Establishing And Identifying Secure Calls; Call Security Interactions And Restrictions - Cisco 8961 Administration Manual

Chapter 1 An Overview of the Cisco Unified IP Phone
4.
There are interactions, restrictions, and limitations that affect the security level of the conference call
Note
depending on the security mode of the participant's phones and the availability of secure conference
bridges. See

Establishing and Identifying Secure Calls

A secure call is established when your phone, and the phone on the other end, is configured for secure
calling. The other phone can be in the same Cisco IP network, or on a network outside the IP network.
Secured calls can only be made between two phones. Conference calls and other multiple-line calls are
not supported.
A secured call is established using this process:
1.
2.
3.
Secured calling is supported for conversations between two phones. Some features, such as conference
Note
calling, shared lines, and Cisco Extension Mobility are not available when secured calling is configured.

Call Security Interactions and Restrictions

Cisco Unified Communications Manager checks the phone security status when conferences are
established and changes the security indication for the conference or blocks the completion of the call
to maintain integrity and also security in the system.
call security levels when using Barge.
Table 1-7 Call Security Interactions When Using Barge
Initiator's Phone
Security Level Feature Used
Non-secure Barge
Secure Barge
Table 1-8
phone security level, the security levels of participants, and the availability of secure conference bridges.
Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager 8.6 (SIP)
The phone displays the security level of the conference call. A secure conference displays
to the right of "Conference" on the phone screen.
Table 1-7 and Table 1-8
A user initiates the call from a secured phone (secured security mode).
The phone displays the
configured for secure calls, but this does not mean that the other connected phone is also secured.
A security tone plays if the call is connected to another secured phone, indicating that both ends of
the conversation are encrypted and secured. If the call is connected to a non-secured phone, then the
secure tone is not played.
Call Security Level
Encrypted call
Encrypted call
provides information about changes to conference security levels depending on the initiator's
Understanding Security Features for Cisco Unified IP Phones
for information about these interactions.
icon ( secure) on the phone screen. This icon indicates that the phone is
Table 1-7
Results of Action
Call barged and identified as non-secure call
Call barged and identified as secure call
provides information about changes to
icon
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