
8-2
Cisco Catalyst 4000 Access Gateway Module Installation and Configuration Note
OL-3008-01
Chapter 8 Configuring the DSP Farm
About the DSP Farm
In VoIP gateway mode, the AGM acts as an H.323 gateway. The H.323 gateway is a node on a LAN that
communicates with other H.323 terminals or gateways on other networks. H.323 is the standard for
deploying VoIP in a LAN.
Figure 8-1 shows the AGM VoIP gateway mode.
Figure 8-1 VoIP Gateway Mode
IP Telephony Gateway Mode
In IP telephony gateway mode, the AGM operates as a slave to Cisco CallManager. As in VoIP gateway
mode, the AGM functions as an H.323 gateway. However, with Cisco CallManager, the AGM can also
support conferencing and transcoding.
In IP telephony gateway mode:
• DSPs are subdivided for different uses
• 12 DSPs are available for analog and digital voice services
• 8 DSPs are available for transcoding
–
104 channels in software
–
16 channels in hardware
–
120 channels in total
• 4 DSPs for conferencing
–
24 channels
Figure 8-2 shows the IP telephony gateway mode.
Access Gateway
H.323
Access Gateway
IP WAN
44130
V V
PBX PBX
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