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 19: Security Restrictions with Conference Calls
Results of actionSecurity level of
participants
Feature
used
Initiator phone
security level
Nonsecure conference bridge
Nonsecure conference
SecureConferenceNonsecure
Secure conference bridge
Nonsecure conference
At least one member is
nonsecure.
ConferenceSecure
Secure conference bridge
Secure encrypted level conference
SecureConferenceSecure
Initiator receives message Does not meet
Security Level, call rejected.
Minimum security level is
encrypted.
Meet MeNonsecure
Secure conference bridge
Conference accepts all calls.
Minimum security level is
nonsecure.
Meet MeSecure
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 should support secure call after secure conference
bridge set up.
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
The user hears a security tone 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 nonsecure phone, the user does not
hear the security tone.
Secure calling is supported between two phones. For protected phones, some features, such as conference
calling, shared lines, and Extension Mobility, are not available when secure calling is configured.
Note
Only protected phones play these secure or nonsecure indication tones. Nonprotected phones never play tones.
If the overall call status changes during the call, the indication tone changes and the protected phone plays
the appropriate tone.
Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager
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Supported Security Features
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