Cisco 6901

Connections between two phones support protected calling. Some features, such as conference calling and
shared lines, are not available when protected calling is configured. Protected calls are not authenticated.
Note
Related Topics
Cisco Unified IP Phones Security Features, on page 16
Identify Protected Calls
A protected call establishes when your phone and the phone on the other end are set up for protected calling.
The other phone can be in the same Cisco IP network, or on a network outside the IP network. Protected calls
can only be made between two phones. Conference calls and other multiple-line calls do not support protected
calls.
A protected call establishes using this process:
1. A user initiates the call from a protected phone (protected security mode).
2. A security tone plays if the call connects to another protected phone, indicating that both ends of the
conversation are encrypted and protected. If the call connects to a non protected phone, then the secure
tone does not play.
Connections between two phones support protected calling. Some features, such as conference calling and
shared lines are not available when protected calling is configured.
Note
Call Security Interactions and Restrictions
Cisco Unified Communications Manager checks the phone security status when conferences establish 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 for Cisco
Unified IP Phone 6911.
Table 4: Call Security Interactions When Using Barge (Cisco Unified IP Phone 6911 Only)
Results of actionCall security levelFeature usedInitiator’s phone security
level
Call barged and identified
as nonsecure call
Encrypted callcBargeNonsecure
Call barged and identified
as authenticated call
Authenticated callcBargeSecure (encrypted)
Call barged and identified
as authenticated call
Encrypted callcBargeSecure (authenticated)
Call barged and identified
as nonsecure call
Authenticated callcBargeNonsecure
Cisco Unified IP Phone
21
Cisco Unified IP Phone
Identify Protected Calls