Can’t call UM – Event ID 44022


Unable to call UM


Every time a call is made to the UM server the following error is logged on the Lync server front end:-
Log Name:      Lync Server
Source:        LS Exchange Unified Messaging Routing
Date:          10/12/2013 09:27:05 PM
Event ID:      44022
Task Category: (1040)
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      lyncFE.lynclab.local
An attempt to route to an Exchange UM server failed.
The attempt failed with response code 504: exchum.lynclab.local.
Request Target: [], Call Id: [9f9a3df33d2544a9a22ff2c17feedcb5].
Failure occurrences: 4, since 10/12/2013 08:36:55 PM.
Cause: An attempt to route to an Exchange UM server failed because the UM server was unable to process the request or did not respond within the allotted time.
Check this server is correctly configured to point to the appropriate Exchange UM server. Also check whether the Exchange UM server is up and whether it in turn is also properly configured.”


Make sure the dialplan is configured to use TLS (and not TCP). 

About Paul B

My name is Paul Bloem and I am employed at Lexel Systems in New Zealand as a Principal Consultant for Unified Communications. I have been working on enterprise voice solutions for over 20 years. My first 10 years were spent working for a Telco in South Africa (Telcom SA). This is where all the groundwork happened as I was exposed to just about every aspect of telecommunication you could imagine. I develop an interest in PBX technologies and eventually became the go-to guy. Next, I had a 10 year run at Siemens South Africa, most of my time there was as a Technical Trainer. During this time VoIP hit the world stage, I had the privilege of introducing VoIP both as H.323 and later SIP across the Siemens HiPath 4000 solution stack. In 2008 I immigrated to New Zealand with my newly attained MCSE, I was ready to go where no PBX Techie had gone before. I was employed to explore OCS 2007 and that was pretty much the beginning of the end for me. I have been working on OCS and Lync ever since. My current role focuses exclusively on Lync and associated technologies.. That includes pre-sales, consulting, architecture and design, training and support. I even get to play in the development space from time to time - focus on play ;-) I was nominated as a Microsoft VTSP for Lync early in 2013 and also awarded Microsoft's MVP award for Lync in 2014.
This entry was posted in Event ID 44022, Exchange UM 2010, UM. Bookmark the permalink.

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