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You have a process that listens toa Transport Layer Security (TLS) connection by using a managed Session Initiation Protocol (SIP) stack in Microsoft Office Communications Server 2007 R2. However, the TLS connection stops unexpectedly during the TLS negotiation stage.
This problem occurs if third-party TLS implementations send empty TLS packets. In this case, the managed SIP stack process these empty packets incorrectly.
To resolve this issue, apply the following update: For more information, click the following article number to view the article in the Microsoft Knowledge Base:
970679 Description of the update package for Office Communications Server 2007 R2, Unified Communications Managed API 2.0 Core Redist 64-bit: July 2009