[cisco-voip] SIP between CUCM clusters

[Ryan Ratliff]

You can use SIP trunks between CUCM clusters in lieu of ICTs.   The 8.x SRND specifically states that QSIG-tunneled SIP trunks have feature parity with H.323 ICTs.
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/8x/trunks.html#wp1122456

> The SIP trunk features available in the current release of Unified CM make SIP the preferred choice for new and existing trunk connections. The QSIG over SIP feature provides parity with H.323 intercluster trunks and can also be used to provide QSIG over SIP trunk connections to Cisco IOS gateways (and on to QSIG-based TDM PBXs). The ability to run on all Unified CM nodes and to handle up to 16 destination IP addresses improves outbound call distribution from Unified CM clusters and reduces the number of SIP trunks required between clusters and devices. SIP OPTIONS ping provides dynamic reachability detection for SIP trunk destinations, rather than per-call reachability determination. SIP Early Offer support for voice and video calls (insert MTP if needed) can reduce or eliminate the need to use MTPs and allows voice, video, and encrypted calls to be made over SIP Early Offer trunks.

In general anything you can do to reduce the complexity of your call flows makes your life that much easier both in configuration and troubleshooting.  

-Ryan

On Jun 5, 2013, at 8:32 AM, Carlo Calabrese <carlo_calabrese2006 at yahoo.com> wrote:

This is the problem I am having. Intercluster turnks are H323 based not sip. I have them built now, but it breaks all sorts of stuff.
multicast, not building rtp streams correctly. Dropped calls DTMF.
 
From: Kenneth Hayes [mailto:kennethwhayes at gmail.com] 
Sent: Wednesday, June 05, 2013 3:26 AM
To: Carlo Calabrese
Subject: Re: [cisco-voip] SIP between CUCM clusters
 
That would be call a Intercluster trunk. Build it like you would a regular SIP trunk but instead of selecting SIP trunk go to Trunk->Add New->Trunk type should be InterCluster Trunk Non-Gatekeeper Controlled" put in the required information and I'm not sure if MTP is needed or not it's been awhile since I've done a ICT but that should get you going. Also you will have to make sure you have the correct PT's and CSS on both ends and dial-plan modifications.
 

On Wed, Jun 5, 2013 at 12:19 AM, Carlo Calabrese <carlo_calabrese2006 at yahoo.com> wrote:
Has anyone done a sip trunk between CUCM clusters? I am running 8.6 in production and 8.0 in the lab.
I can make it work with intercluster trunks ok. But I keep running into odd bugs with calls going from sip to h323 back to sip
Or can you point me in the right direction.
 
Thanks.
 

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