Cisco Cisco Expressway
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Cisco Expressway-C and Cisco Expressway-E for TURN server support
Example Values in this Deployment
The example presented uses the following values:
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The Lync environment uses
example.com
as the SIP domain. The SIP domain for Lync need not be the same as
the AD domain of Lync clients (the Lync login domain used in the login user name may be different from the
SIP domain used in the sign-in address).
SIP domain used in the sign-in address).
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The Cisco video network’s domain is
video.example.com
(used for video device registrations).
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Endpoints registered to the video network are provisioned by Unified CM and register with a DN in the format
3xxx.
3xxx.
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Lync clients registered to Lync are identified by URIs, for example:
—
David with a URI
david.jones@example.com
—
Alice with a URI
alice.parkes@example.com
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Lync Front End Server is configured with a static domain route which routes URIs with the Expressway's video
network domain (
network domain (
video.example.com
) to the Gateway Expressway. Take care when using domain static routes;
any traffic for that domain that Lync cannot handle locally will be routed to Expressway.
Features and Limitations
Expressway X8.1 or later is compatible with Lync 2010 and Lync 2013 clients, registered to Lync 2010 or Lync 2013
front end servers.
front end servers.
This topic describes more detailed aspects of the integrated environments.
Voice and Video Calling
SIP Calls
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SIP endpoints registered to Unified CM can make calls to Lync clients registered to Lync Server.
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Lync clients registered to Lync Server can make calls to SIP endpoints registered to Unified CM.
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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 Expressway) can handle 100 simultaneous calls between Lync and
the Expressway video environment.
B2BUA application (one application per Expressway) can handle 100 simultaneous calls between Lync and
the Expressway video environment.
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Media encryption (SRTP) is supported when TLS is used between Expressway and Lync and the Microsoft
Interoperability option key is added to the Gateway Expressway.
Interoperability option key is added to the Gateway Expressway.
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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.
Upspeeding a Voice Call to Video
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If a voice call is made from a Lync client to a UCM-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.
MXP Endpoints
Video from MXP endpoints to Lync 2013 H.264 SVC is limited to 15fps (video with other endpoints is 30fps).
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Cisco Expressway with Microsoft Lync Deployment Guide