[cisco-voip] SIP between CUCM clusters

[Russell Chaseling]

Thank very much Carlo....think I'll try the SIP trunk and see how I go. I'll reply to this and let all know whether the CUEAC BLF works between clusters as expected


From: Carlo Calabrese [mailto:carlo_calabrese2006 at yahoo.com]
Sent: 12 July 2013 19:43
To: Russell Chaseling; 'Erick Wellnitz'
Cc: 'Ryan Ratliff'; 'Cisco-voip'
Subject: RE: [cisco-voip] SIP between CUCM clusters

I only noticed it for endpoints. Don't think we had any problems with gateways.
For  PSTN I have as SIP. ICT which are H323 based and I have several MGCP QSIG trunks
So my path is
PSTN -> SIP -> CUCM -> ICT -> CUCM -> QSIG -> PBX
I haven't had a problem with the QSIG gateway only phones when one is a SIP and the other is SCCP.
When we started having problems, most of the complaints were about dropped calls or not hearing the other end. Found that the call would connect but the RTP path would not get built.


From: Russell Chaseling [mailto:rchaseling at plannet21.ie]
Sent: Friday, July 12, 2013 9:33 AM
To: Carlo Calabrese; 'Erick Wellnitz'
Cc: 'Ryan Ratliff'; 'Cisco-voip'
Subject: RE: [cisco-voip] SIP between CUCM clusters

Excellent tips. Thanks guys

When you say SIP to H323 back to SIP are you talking about endpoints? My other concern is that one of these CUCM clusters already has a H323 ICT to a 3rd 8.X cluster. Calls need to be able to traverse through all of them but presence only shared between the 1st two and there are MGCP QSIG and H323 ISDN gateways hanging off all of them - I suspect I will run into more problems that will out way any possible benefits like presence sharing.



for the simple reason that I believe that presence status can be shared between the two ie IP Phone BLF and CUEAC BLF (particularly CUEAC BLF)


1)      First questions is have I heard this right? Will BLF work between 2 x CUCM clusters?

2)      Has anyone deployed SIP trunks between clusters in production? If so is it worth the pain?

Cheers
Russell


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