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2851 MGCP PRI Gateway locking up

We have a 2851 MGCP PRI gateway connected to CallManager 4.1.3. About once a day, outbound calls will stop routing and we have to do a "no mgcp" and "mgcp" to get the PRI back up. We have changed IOS to see if it is possible bug. I really don't want to call TAC and thought I would see if anyone has seen this?


Re: 2851 MGCP PRI Gateway locking up

Can you paste a sh version ?

Community Member

Re: 2851 MGCP PRI Gateway locking up

Here is the show ver from the router:

Cisco IOS Software, 2800 Software (C2800NM-SPSERVICESK9-M), Version 12.4(3b), RELEASE SOFTWARE (fc3)

Technical Support:

Copyright (c) 1986-2005 by Cisco Systems, Inc.

Compiled Fri 09-Dec-05 10:53 by alnguyen

ROM: System Bootstrap, Version 12.3(8r)T7, RELEASE SOFTWARE (fc1)

dhigw2 uptime is 1 day, 18 hours, 1 minute

System returned to ROM by reload at 21:14:11 UTC Wed Jan 11 2006

System image file is "flash:c2800nm-spservicesk9-mz.124-3b.bin"

This product contains cryptographic features and is subject to United

States and local country laws governing import, export, transfer and

use. Delivery of Cisco cryptographic products does not imply

third-party authority to import, export, distribute or use encryption.

Importers, exporters, distributors and users are responsible for

compliance with U.S. and local country laws. By using this product you

agree to comply with applicable laws and regulations. If you are unable

to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:

If you require further assistance please contact us by sending email to

Cisco 2851 (revision 53.51) with 249856K/12288K bytes of memory.

Processor board ID FTX0949C1FT

2 Gigabit Ethernet interfaces

72 Serial interfaces

6 Channelized T1/PRI ports

4 Voice FXO interfaces

DRAM configuration is 64 bits wide with parity enabled.

239K bytes of non-volatile configuration memory.

62720K bytes of ATA CompactFlash (Read/Write)

Configuration register is 0x2102

Re: 2851 MGCP PRI Gateway locking up

When it fails, does CCM show the gateway endpoints registered or not, and what does router say (show ccm-man) ?

Have you looked at the router log?

I have seen several voice/MGCP bugs in 12.4 code and later 12.3(14)T, so I tend to stray from using 12.4 at moment unless needed but a 2851 is one model where you need newer IOS versions.

I would do this when it fails, get the above info plus...

capture 'show isdn stat' , 'show ccm-man',

Do a 'debug isdn q931' and 'debug mgcp packet' and place some calls that fail, hopefully those captures will be point to problem. Also have CCM detailed traces turned on the call manager server so you can compare the router debug to CCM trace.

What do the router config look like for ccm-manager commands and global mgcp commands?

Are you binding the MGCP traffic to a interface or just taking default one it uses? I see theres 2 gig interfaces, There's a mgcp bind bug to fixed in 12.4(5).

If you have a syslog server, it may worthwhile running the 'debug mgcp packet' to a syslog server constantly until the problem happens with CCM detailed traces running on server. Disable console/monitor logging and buffered if you want.

Community Member

Re: 2851 MGCP PRI Gateway locking up

Am watching this with interest. We have 2851 and have tried different IOS versions. Our PRI is attached via H.323 and no problems. An 8-port FXS/DID for faxes uses MGCP and randomly freezes (every 1-3 days). This is the first posting I've seen that may be associated with our problem.

Community Member

Re: 2851 MGCP PRI Gateway locking up


I called TAC for this problem. After a few days they told me that "you may be hitting this issue:CSCej50165".

I made upgrade to IOS version 12.4.5a and now it seems to be ok.

I hope this help you.



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