Refer to security policies in these guides:
•
Cisco Unified CallManager Security Guide, Release 5.0(4) 
•Cisco Unified CallManager Security Guide, Release 4.1(3)
•Specific component documentation is available in the Component Resources topic in the Resource Library.
Additional security information is included here for your reference:
•IP Security white papers and design guides
http://www.cisco.com/en/US/netsol/ns340/ns394/ns165/ns391/networking_solutions_package.html
•Integrated network security—SAFE Blueprint