Cisco 6921 Administration Guide

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Cisco Unified IP Phone 6921, 6941, 6945, and 6961 Administration Guide for Cisco Unified Communications Manager 8.6 (SCCP and SIP)
OL-24567-01
Chapter
Understanding Security Features for Cisco Unified IP Phones
Note Protected calling is supported for conversations between two phones. Some features, such as conference
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.
Table 1-7 provides information about changes to call security levels when
using Barge.
Table 1-8 provides information about changes to conference security levels depending on the initiator’s
phone security level, the security levels of participants, and the availability of secure conference bridges.
Table 1-7 Call Security Interactions When Using Barge
Initiator’s Phone
Security Level Feature Used Call Security Level Results of Action
Non-secure cBarge Encrypted call Call barged and identified as nonsecure call
Secure cBarge Secure call Call barged and identified as Secure call
Table 1-8 Security Restrictions with Conference Calls
Initiator’s Phone
Security Level Feature Used Security Level of Participants Results of Action
Non-secure Conference Encrypted Nonsecure conference bridge
Nonsecure conference
Secure Conference At least one member is
non-secure
Secure conference bridge
Nonsecure conference
Secure Conference All participants are encrypted Secure conference bridge
Secure encrypted level
conference
Secure Join Encrypted Secure conference bridge
Conference remains secure
Non-secure cBarge All participants are encrypted Secure conference bridge
Conference changes to
non-secure
Non-secure MeetMe Minimum security level is
encrypted
Only non-secure conference
bridge is available and used
Non-secure conference
Secure MeetMe Minimum security level is
nonsecure
Only secure conference bridge
available and used
Conference accepts all calls

Cisco 6921 Specifications

General

Brand	Cisco
Model	6921
Category	IP Phone
Language	English