Installation guide

Chapter 1 An Overview of the Cisco Unified Wireless IP Phone 7921G
Understanding Security Features for Cisco Unified IP Phones
1-10
Cisco Unified Wireless IP Phone 7921G Administration Guide for Cisco Unified CallManager Release 4.1, 4.2, 5.0
OL-10802-01
Understanding Security Features for Cisco Unified
IP Phones
Implementing security in the Cisco Unified CallManager system prevents identity
theft of the phone and Cisco Unified CallManager server, and also prevents data,
call signaling, and media stream tampering.
To alleviate these threats, the Cisco IP telephony network establishes and
maintains authenticated and encrypted communication streams between a phone
and the server, digitally signs files before they are transferred to a phone, and
encrypts media streams and call signaling between Cisco Unified IP phones.
Table 1-1 shows where you can find additional information about security in this
and other documents.
Table 1-1 Cisco Unified IP Phone and Cisco Unified CallManager Security Topics
Topic Reference
Detailed explanation of security, including set up,
configuration, and troubleshooting information
for Cisco Unified CallManager and Cisco
Unified IP Phones
Refer to Cisco Unified CallManager Security
Guide
Security features supported on the Cisco Unified
IP Phone
See the “Overview of Supported Security
Features” section on page 1-11
Restrictions regarding security features See the “Security Restrictions” section on
page 1-16
Viewing a security profile name when running
Cisco Unified CallManager 5.0 or later
See the “Understanding Security Profiles” section
on page 1-14
Identifying phone calls for which security is
implemented
See the “Identifying Encrypted and Authenticated
Phone Calls” section on page 1-15
Transport Layer Security (TLS) connection See the “Networking Protocols Used with Cisco
Unified Wireless IP Phones” section on page 2-8
See the “Phone Configuration Files and Profile
Files” section on page 2-25
Security and the phone startup process See the “Understanding the Phone Startup
Process” section on page 3-26