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Cisco Unified IP Phone 7970G/7971G-GE Administration Guide for Cisco Unified Communications Manager 7.0
OL-15299-01
Chapter 1 An Overview of the Cisco Unified IP Phone
Understanding Security Features for Cisco Unified IP Phones
Related Topics
• Identifying Authenticated, Encrypted, and Protected Phone Calls, page 1-13
• Device Configuration Menu, page 4-10
• Security Restrictions, page 1-17
Identifying Authenticated, Encrypted, and Protected Phone Calls
When security is implemented for a phone, you can identify authenticated or encrypted phone calls by
icons on the screen that is on the phone.You can also determine if the connected phone is secure and
protected if a security tone plays at the beginning of the call.
In an authenticated call, all devices participating in the establishment of the call are authenticated by
Cisco Unified Communications Manager. When a call in progress is authenticated, the call progress icon
to the right of the call duration timer in the phone screen changes to this icon:
In an encrypted call, all devices participating in the establishment of the call are authenticated by the
Cisco Unified Communications Manager. In addition, call signaling and media streams are encrypted.
An encrypted call offers a high level of security, providing integrity and privacy to the call. When a call
in progress is being encrypted, the call progress icon to the right of the call duration timer in the phone
screen changes to this icon:
Note If the call is routed through non-IP call legs, for example, PSTN, the call may be nonsecure even though
it is encrypted within the IP network and has a lock icon associated with it.
In a protected call, a security tone plays at the beginning of a call to indicate that the other connected
phone is also receiving and transmitting encrypted audio. If your call is connected to a non-protected
phone, the security tone does not play.
Note Protected calling is supported for connections between two phones only. Some features, such as
conference calling, shared lines, Extension Mobility, and Join Across Lines are not available when
protected calling is configured. Protected calls are not authenticated.
Related Topic
• Understanding Security Features for Cisco Unified IP Phones, page 1-8
• Understanding Security Profiles, page 1-12
• Security Restrictions, page 1-17