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New Member

Call Forward unregistred Problem with MGCP and CUCM 6.1(2)


i have a CUCM 6.1(2) with one 2811 router.

In this router (IOS c2800nm-ipvoice-mz.124-22.T5.bin) there are 2 PRI, 2 BRI configured with MGCP (one for PSTN and one for communicate with one PBX).

In general all works fine, but there is a problem: when i call one IP Phone through one of the two PRI or BRI (external call through direct number or call from PBX), if this Phone is unregistred, the Call Forward Unregistred doesn't work, but if i call this phone from another IP Phone it works.

It isn't a problem of CSS because if i put the same CSS in Call Forward All and i try to put the same call (through PRI or BRI) it works.

It seems like that the CUCM can't communicate the correct indication for Call Forward Unregistred through MGCP, and i hear fast busy. I have the same scenario with CUCM 7.0 and it works fine.

I've already change the IOS of the router without good news and i wouldn't upgrade the CUCM for the moment.

Here is the q931 output for CFU

001503: *May 22 10:45:21: ISDN Se0/0/0:15 Q931: TX -> CALL_PROC pd = 8  callref = 0x803A
        Channel ID i = 0xA98385
                Exclusive, Channel 5
001504: *May 22 10:45:21: ISDN Se0/0/0:15 Q931: TX -> FACILITY pd = 8  callref = 0x803A
        Facility i = 0x91AA06800100820100A40702020BD5800100
001505: *May 22 10:45:21: ISDN Se0/0/0:15 Q931: TX -> DISCONNECT pd = 8  callref = 0x803A
        Cause i = 0x81A9 - Temporary failure

Any ideas?

Thanks a lot.

Cisco Employee

Re: Call Forward unregistred Problem with MGCP and CUCM 6.1(2)


Could you please provide the following for a test call:

++     calling party number

++     called party number

++     Where do you want the call to go if the ip phone is unregistered? Voicemail or another extension?

++     detailed CUCM SDI traces from all servers in the cluster.

++     debug mgcp packets and debug isdn q931

++     show tech from the gateway in question.



-- Regards, Harmit.
New Member

Re: Call Forward unregistred Problem with MGCP and CUCM 6.1(2)

Thanks for replay and sorry for the delay.

I had first open a TAC case, but because i was hurry i ' ve done an upgrade to release and the problem was solved.

It seems like a bug of version 6.1(2) of CUCM with MGCP.

i hope this can be helpfull.