Microsoft® Lync Server 2010 Unleashed

Bypass IDs

Media Bypass works by assigning a unique Bypass ID to each location, and each subnet associated with that location automatically inherits the same Bypass ID. When a Lync endpoint attempts a call, the subnet of the endpoint is examined. If the Bypass ID of the subnet matches the Bypass ID of the subnet where the IP/PSTN gateway resides, Media Bypass will be leveraged.

The same concept applies for inbound calls from the PSTN. When the IP/PSTN gateway receives a call and sees an endpoint with a matching Bypass ID, the audio flows directly to the Lync client. Using the network configuration example in Figure 28.8, the San Francisco, San Jose, and Sacramento sites share a Bypass ID because they are not bandwidth constrained. The Santa Cruz ...