Configure Global Settings for Media Bypass

[This is pre-release documentation and subject to change in future releases. This topic's current status is: Revising Per Tech Review]

Topic Last Modified: 2010-07-19

Note:
This topic assumes that you have already configured media bypass for any trunk connections from the Mediation Server to a peer (an IP-PSTN gateway, an IP-PBX, or a Session Border Controller at an Internet Telephony Service Provider) for a specific site or service for which you want media to bypass the Mediation Server. This topic also assumes that you have defined all central sites and branch sites in Communications Server Topology Builder in a way that matches the network region, network site, and subnet configuration that you performed according to the steps in “Create or Modify a Network Region”, “Create or Modify a Network Site”, and “Associate a Subnet with a Network Site”. If they do not match, then media bypass will not succeed.

Note:

This topic assumes that you have already configured media bypass for any trunk connections from the Mediation Server to a peer (an IP-PSTN gateway, an IP-PBX, or a Session Border Controller at an Internet Telephony Service Provider) for a specific site or service for which you want media to bypass the Mediation Server.

This topic also assumes that you have defined all central sites and branch sites in Communications Server Topology Builder in a way that matches the network region, network site, and subnet configuration that you performed according to the steps in “Create or Modify a Network Region”, “Create or Modify a Network Site”, and “Associate a Subnet with a Network Site”. If they do not match, then media bypass will not succeed.

In addition to enabling media bypass for individual trunk connections associated with a peer, you must also configure global settings. If you use the steps in this topic to configure global settings for media bypass, the assumption is that one or both of the following situations impacts your configuration:

You do not have good connectivity between Microsoft Communications Server 2010 endpoints and any peers for which you configured media bypass on the trunk connection.

Call admission control for bandwidth management is enabled.

Note:
For more information about the considerations for both call admission control and media bypass, see the “Call Admission Control of PSTN Connections” section of “Media Bypass and Mediation Server” in the Planning documentation.

Network region and network site information is shared between call admission control and media bypass advanced Voice features when both are enabled. Therefore, if you have already configured call admission control, you are not required to use the following procedure to edit the site and region information specifically for media bypass. Follow the steps in this procedure if you have not yet configured network regions and sites for call admission control, want to change media bypass settings.

Or, follow these steps if you wish to use site and region information in making the bypass decision, but have no intention of enabling call admission control. In such a case, bandwidth restricted links will still need to be represented via network inter-site policies as described in Create Network Inter-site Policies. The actual bandwidth constraints are not as important in this case because call admission control has not been enabled. Instead, these links are used to partition subnets to specify those with no bandwidth limits and can therefore employ media bypass. Note that this is also true when call admission control and media bypass are both enabled.

Furthermore, in order for bypass to work properly, there must be consistency between a site as defined in Communications Server Topology Builder and as it is defined when you configure network regions and network sites. For example, if you have a branch site that you defined in Communications Server Topology Builder as having only a PSTN gateway deployed, then that branch site must be configured with a Voice policy that enables branch site users to have their PSTN calls routed through the PSTN gateway at the branch site.

To configure site and region information for media bypass

Open Communications Server Control Panel.
In the left navigation bar, click Network Configuration.
Double-click the Global configuration in the table.
On the Edit Global Setting page, select the Turn on media bypass check box.
Click Use sites and region configuration.
Select the Enable bypass for non-mapped sites check box.
Click Commit.

Next, add subnets to the network site as described in “Associate Subnets with Network Sites for Media Bypass”. (The actual procedures for associating subnets with network sites are described in “Associate a Subnet with a Network Site”.) After you associate all subnets with network sites, media bypass deployment is complete.

Important:
If you have not already created network regions and network sites, you must first create those before you can proceed with media bypass deployment. For more information, see “Create or Modify a Network Region” and “Create or Modify a Network Site”.