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Issue with CUCME and Exchange 2013 Unified Messaging

We have had an issue where we could only reach our Exchange UM server if we pointed the dial-peer directly to the mailbox listening port rather than the call router port.

Exchange 2010 and 2013 should both accept a SIP connection to a CAS running Unified Messaging on either port 5060 or 5061 by default. The CAS which runs the UM call routing service will then send a SIP redirect to CUCME or the SIP phone with the IP and port of the mailbox server.  

This was not working correctly in our installation due to CUCME's max-redirect having a default of 1 for any dial-peer unless the value is changed.  Exchange was sending the redirect correctly but the lack of "max-redirects X" was causing the redirect to fail.  

We set ours to 10, which fixes the issue. We have submitted a question to TAC to explore the ramifications of setting it so high.  Since we were unable to find a solution when searching for a solution, we wanted to post this so that others may not have to spend as much time as us.  It may have been a "rookie mistake" but I'm sure others will make it.

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