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Cisco Unified IP Phone 7960G/7940G Administration Guide for Cisco Unified Communications Manager 7.0 (SCCP)
OL-15498-01
Chapter 1 An Overview of the Cisco Unified IP Phone
Understanding Security Features for Cisco Unified IP Phones
Related Topics
• Identifying Encrypted and Authenticated Phone Calls, page 1-11
• Security Restrictions, page 1-11
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 Communications Manager. When a call in progress is authenticated, the call progress icon
to the right of the call duration timer in the phone LCD screen changes to the following 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 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 LCD screen changes to the following 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.
Related Topic
• Understanding Security Features for Cisco Unified IP Phones, page 1-7
• Understanding Security Profiles, page 1-10
• Security Restrictions, page 1-11
Security Restrictions
The following restrictions apply to encrypted calls:
• When establishing an encrypted call on a phone that is configured for encryption and associated with
a wideband codec region, Cisco
Unified Communications Manager ignores the wideband codec and
chooses another supported codec from the codec list that the phone presents. If the other devices in
the call are not configured for encryption, Cisco
Unified Communications Manager may establish
the authenticated/nonsecure call by using the wideband codec.
• A user cannot barge into an encrypted call if the phone that is used to barge is not configured for
encryption. When barge fails in this case, a reorder tone (fast busy tone) plays on the phone on which
the user initiated the barge.