Article ID: 2512216 - View products that this article applies to.
You deploy the Response Group Service (RGS) in a Microsoft Office Communications Server 2007 R2 environment. Occasionally, RGS agents cannot receive calls until you restart the RGS on all front-end servers. Additionally, the following event is logged on the server that is running the RGS:
Log Name: Office Communications Server
This issue occurs because Unified Communications Managed API (UCMA) cannot update the presence subscription for all agents after one of the front-end servers is restarted. RGS agents cannot receive calls without the presence status.
To resolve this issue, install the following cumulative update:
(https://support.microsoft.com/kb/2501720/ )Description of the cumulative update for Office Communications Server 2007 R2, Unified Communications Managed API 2.0 Core Redist 64-bit: March, 2011
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Article ID: 2512216 - Last Review: March 10, 2011 - Revision: 1.0