Cisco Cisco IOS Software Release 12.4(6)T

The Media and Signaling Authentication and Encryption Feature for Cisco IOS H.323 Gateways  feature 
provides authentication, integrity, and encryption of voice media and call control signaling for H.323 
protocol-based voice gateways.

Your Cisco IOS software release may not support all of the features documented in this module. For the 
latest feature information and caveats, see the release notes for your platform and software release. To 
reach links to specific feature documentation in this module and to see a list of the releases in which each 
feature is supported, use the 

.

Use Cisco Feature Navigator to find information about platform support and Cisco IOS and Catalyst OS 
software image support. To access Cisco Feature Navigator, go to 

. An 

account on Cisco.com is not required.