Cisco Call Manager and Exchange 2010 Unified Messaging–Fast Busy Signal When Calling Voicemail

Exchange 2010, Unified Messaging

 

In this article I spoke about how to configure the Exchange 2010 side of Unified Messaging with Cisco Call Manager:

http://port25.wordpress.com/2012/07/18/cisco-call-manager-and-exchange-2010-unified-messaging/

I wanted to point out this issue in a separate article because it seems a decent amount of people are having the same issue.

After we configured Exchange 2010 UM with Cisco Call Manager, we got a fast busy signal when calling the users voicemail.  After turning up diagnostic logging on all of the Exchange UM servers, we would see the SIP connection hit:

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But the user would get a fast busy, and we saw event ID 1006 in the event log, which stated The Unified Messaging server has ended a call with ID … because the user at the far end disconnected

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We checked the trunk between Exchange and CCM, and it was set to the G.711 codec (as Exchange doesn’t support G.729).

After some digging inside the call manager, I changed this setting inside Cisco Call Manager:

System->Service Paramters

Select one of your call manager servers, and select the serviceCisco CallManager (Active):

Change the Default Interregion Max Audio Bit Rate from the default setting of 8 kbps (G.729) to 64 kbps (G.722, G.711).

BEFORE:

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AFTER:

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After this change, everything worked!

Enjoy. 

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