In a secure call, all call signalling 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 icon
on the phone screen changes to the lock 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.
Secured calling is supported for connections between two phones only. Some features, such as conference
calling, and Cisco Extension Mobility are not available when secured calling is configured.
Note
Initiate secure conference call
You can initiate a secure conference call and monitor the security level of participants. A secure conference
call is established using this process:
Procedure
Step 1
A user initiates the conference from a secure conference phone.
Step 2
Cisco Unified Communications Manager assigns a secure conference bridge to the call.
Step 3
As participants are added, Cisco Unified Communications Manager verifies the security mode of each phone
and maintains the security level for the conference.
There are interactions, restrictions, and limitations that affect the security level of the conference call depending
on the security mode of the participant phones and the availability of secure conference bridges. For more
information about the interactions, see Call security interactions and restrictions, on page 26
Step 4
If the conference call is secure the icon is displayed on the screen.
Initiate secure phone call
A protected call is established when your phone and the phone on the other end are configured for protected
calling. The other phone can be on the same Cisco IP network or on a network outside of the IP network.
Protected calls can only be made between two phones. Conference calls cannot be protected.
A protected call is established using this process:
Cisco Unified IP Conference Phone 8831 Administration Guide for Cisco Unified Communications Manager 9.0
25
Cisco Unified IP Conference Phone 8831
Encrypted phone call identification
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