Secure Phone Call Identification
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
A user initiates the call from a secured phone (secured security mode).
2
The phone displays the secure icon
on the phone screen. This icon indicates that the phone is configured
for secure calls, but this does not mean that the other connected phone is also secured.
3
A security tone plays if the call connects to another secured phone, indicating that both ends of the
conversation are encrypted and secured. If the call connects to a nonsecured phone, the secure tone does
not play.
Secured calling is supported for conversations between two phones. Some features, such as conference
calling, shared lines, and Cisco Extension Mobility are not available when secured calling is configured.
Note
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 security in the system. The following table provides information about changes to call security levels
when using Barge.
Table 4: Call Security Interactions when using Barge
Results of action
Call security level
Feature used
Initiator phone
security level
Call barged and identified as nonsecure call
Encrypted call
Barge
Nonsecure
Call barged and identified as secure call
Encrypted call
Barge
Secure
The following table provides information about changes to conference security levels depending on the initiator
phone security level, the security levels of participants, and the availability of secure conference bridges.
Table 5: Security Restrictions with Conference Calls
Results of action
Security level of
participants
Feature
used
Initiator phone
security level
Nonsecure conference bridge
Nonsecure conference
Secure
Conference
Nonsecure
Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager
10.0 (SIP)
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Cisco Unified IP Phone
Secure Phone Calls
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