Cisco 6921 Administration Manual page 32

Understanding Security Features for Cisco Unified IP Phones
Protected calling is supported for conversations between two phones. Some features, such as conference
Note
calling, shared lines, Cisco Extension Mobility, and Join Across Lines are not available when protected
calling is configured.
Call Security Interactions and Restrictions
Cisco Unified CM 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.
using Barge.
Table 1-7
Initiator's Phone
Security Level
Non-secure
Secure
Table 1-8
phone security level, the security levels of participants, and the availability of secure conference bridges.
Table 1-8
Initiator's Phone
Security Level
Non-secure
Secure
Secure
Secure
Non-secure
Non-secure
Secure
Cisco Unified IP Phone 6921, 6941, 6945, and 6961 Administration Guide for Cisco Unified Communications Manager 8.6 (SCCP and SIP)
1-20
Table 1-7 provides information about changes to call security levels when
Call Security Interactions When Using Barge
Feature Used
cBarge
cBarge
provides information about changes to conference security levels depending on the initiator's
Security Restrictions with Conference Calls
Feature Used
Conference
Conference
Conference
Join
cBarge
MeetMe
MeetMe
Call Security Level Results of Action
Encrypted call Call barged and identified as nonsecure call
Secure call Call barged and identified as Secure call
Security Level of Participants
Encrypted
At least one member is
non-secure
All participants are encrypted
Encrypted
All participants are encrypted
Minimum security level is
encrypted
Minimum security level is
nonsecure
Chapter
Results of Action
Nonsecure conference bridge
Nonsecure conference
Secure conference bridge
Nonsecure conference
Secure conference bridge
Secure encrypted level
conference
Secure conference bridge
Conference remains secure
Secure conference bridge
Conference changes to
non-secure
Only non-secure conference
bridge is available and used
Non-secure conference
Only secure conference bridge
available and used
Conference accepts all calls
OL-24567-01