Enabling Media Bypass

After the network components are in place, an organization has two choices when enabling Media Bypass support:

• Always Bypass—This setting indicates endpoints should attempt to use Media Bypass with IP/PSTN gateways at all times. This configuration is useful for simple, small deployments where control over when Bypass use is not required. When a call is routed to a trunk with the Enable Media Bypass option selected, Lync endpoints bypass the Mediation server role. All sites and subnets are mapped to a single Bypass ID with this setting. This option cannot be selected if Call Admission Control is also used. This is because bandwidth policy profiles are not applied when bypassing a Mediation server. Media Bypass should only be used in scenarios where WAN bandwidth is not an issue, so it is assumed there is no need to check for available bandwidth.

• Use Site and Region Information—This setting enables Media Bypass based on scenarios defined in the network configuration. The actual values in the bandwidth policy profiles are not important with this option, but the profiles are used to determine when Bypass should be used. If there is any bandwidth policy profile assigned to a site or link, it will be assigned a unique Bypass ID. Subnets within the site have a matching Bypass ID so that only endpoints within the site are allowed to use Media Bypass with the IP/PSTN gateways in that location.

The final step in configuring Media Bypass is to ensure the IP/PSTN gateways used in each location supports Media Bypass. Also be sure to enable Media Bypass on the trunk configuration used with each IP/PSTN gateway.