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:
1750 Access Router
Catalyst 2600 Series Routers
3600 Series Routers
3700 Series Application Service Routers
AS5300 Series Universal Access Server
AS5350 Universal Gateway
AS5400 Series Universal Gateways
AS5800 Series Universal Access Servers
AS5850 Universal Gateway
7200 Series Internet Routers
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.