Article ID: 2716467 - View products that this article applies to.
Consider the following scenario:
This issue occurs because the apostrophe in user A's SIP address causes the information that contains user B's uniform resource identifier (URI) to be truncated. Therefore, the information that Lync 2010 uses to connect user B to the meeting is incomplete.
To resolve this issue, install the following cumulative update:
(http://support.microsoft.com/kb/2708616 / )Description of the cumulative update for Lync Server 2010, Web Conferencing Server: June 2012