Cisco Cisco TelePresence Video Communication Server Expressway
Voice and Video Calling
SIP and H.323 Calls
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SIP and H.323 endpoints can make calls via VCS Control to Lync clients registered to Lync Server.
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Lync clients registered to Lync can make calls to SIP and H.323 endpoints registered to VCS Control.
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SIP signaling and RTP media is always routed via the B2BUA application for calls involving Lync clients. Each
B2BUA application (one application per VCS) can handle 100 simultaneous calls between Lync and the VCS
video environment.
B2BUA application (one application per VCS) can handle 100 simultaneous calls between Lync and the VCS
video environment.
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Media encryption (SRTP) is supported when TLS is used between VCS and Lync and the Microsoft
Interoperability option key is added to the Gateway VCS.
Interoperability option key is added to the Gateway VCS.
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Lync Server accepts and handles call hold (and resume) requests.
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Lync clients can be the object of a transfer (even if there is an AM gateway involved in the call).
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The maximum resolution of an SVC to AVC converted call is 720p 30fps.
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Lync client sometimes notifies that it has no audio device configured when selecting resume. Follow Lync
client’s instructions to update the audio device and resume will then work.
client’s instructions to update the audio device and resume will then work.
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If a call from VCS is made to a Lync client which has a forward to another VCS-registered endpoint or a
FindMe, then VCS sees this as a "loop detected" call.
FindMe, then VCS sees this as a "loop detected" call.
Upspeeding a Voice Call to Video
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If a voice call is made from a Lync client to a VCS-registered endpoint, and then the video button is selected
to enhance the call to a video call, the video endpoint will correctly upspeed to video.
to enhance the call to a video call, the video endpoint will correctly upspeed to video.
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Interworking a Lync client to an H.323 endpoint, the call will only upspeed from voice to video if the upspeed
request occurs before the endpoint sends a BRQ lowering the connection bandwidth.
request occurs before the endpoint sends a BRQ lowering the connection bandwidth.
MXP Endpoints
Video from MXP endpoints to Lync 2013 H.264 SVC is limited to 15fps (video with other endpoints is 30fps).
Screen Sharing
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Lync clients can share their screen with standards-based endpoints in the video network, because the
Gateway VCS can transcode RDP media into H.264.
Gateway VCS can transcode RDP media into H.264.
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The reverse transcode (from H.264 to RDP) is not supported. If the endpoint is capable of putting the
presentation in the main video channel, then the Lync user can see the presentation that way. Otherwise, if
the parties are in a conference, the conference bridge will compose the presentation (from the standards-
based endpoint) into the main video it sends to the Lync user.
presentation in the main video channel, then the Lync user can see the presentation that way. Otherwise, if
the parties are in a conference, the conference bridge will compose the presentation (from the standards-
based endpoint) into the main video it sends to the Lync user.
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Lync 2013 for Windows is the required client version for screen sharing. Other client versions are not
supported for this feature.
supported for this feature.
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Lync Server 2013 is the required server version for screen sharing. Other server versions are not supported for
this feature.
this feature.
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Screen share transcoding is not supported on a clustered Gateway VCS.
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Screen sharing from Lync is supported when the Lync client is in a conference on a Cisco TelePresence
Server.
Server.
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Screen sharing from Lync is supported when the Lync client is in a conference hosted on MCU 5300 Series or
MCU MSE Series bridges, with the following caveats:
MCU MSE Series bridges, with the following caveats:
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When another endpoint steals the floor from the Lync presenter, the MCU does not revoke the floor. Lync
looks like it is still sharing, from the original presenter's point of view, when the other participants are not
seeing the Lync screen. See issue number
looks like it is still sharing, from the original presenter's point of view, when the other participants are not
seeing the Lync screen. See issue number
.
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Screen sharing from Lync is not supported when the Lync client is in conferences hosted on MCU 4200 Series
and MCU 4500 Series bridges.
and MCU 4500 Series bridges.
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Cisco VCS and Microsoft Lync Deployment Guide