What is a Gateway?

A gateway is a Network Access Server (NAS) acting as an interface between a circuit-switched Public Switched Telephone Network (PSTN) and a packetized H.323 Voice-over-IP (VoIP) network.  

A gateway is the point at which a circuit-switched fax or voice call is encoded (using a codec) and repackaged into IP packets, or vice versa. A gateway initiates a call setup with an H.323 gatekeeper through H.225 RAS. The originating gateway terminates the VoIP call to an appropriate destination gateway with the gatekeeper's assistance.

A gateway is a network element in a dial plan that is managed by VRC.

Using the VRC client, you can add hunt groups and voice source groups to a gateway, and edit the attributes of voice ports and trunk groups.

The VRC network supports the following Cisco platforms as H.323 gateways:

Note: VRC support of certain platforms are limited to the Cisco IOS release running on the device. Refer to VRC Feature Sets for more information.