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Cisco Unified IP Phone 6901 and 6911 Administration Guide for Cisco Unified Communications Manager 8.5 (SCCP and SIP)
OL-23874-01
Chapter 1 An Overview of the Cisco Unified IP Phone
Understanding Security Features for Cisco Unified IP Phones
Related Topic
• Understanding Security Features for Cisco Unified IP Phones, page 1-10
• Understanding Security Features for Cisco Unified IP Phones, page 1-10
Establishing and Identifying Protected Calls
A protected call is established when your phone, and the phone on the other end, is configured 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 are not supported.
A protected call is established using this process:
1. A user initiates the call from a protected phone (protected security mode).
2. A security tone plays if the call is connected to another protected phone, indicating that both ends
of the conversation are encrypted and protected. If the call is connected to a non-protected phone,
then the secure tone is not played.
Note Protected calling is supported for conversations between two phones. Some features, such as conference
calling and shared lines are not available when protected calling is configured.
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 also security in the system.
Table 1-6 provides information about changes to call security levels when using Barge for Cisco Unified
IP Phone 6901 and 6911.
Table 1-7 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.
Ta b l e 1-6 Call Security Interactions When Using Barge (Cisco Unified IP Phone 6911 only)
Initiator’s Phone
Security Level
Feature Used Call Security Level Results of Action
Non-secure cBarge Encrypted call Call barged and identified as non-secure call
Secure (encrypted) cBarge Authenticated call Call barged and identified as authenticated call
Secure
(authenticated)
cBarge Encrypted call Call barged and identified as authenticated call
Non-secure cBarge Authenticated call Call barged and identified as non-secure call