Specifications

Setting Up Secure Survivable Remote Site Telephony
How to Configure Secure SRST
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Cisco Unified Survivable Remote Site Telephony Version 4.0 System Administrator Guide
Configuring CAPF on Cisco Unified CallManager
The Certificate Authority Proxy Function (CAPF) process allows supported devices, such as
Cisco Unified CallManager, to request LSC certificates from Cisco Unified IP Phones. The CAPF utility
generates a key pair and certificate that are specific for CAPF, and the utility copies this certificate to all
Cisco Unified CallManager servers in the cluster.
For complete instructions on configuring CAPF in Cisco Unified CallManager, see the Cisco IP Phone
Authentication and Encryption for Cisco CallManager documentation.
Enabling SRST Mode on the Secure SRST Router
To configure secure SRST on the router to support the Cisco IP phone functions, use the following
commands beginning in global configuration mode.
SUMMARY STEPS
1. call-manager-fallback
2. secondary-dialtone digit-string
3. transfer-system {blind | full-blind | full-consult | local-consult}
4. ip source-address ip-address [port port]
5. max-ephones max-phones
6. max-dn max-directory-numbers
7. transfer-pattern transfer-pattern
8. exit
DETAILED STEPS
Command or Action Purpose
Step 1
call-manager-fallback
Example:
Router(config)# call-manager-fallback
Enters call-manager-fallback configuration mode.
Step 2
secondary-dialtone digit-string
Example:
Router(config-cm-fallback)# secondary-dialtone 9
Activates a secondary dial tone when a digit string is
dialed.