Table of Contents
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Chapter 8
Configuring Survivable Remote Site Telephony
Figure 8-2
Branch Office Cisco IP Phones Operating in Survivable Remote Site Telephony (SRST)
Mode
Fax
PCs
IP
IP
IP
Cisco IP phones
Configuring Survivable Remote Site Telephony
Task
Step 1
Enable SRST support and enters
Cisco CallManager fallback mode.
Step 2
Enable the Catalyst 4224 to receive messages
from the Cisco IP Phones through the specified
IP addresses and ports.
OL-2031-02
Telephone Telephone
V
Catalyst 4224
When SRST is enabled, Cisco IP Phones do not need to be reconfigured
individually during Cisco CallManager fallback mode because Cisco IP Phones
retain the same configuration used with the primary Cisco CallManager.
To configure SRST on the Catalyst 4224, use the following steps, beginning in
global configuration mode:
Catalyst 4224 Access Gateway Switch Software Configuration Guide
Configuring Survivable Remote Site Telephony
PSTN
IP
network
WAN
Cisco CallManager
disconnected
Command
C4224(config)# call-manager-fallback
C4224(config-cm-fallback)# ip
source-address ip-address port port
V
Central
8-7
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Troubleshooting
