Installation guide

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Cisco Unified Wireless IP Phone 7921G Administration Guide for Cisco Unified CallManager Release 4.1, 4.2, 5.0

OL-10802-01

Chapter 1 An Overview of the Cisco Unified Wireless IP Phone 7921G

Understanding Security Features for Cisco Unified IP Phones

To view the security mode that is set for the phone, from the phone screen, choose

Settings > Device Information > Security > Security Mode. For more

information, see the “Viewing Security Information” section on page 7-2.

Related Topics

• Identifying Encrypted and Authenticated Phone Calls, page 1-15

• Viewing Device Information, page 7-6

• Security Restrictions, page 1-16

Identifying Encrypted and Authenticated Phone Calls

When security is implemented for a phone, you can identify authenticated or

encrypted phone calls by icons on the screen on the phone.

In an authenticated call, all devices participating in the establishment of the call

are authenticated by the Cisco Unified CallManager. 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 CallManager. In addition, call signaling and

media streams are encrypted. An encrypted call offers the highest 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, such as the PSTN, the call might be

non-secure even though it is encrypted within the IP network and has a lock icon

associated with it.