Cisco Cisco TelePresence Video Communication Server Expressway
An external Lync client calls an external video endpoint
In this scenario an external Lync client (alice.parkes) calls an external video endpoint (david.jones.external).
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Signaling flows through the Microsoft Edge Server, Lync, B2BUA, VCS Control and VCS Expressway.
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Media between the Lync client and the B2BUA flows either through the Microsoft Edge server or through
the VCS Expressway TURN server – ICE searching is used to determine the ‘best’ path.
the VCS Expressway TURN server – ICE searching is used to determine the ‘best’ path.
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Media between the external video endpoint and the B2BUA flows through the VCS Control / VCS
Expressway traversal link.
Expressway traversal link.
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Calls made in the opposite direction, external video endpoint to external Lync client use the same signaling
and media paths.
and media paths.
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Licenses:
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1 traversal call license and up to 18 TURN licenses on the VCS Expressway
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1 traversal call license on the VCS Control
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1 non-traversal call license on the “Lync gateway” VCS
Signaling
Media
Microsoft Lync and Cisco VCS Deployment Guide (X8.1)
Page 71 of 76
Appendix 5: Media paths and license usage for calls through B2BUA