If the Mediation Server component is installed on the Front End Pool and has its own network card, or if the Mediation Server is its own Pool with a dual NIC, we have a dedicated LAN between the Mediation Server and the PSTN Gateway. In other words – a dedicated LAN cable to the PSTN.

Some restrictions and possibilities related to this setup are outlined below:

As the LAN is isolated and not routed, it is possible to run IP traffic on this dedicated network segment without encryption. This reduces the CPU utilization on both the PSTN gateway and the Mediation Server pool. However, media-bypass is not possible in this configuration.