Cisco Cisco TelePresence Video Communication Server Expressway
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Media is connected directly between the internal SIP video endpoint and the B2BUA.
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Calls in both directions use the same signaling and media paths.
Lync Client Call to H.323 Video Endpoint
Figure 6 Call between internal Lync client and internal H.323 endpoint
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Licenses consumed by this call:
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1 traversal call license on VCS Control
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1 non-traversal call license on Gateway VCS
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Signaling flows through Lync, B2BUA, and VCS Control.
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Media is connected directly between the Lync client and the B2BUA.
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Media from the H.323 endpoint flows through the VCS Control and then to the B2BUA on the Gateway VCS.
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Calls made in the opposite direction (H.323 endpoint to Lync client) use the same signaling and media paths.
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Cisco VCS and Microsoft Lync Deployment Guide