Article ID: 2741296 - View products that this article applies to.
Consider the following scenario:
This issue occurs because the G.722 codec is removed from the Session Description Protocol (SDP) in the INVITE request that is sent when video is introduced to the conference. However, the Audio Video Multipoint Conferencing Unit (AVMCU) does not start to use the renegotiated codec immediately. The AVMCU may take some time to switch from the G.772 codec to the SIREN codec.
To resolve this issue, install the following cumulative update:
(http://support.microsoft.com/kb/2740406/ )Description of the cumulative update for Lync Server 2010, Unified Communications Managed API 3.0 Runtime: October 2012
For more information about how to configure the Call Admission Control feature, go to the following Microsoft website:
How to configure the Call Admission Control featureFor more information about how to plan for the Call Admission Control feature, go to the following Microsoft website:
How to plan for the Call Admission Control feature