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Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 8.6 (SCCP and SIP)
OL-23091-01
Chapter 1 An Overview of the Cisco Unified IP Phones
Understanding Security Features for Cisco Unified IP Phones
In an authenticated call, all devices participating in the establishment of the call are trusted devices, and
authenticated by Cisco
Unified Communications Manager. When an in-progress call is authenticated,
the call progress icon to the right of the call duration timer in the phone LCD screen changes to this icon:
In an encrypted call, all devices participating in the establishment of the call are trusted devices, and
authenticated by Cisco
Unified Communications Manager. In addition, call signaling and media streams
are encrypted. An encrypted call offers a high level of security, providing integrity and privacy to the
call. When an in-progress call is being encrypted, the call progress icon to the right of the call duration
timer in the phone LCD screen changes to this icon:
Note If the call is routed through non-IP call legs, for example, PSTN, the call may be nonsecure even though
it is encrypted within the IP network and has a lock icon associated with it.
In a protected 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 and video (if video is involved). If your call is
connected to a non-protected phone, the security tone does not play.
Note Protected calling is supported for connections between two phones only. Some features, such as
conference calls, shared lines, Extension Mobility, and Join Across Lines are not available when
protected calling is configured. Protected calls are not authenticated.
Related Topic
• Understanding Security Profiles, page 1-15
• Understanding Security Features for Cisco Unified IP Phones, page 1-11
• Security Restrictions, page 1-21
Establishing and Identifying Secure Conference Calls
You can initiate a secure conference 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 (encrypted or authenticated security mode).
2. Cisco Unified Communications Manager assigns a secure conference bridge to the call.
3. As participants are added, Cisco Unified Communications Manager 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 screen. If 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 Table 1-5 and Table 1-6 for information about these interactions.