VG-200
The VG-200 is a VoIP gateway which is modular, 1U rack-mounted, and based
on the Cisco 2600 chassis.The VG-200 is similar to the Cisco 2600, but without
routing capabilities. It supports connectivity to PBX, PSTN, analog and digital
dial access, and legacy voice mail systems, and has the capacity for up to four
analog ports or two digital ports. A common configuration of a small branch
office is the VG-200 with a NM-2V module and two VIC cards.The VIC cards
can be FXS, FXO, E&M, or ISDN Basic Rate Interface (BRI). An upgraded configuration
would have one digital T1/E1 voice module (NM-HDV), which has
either 1 or 2 ports.This configuration supports up to 60 voice channels.The VG-
200 communicates with Cisco CallManager via MGCP and H.323 protocol.
FXS and FXO are the only ports supported under the MGCP configuration
mode with CallManager.The next section contains an example configuration of
how you might implement MGCP in a small office environment using a VG200.
This example illustrates the use of multiple FXO and FXS ports.The FXS ports
could be used for a legacy conference speakerphone and fax machine with the
FXO ports providing PSTN connectivity.