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Microsoft® Lync Server 2010 Unleashed by Tom Pacyk, Andrew Abbate, Alex Lewis

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A/V Edge

The A/V Edge role is responsible for providing audio and video media exchanges among internal, external, and federated contacts. The A/V Edge role uses the Interactive Connectivity Establishment (ICE), Simple Traversal Utilities for NAT (STUN), and Traversal Using Relay NAT (TURN) methods to enable endpoints to communicate even if behind a NAT device.

When possible, endpoints attempt to use a peer-to-peer connection for media streams, but when an endpoint is behind a NAT device such as a home router, the A/V Edge role can act as a relay point between the endpoints to facilitate communication. The A/V Edge service uses a combination of HTTPS port 443 and UDP port 3478 to negotiate and provide the media stream.

To support media traffic ...

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