Secure Phone Calls
When security is implemented for a phone, you can identify secure phone calls by icons on the phone screen.
You can also determine whether the connected phone is secure and protected if a security tone plays at the
beginning of the call.
In a secure call, all call signaling and media streams are encrypted. A secure call offers a high level of security,
providing integrity and privacy to the call. When a call in progress is encrypted, the call progress icon to the
right of the call duration timer in the phone screen changes to the following icon: .
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.
Note
In a secure call, a security tone plays at the beginning of a call to indicate that the other connected phone is
also receiving and transmitting secure audio and video (if video is involved). If your call connects to a nonsecure
phone, the security tone does not play.
Secure calling is supported for connections between two phones only. Some features, such as conference
calling, shared lines, and Extension Mobility, are not available when secure calling is configured.
Note
The following sections describe call security.
Related Topics
Cisco Unified IP Phone security features, on page 27
Security Restrictions, on page 34
Secure Conference Call Identification
You can initiate a secure conference call and monitor the security level of participants. A secure conference
call is established by using this process:
1
A user initiates the conference from a secure phone.
2
Cisco Unified Communications Manager assigns a secure conference bridge to the call.
3
As participants are added, Cisco Unified Communications Manager verifies the security mode of each
phone and maintains the secure level for the conference.
4
The phone displays the security level of the conference call. A secure conference displays the secure icon
to the right of Conference on the phone screen.
Interactions, restrictions, and limitations that affect the security level of the conference call depend on the
security mode of the participant phones and the availability of secure conference bridges. See Call Security
Interactions and Restrictions, on page 32 for information about these interactions.
Note
Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager 10.0
(SIP)
31
Cisco Unified IP Phone
Secure Phone Calls
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