The Audio/Video Conferencing Server SIP listening server has failed. The Audio/Video Conferencing Server may not be able ...

The Audio/Video Conferencing Server SIP listening server has failed. The Audio/Video Conferencing Server may not be able to accept new incoming SIP requests.

Exception: %1
Cause: Audio/Video Conferencing Server cannot accept incoming SIP connections.
Resolution:
Check that network connectivity exists. If connectivity exists and SIP connectivity is not reestablished automatically restart Microsoft Lync Server 2010 Audio/Video Conferencing Server. The Microsoft Lync Server 2010 Audio/Video Conferencing Server should be restarted.