CUCM - Steps to upgrade from Exchange 2010 to Exchange 2013 UM

[eastbarnet]

We currently using CUCM 9.1 and Exchange 2010 UM. We have plans to upgrade to Exchange 2013. As part of that process I have installed Exchange 2013 and migrated a test mailbox to the new server. Voicemail no longer works for that mailbox, and the mailbox user cannot dial into his mailbox.

This is not surprising as I have yet to make any configuration changes to the CUCM. I understand, more or less, what I need to do to get communications flowing to the new Mailbox/CAS server, thanks to a very helpful post on this forum (https://supportforums.cisco.com/discussion/11914031/exchange-2013-um-and-cucm-86), but I'm nervous about breaking a working system and am sketchy about how the steps are achieved in practice.

I understand that I need to end up with at least two new SIP trunks, but what about the existing one that currently talks to an Exchange 2010 server that runs (only) the UM role? Do I reuse this trunk, pointing it at the new CAS server? Having first added the trunks for port 8052 etc?

Our current environment is a single Exchange 2010 server running all roles except UM (and Edge), and another 2010 server with UM. We've added a single on-premises Exchange 2013 server with a view to shutting down Exchange 2010 and moving to hybrid.

SIP uses TCP.

[Brandon Buffin · Accepted solution]

I would recommend leaving the existing trunk/voicemail profile in place and setting up the necessary SIP trunk(s) and new voicemail profile to get the test box working on the new 2013 server. You can then incrementally move mailboxes to 2013 and change the voicemail profile for the users as they are moved. See the link below for integration steps.

http://blogs.technet.com/b/canitpro/archive/2014/04/30/step-by-step-integration-between-exchange-2013-um-and-cisco-unified-communication-manager.aspx

Brandon

[eastbarnet]

Brandon,

Thank you for your help. I've worked here for five years and been in charge for two, but we've never got our heads round the phone system. It's very complicated but very reliable, so we simply don't normally attempt non-routine tasks. It hadn't occurred to me to migrate users by assigning a new VM profile, so thank you for that.

[Brandon Buffin]

No problem. Glad to help.