is their published main number (A DID, not BTN). Now, 911 says that it's an AT&T problem. This makes sense as 911 is seeing that same published main number (which is a DID, and NOT a BTN). A call to AT&T's 911 department lead me to believe that AT&T is sending the BTN to the PSAP(s).

I am obviously confused as 911 says they see a DID, AT&T says they are sending the BTN.

Since I cannot seem to use the 3 methods of Calling Party Transform Masks that I know of (on the phone, on the route pattern, and in route list details), has anyone run in to this before or have any suggestions?

This is a new Cisco VoIP install to the site, but not a new T1-CAS circuit.

Thanks for any help!

Shane

[paolo bevilacqua · Accepted solution]

Hi, you cannot do anything about your CLID on a T1 CAS circuit, for the simple reason there is no CLID sent.

As 911 correctly said, that is your SP problem.

[s.clinard]

Thanks for confirming Paolo. I've engaged Telco for problem resolution.

Have a good day :)

Shane