
CHAPTER
8-1
Cisco Catalyst 4000 Access Gateway Module Installation and Configuration Note
OL-3008-01
8
Configuring the DSP Farm
This chapter describes how to configure the IP telephony conferencing and transcoding services on the
Cisco Catalyst 4000 Access Gateway Module (AGM).
Note Before you configure the IP telephony conferencing and transcoding services in the AGM, you need
to set up the module and configure the services in Cisco CallManager.
This chapter contains these major sections:
• About the DSP Farm, page 8-1
• Configuring IP Telephony Gateway Mode, page 8-5
• Troubleshooting the AGM, page 8-9
About the DSP Farm
The Digital Signal Processor (DSP) farm allows the AGM to transmit voice traffic in packets using the
Internet Protocol (IP) on a data network. To support voice over IP (VoIP), the DSP farm converts signal
information from telephony-based protocols (DS0) to packet-based protocols (IP).
Under the control of the Cisco CallManager, the DSP farm can also provide conferencing, transcoding
services, and support for Cisco IP Phones.
The DSP farm can be configured in two different modes:
• VoIP Gateway Mode, page 8-1
• IP Telephony Gateway Mode, page 8-2
VoIP Gateway Mode
In Enterprise telephony, VoIP is often referred to as toll-bypass. Toll-bypass enables businesses to send
their intra-office voice and fax calls over their existing TCP/IP network. By moving this traffic off the
Public Switched Telephone Network (PSTN), businesses can immediately save on long-distance charges
by using extra bandwidth on their data network.
The VoIP gateway is the default mode for the AGM if the four DSP SIMMs are installed and configured
for the PSTN interfaces. Without the four DSP SIMMs, the AGM defaults to the IP WAN router mode.
Comentarios a estos manuales