[This is pre-release documentation and subject to change in future releases. This topic's current status is: Milestone-Ready]

Topic Last Modified: 2010-07-16

Follow the steps in this topic to use Topology Builder to define a peer with which you can associate a Mediation Server in order to provide connectivity to the PSTN for users enabled for Enterprise Voice. A peer to the Mediation Server can be an IP-PSTN gateway, an IP-PBX, or a Session Border Controller (SBC) for an Internet Telephony Service Provider (ITSP) to which you connect by configuring a SIP trunk.

It is not necessary to define a Mediation Server before you define its peer, but the procedures in this section describe how to define a standalone Mediation Server pool when there is at least one peer in the topology.

This topic assumes that you have set up at least one internal Enterprise pool or Standard Edition Server in at least one central site as described in “Define and Configure a Front End Pool” and “Publish the Topology” in the “Deploying Communications Server 2010 (Beta Refresh)” section of the Deployment documentation. This topic also assumes that you have verified that your infrastructure meets the prerequisites described in Software Prerequisites for Enterprise Voice and Security and Configuration Prerequisites for Enterprise Voice.

To define a peer for the Mediation Server

  1. Right-click the PSTN Gateways node, and then click New PSTN Gateway.

  2. In the New PSTN Gateway dialog box, type the FQDN or IP address of the peer.

    If you specify TLS as the transport type, you must specify the FQDN instead of the IP address of the peer of the Mediation Server.
  3. Under Sip Port, type the listening port that the gateway, PBX, or SBC will use for SIP messages from the Mediation Server. (By default, the ports are 5066 for TCP and 5067 for TLS on a gateway, PBX or SBC. On a Survivable Branch Appliance at a branch site, the default ports are 5081 for TCP and 5082 for TLS.)

  4. Under SIP Transport Protocol, click the transport type that the peer uses, and then click OK.

    For security reasons, we strongly recommend that you deploy a peer to the Mediation Server that can use TLS.
Before you proceed to the next step, ensure that the peer that you defined is running using the FQDN or IP address that you specified.

Next, to add the peer to the topology, follow the procedures in “Publish the Topology” in the “Completing the Topology Using the Topology Builder” section of the Deployment documentation. You must publish your topology each time you use Topology Builder to build or modify your topology so that the data can be used to install the files for Communications Server servers.