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Chapter 1
Using the Cisco Voice Gateway 200
FXS Emulation
As shown in Figure 1-6, you can use FXS analog signalling with the T1-CAS port
option to interconnect the PSTN and a Voice over IP network. In this
configuration, you define the DS-0 groups as FXS and create a dialing plan to
ensure that calls can be routed and set up between endpoints on the VoIP network
and the POTS devices on the T1 channel bank.
Figure 1-6
E&M Emulation
As shown in Figure 1-7, you can use the T1-CAS port on a Cisco VG200 gateway
with E&M analog emulation. E&M signalling emulation lets you use a
Cisco VG200 gateway to interconnect H.323 devices on a VoIP network with
POTS devices over a standard trunk (tie) line.
78-10322-02
Using FXS Analog Emulation with T1-CAS
T1-CAS
DS-0 groups 0-23
PSTN
DS-0 groups 0-23
FXS emulation
10/100BaseT Ethernet
Simple IP
telephony devices
Software Configuration Guide for the Cisco VG200
Using a Cisco VG200 Gateway with H.323
Port 0
Voice Gateway
Port 1
Cisco CallManager
H.323 endpoint
1-11
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