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Exchange 2010 and Cisco CUCM

By March 15, 2011September 2nd, 2020Blog, Hot Technology Topics, Unified Communications

Exchange 2010 and Cisco CUCM

We recently migrated our production environment over to Exchange 2010 from Exchange 2007.  During the process we hit one snag that caught us a bit by surprise.  When we were migrating our Unified Messaging Dial Plans from 2007 to 2010, we found that even though we were doing a SIP connection from CUCM to Exchange 2010 that we had to set the Dial Plan to be of the TEL URI type.  One of our voice engineers banged his head against a wall for quite a while trying to figure this out. 

In Exchange 2007, this same setup was done via SIP URI.  In Exchange 2010, the only time SIP URI (to our current knowledge) is supported is when integrating with OCS 2007 (RTM or R2) or Lync 2010.  When using another 3rd party system, we had to go to TEL URI. 

While this turned out to be a simple solution (Occam’s Razor strikes again), it was confusing to us as we thought since we were doing pure SIP that it should be a SIP URI.  Bottom line is, if you are trying to get a 3rd party integrated with Exchange 2010 Unified Messaging and having issues, try switching to TEL URI and see if it solves the issue.

-Adam Ball, PEI

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