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Cisco Unified IP Phone 8941 and 8945 Administration Guide for Cisco Unified Communications Manager 8.5 (SCCP and SIP)
OL-20851-01
Chapter
Understanding Security Features for Cisco Unified IP Phones
In a secure call, a security tone plays at the beginning of a call to indicate that the other connected phone
is also receiving and transmitting encrypted audio. For video calls, the user may first hear secure
indication tone for the audio portion of the call and then nonsecure indication tone for overall nonsecure
media. If your call is connected to a non-protected phone, the security tone does not play.
Note Secured calling is supported for connections between two phones only. Some features, such as
conference calling, shared lines, and Cisco Extension Mobilityare not available when secured calling is
configured.
Related Topic
• Understanding Security Profiles, page 1-13
• Understanding Security Features for Cisco Unified IP Phones, page 1-9
• Security Restrictions, page 1-17
Establishing and Identifying Secure Audio Conference Calls
You can initiate a secure conference audio call and monitor the security level of participants. A secure
conference call is established using this process:
1. A user initiates the conference from a secure phone.
2. Cisco Unified CM assigns a secure conference bridge to the call.
3. As participants are added, Cisco Unified CM verifies the security mode of each phone and maintains
the secure level for the conference.
4. The phone displays the security level of the conference call. A secure conference displays the
to the right of “Conference” on the phone screen.
Note There are interactions, restrictions, and limitations that affect the security level of the audio conference
call depending on the security mode of the participant’s phones and the availability of secure conference
bridges. See Table 1-5 and Table 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. For video calls, the user may first hear secure
indication tone for the audio portion of the call and then nonsecure indication tone for overall
nonsecure media. If the call is connected to a non-protected phone, then the secure tone is not
played.