Cisco CP-7911G-CH1 System Administrator Manual page 223

Configuring Secure SRST for SCCP and SIP
Configuring SIP SRTP for Encrypted Phones
This section specifies that SRTP should be used to enable secure calls and allows non-secure calls to
"fallback" to using RTP media.
SUMMARY STEPS
1.
2.
3.
4.
5.
6.
7.
DETAILED STEPS
Command or Action
Step 1
enable
Example:
Router> enable
Step 2
configure terminal
Example:
Router# configure terminal
Step 3
voice service voip
Example::
Router(config)# voice service voip
Step 4
srtp fallback
Example::
Router(config-voi-serv)# srtp fallback
Step 5
allow-connections sip to h323
Example:
Router(config-voi-serv)# allow-connections sip
to h323
OL-13143-04
enable
configure terminal
voice service voip
srtp fallback
allow-connections sip to h323
allow-connections sip to sip
end
Purpose
Enables privileged EXEC mode.
Enter your password if prompted.
•
Enters global configuration mode.
Enters voice service configuration mode.
Specifies that SRTP be used to enable secure calls and call
fallback.
SRTP fallback allows calls to fallback to non-secure mode
if SRTP is not available.
(Optional) Allows connections from SIP endpoints to H.323
endpoints.
Cisco Unified SCCP and SIP SRST System Administrator Guide
How to Configure Secure Unified SRST
223