Cisco Cisco Expressway
An external Lync client calls an internal SIP video endpoint
In this scenario an external Lync client (alice.parkes) calls an internal video system (david.jones.office).
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Signaling flows through the Microsoft Edge Server, Lync, B2BUA, and Unified CM.
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Media between the Lync client and the B2BUA flows either through the Microsoft Edge server or through
the Expressway-E TURN server – ICE searching is used to determine the ‘best’ path.
the Expressway-E TURN server – ICE searching is used to determine the ‘best’ path.
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Media is connected directly between the internal video endpoint and the B2BUA (as the call is SIP to SIP).
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Calls made in the opposite direction, internal video endpoint to external Lync client will use the same
signaling and media paths.
signaling and media paths.
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Licenses:
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1 rich media session license on “Lync gateway” Expressway
Signaling
Media
Microsoft Lync and Cisco Expressway Deployment Guide (X8.2)
Page 64 of 67
Appendix 6: Media paths and license usage for calls through B2BUA