Cisco Cisco TelePresence Video Communication Server Expressway
Appendix 5 – Known interoperating limitations
Cisco VCS Deployment Guide: Microsoft OCS 2007 R2, Lync 2010 and Cisco VCS X7.1
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Use of VCS clusters with Lync without B2BUA FindMe registration therefore provides resilience, not
extra capacity / load balancing.
extra capacity / load balancing.
Lync clients may lose or fail to receive video if B2BUA
is not used
is not used
Lync clients require a full video frame to be received before they display a video image. A full frame is
sent either when requested by a fast picture update request, or when the video stream is paused and
then re-started. Lync, however, does not request fast picture updates.
sent either when requested by a fast picture update request, or when the video stream is paused and
then re-started. Lync, however, does not request fast picture updates.
A work around has been implemented for MOC/Lync clients where endpoints and the VCS
interworking function perform fast picture update requests on behalf of the MOC/Lync – but this is not
available for Lync clients; use the VCS B2BUA to work around this; B2BUA performs the Fast Picture
Update requests on behalf of MOC/Lync clients.
interworking function perform fast picture update requests on behalf of the MOC/Lync – but this is not
available for Lync clients; use the VCS B2BUA to work around this; B2BUA performs the Fast Picture
Update requests on behalf of MOC/Lync clients.
MOC/Lync client reports no audio device
MOC/Lync client sometimes complains that it has no audio device configured when selecting resume
… follow MOC/Lync client’s instructions to update the audio device and resume will then work.
… follow MOC/Lync client’s instructions to update the audio device and resume will then work.
Microsoft Server
OCS
In Microsoft Server 2008 R2 the TLS configuration has changed. This has been seen to cause
problems with Cisco VCS connecting to OCS over TLS, and also cause problems for OCS
components to talk to one another if connecting over TLS.
problems with Cisco VCS connecting to OCS over TLS, and also cause problems for OCS
components to talk to one another if connecting over TLS.
At this stage it is recommended that Microsoft Server 2008 R2 is not used as the server to install OCS
components on.
components on.
Further details on changes and limitations imposed when using Microsoft Server 2008 R2 may be
found on the Microsoft support site:
found on the Microsoft support site:
Recommended Microsoft Servers are:
Microsoft Server 2003
Microsoft Server 2003 R2
Microsoft Server 2008
Lync
Lync requires a 64 bit operating system; the operating system that Lync runs on must be:
Microsoft Server 2008 SP2 64 bit or
Microsoft Server 2008 R2 64 bit
Call forward from MOC/Lync to a VCS FindMe or
endpoint results in a ‘loop detected’ call
endpoint results in a ‘loop detected’ call
If a call from Cisco VCS is made to a MOC/Lync client which has a forward to another VCS registered
endpoint or a FindMe, then VCS sees this as a looped call.
endpoint or a FindMe, then VCS sees this as a looped call.