Article ID: 968883 - View products that this article applies to.
The managed SIP stack stops accepting connections. Therefore, the Call Control Server does not accept any new calls in Microsoft Office Communications Server 2007 R2.
To resolve this problem, apply the update package for Microsoft Office Communications Server 2007 R2, Unified Communications Manager API 2.0 Core Redist 64-bit that is dated April 2009. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/967674/ )Description of the update package for Communications Server 2007 R2, Unified Communications Manager API 2.0 Core Redist 64-bit: April 2009
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/824684/ )Description of the standard terminology that is used to describe Microsoft software updates