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MGCP and Cisco UCM issues when using different PRI timeslots?

I have an issue in regards to MGCP and Cisco UCM7.

I changed our timeslots from 23 channels (1-24) to 15 channels (1-15,24).  And it works great!

Until the router reboots and Cisco UCM via MGCP overwrites the configuration back to 1-24.

So Cisco UCM is definitly overwritting what is on the voice gateway router.

What can I change in Cisco UCM to NOT do this or that we are using the first 15 channels of the PRI?

Thank you!

4 REPLIES
Cisco Employee

Re: MGCP and Cisco UCM issues when using different PRI timeslots

Remove this from your config:

ccm-manager config server 172.16.240.124
ccm-manager config


BTW, what you're doing is NOT supported

The user is unable to configure fractional or partial T1 PRI with MGCP  and Cisco CallManager

http://www.ciscotaccc.com/kaidara-advisor/voice/showcase?case=K14305072

HTH

java

If this helps, please rate

www.cisco.com/go/pdihelpdesk

HTH

java

if this helps, please rate

www.cisco.com/go/pdi
New Member

Re: MGCP and Cisco UCM issues when using different PRI timeslots

WOW.  Not supported.  That is not a good thing and don't understand why. 

So, if I remove those commands will we ....

1) Still be able to place and recieve calls through that gateway?

2) Still be able place and recieve calls throught that gateway if it is rebooted?

Question #2, is probably my biggest concern.

Thanks for the help!

VIP Super Bronze

Re: MGCP and Cisco UCM issues when using different PRI timeslots

To be more specific, this is not supported with MGCP because UCM does not support fractional T1 circuits. This is entirely possible if you use H.323 or SIP on the gateway instead of MGCP.

Your ability to place or receive calls will depend on the channel selection order and call volume. Either way, when you hit a channel that is not in service the call will likely fail. UCM (which has no idea of the limited timeslots) is controling the Q.931 signaling which includes the timeslot selection.

Cisco Employee

Re: MGCP and Cisco UCM issues when using different PRI timeslots

The link I posted explains how to busy out the channels so you don't hit a nonworking channel. But it clearly explains this won't be supported

For a workaround, use H.323 instead of MGCP if a fractional PRI is necessary.

As an alternative, busy-out the B-Channels that you are not using in Cisco CallManager by performing these steps:

Note: This procedure is not TAC-supported.

If you want TAC support you'll have to switch to H323.

HTH

java

if this helps, please rate

www.cisco.com/go/pdihelpdesk

HTH

java

if this helps, please rate

www.cisco.com/go/pdi
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