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Cisco Unified IP Phone 7931G Administration Guide for Cisco Unified Communications Manager 8.0 (SCCP and SIP)
OL-20798-01
Chapter 1 An Overview of the Cisco Unified IP Phone
Understanding Security Features for Cisco Unified IP Phones
2. Cisco Unified Communications Manager assigns a secure conference bridge to the call.
3. As participants are added, Cisco Unified CM verifies the security mode of each phone (encrypted
or authenticated) and maintains the secure level for the conference.
4. The phone displays the security level of the conference call. A secure conference displays
(encrypted) or
(authenticated) icon to the right of “Conference” on the phone. If the icon
displays, the conference is not secure.
Note There are interactions, restrictions, and limitations that affect the security level of the conference call
depending on the security mode of the participants’ phones and the availability of secure conference
bridges. See Tables 1-5 and 1-6 for information about these interactions.
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. The phone displays the icon (encrypted) on the phone screen. This icon indicates that the phone
is configured for secure (encrypted) calls, but this does not mean that the other connected phone is
also protected.
3. 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, 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 1-5 provides information about changes to call security levels when
using Barge.
Table 1-5 Call Security Interactions When Using Barge
Initiator’s Phone
Security Level Feature Used Call Security Level Results of Action
Non-secure Barge Encrypted call Call barged and identified as non-secure call
Secure (encrypted) Barge Authenticated call Call barged and identified as authenticated call
Secure (authenticated) Barge Encrypted call Call barged and identified as authenticated call
Non-secure Barge Authenticated call Call barged and identified as non-secure call
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