Cisco Cisco TelePresence Video Communication Server Expressway
Appendix 4 – Known interoperating limitations
Cisco VCS Deployment Guide: Microsoft Lync 2010 and Cisco VCS X6.1
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A workaround is possible if the format of the numbers that will be routed to the mediation server can
be configured into Cisco VCS: make a second zone to Lync Server, select the Custom Zone profile,
select the same options as would be selected if the Microsoft Office Communications Server 2007
Zone profile had been selected and in addition select ‘Searches are automatically responded to’=On.
Then configure one or more Search rules so that calls destined for the mediation server are routed to
this zone rather than to the standard Microsoft Office Communications Server 2007 zone.
be configured into Cisco VCS: make a second zone to Lync Server, select the Custom Zone profile,
select the same options as would be selected if the Microsoft Office Communications Server 2007
Zone profile had been selected and in addition select ‘Searches are automatically responded to’=On.
Then configure one or more Search rules so that calls destined for the mediation server are routed to
this zone rather than to the standard Microsoft Office Communications Server 2007 zone.
Cisco VCS Cluster without OCS Relay
Lync Server does not have a way of load balancing calls to a cluster of Cisco VCSs. There is no way
to tell Lync Server that there are multiple peers to receive calls for the Cisco VCS domain, and Lync
Server will not load balance on a DNS SRV record, and there is a limit in Lync Server (and Windows)
that the min TTL on Round Robin DNS is 5 minutes.
to tell Lync Server that there are multiple peers to receive calls for the Cisco VCS domain, and Lync
Server will not load balance on a DNS SRV record, and there is a limit in Lync Server (and Windows)
that the min TTL on Round Robin DNS is 5 minutes.
Use of Cisco VCS clusters with Lync Server and without OCS Relay therefore provides resilience, not
extra capacity.
extra capacity.
No audio on audio call through an ISDN gateway
Prior to version 1.5 the Cisco TelePresence ISDN GW sent RTP traffic from SSRC = 0; Lync would
not accept RTP traffic with SSRC = 0. From version 1.5 the ISDN GW sends RTP traffic from a
random, non zero, SSRC and Lync receives this correctly.
not accept RTP traffic with SSRC = 0. From version 1.5 the ISDN GW sends RTP traffic from a
random, non zero, SSRC and Lync receives this correctly.
Lync client receives no video if it holds and then resumes a call
Lync does not request fast picture updates and so unless full frames are automatically sent from time
to time by endpoints this results in no video on the Lync.
to time by endpoints this results in no video on the Lync.
Video will be seen by Lync when using:
MXP F8.0 or later SIP - as this supports the auto-generation of full video frames
Ex/C-Series TC3 or later – as this supports the auto-generation of full video frames
Cisco VCS X4.2 or later for calls interworked with H.323 endpoints – as Cisco VCS interworking
supports the auto-generation of full frame update requests
supports the auto-generation of full frame update requests
Even with these fixes, sometimes Lync complains that it has no audio device configured when
selecting resume … follow Lync’s instructions to update the audio device and resume will then work.
selecting resume … follow Lync’s instructions to update the audio device and resume will then work.
Microsoft Server
Microsoft Servers recommended are:
Operating Systems for Server Roles
Microsoft Lync Server 2010 supports the 64-bit editions of the following operating systems:
•
Windows Server 2008 R2 Standard operating system
•
Windows Server 2008 R2 Enterprise operating system
•
Windows Server 2008 R2 Datacenter operating system
•
Windows Server 2008 Standard operating system with Service Pack 2 (SP2)
•
Windows Server 2008 Enterprise operating system with SP2
•
Windows Server 2008 Datacenter operating system with SP2
Note: Lync Server 2010 is available only in 64-bit, which requires 64-bit hardware and 64-bit editions
of Windows Server. Lync Server 2010 is not available in a 32-bit version.
of Windows Server. Lync Server 2010 is not available in a 32-bit version.