Article ID: 2703323 - View products that this article applies to.
Consider the following scenario:
Sorry I can't seem to connect you to your meeting right now. Try your call again later. Goodbye.
This issue occurs because a race condition causes Lync Server 2010 Front-end server to respond with an invalid variable to a request from Lync Server 2010 Conferencing Attendant. Therefore, the Lync 2010 Conferencing Attendant cannot transfer the call to the conference.
To resolve this issue, install the following cumulative updates:
(https://support.microsoft.com/kb/2701655/ )Description of the cumulative update for Lync Server 2010, Unified Communications Managed API 3.0 Runtime: June 2012
(https://support.microsoft.com/kb/2701659/ )Description of the cumulative update for Lync Server 2010, Conferencing Attendant: June 2012
To work around this issue, restart the Lync Server 2010 Conferencing Attendant service.
For more information about dial-in conferencing in Lync Server 2010, go to the following Microsoft website:
General information about dial-in conferencing in Lync Server 2010
Article ID: 2703323 - Last Review: September 3, 2013 - Revision: 4.0