Phone Call Security - Cisco 7821 Administration Manual

You can control access to the Settings menu by using the Settings Access field in the Cisco Unified
Note
Communications Manager Administration Phone Configuration window. For more information, see
the Cisco Unified Communications Manager Administration Guide.
Step 3
Choose LSC and press Select or Update.
The phone prompts for an authentication string.
Step 4 Enter the authentication code and press Submit.
The phone begins to install, update, or remove the LSC, depending on how the CAPF is configured. During
the procedure, a series of messages appears in the LSC option field in the Security Configuration menu, so
you can monitor progress. When the procedure is complete, Installed or Not Installed displays on the phone.
The LSC install, update, or removal process can take a long time to complete.
When the phone installation procedure is successful, the Installed message displays. If the phone displays
Not Installed, then the authorization string may be incorrect or the phone may not enabled for upgrading.
If the CAPF operation deletes the LSC, the phone displays Not Installed to indicate that the operation
succeeded. The CAPF server logs the error messages. See the CAPF server documentation to locate the logs
and to understand the meaning of the error messages.

Phone Call Security

When security is implemented for a phone, you can identify secure phone calls by icons on the phone screen.
You can also determine whether the connected phone is secure and protected if a security tone plays at the
beginning of the call.
In a secure call, all call signaling and media streams are encrypted. A secure call offers a high level of security,
providing integrity and privacy to the call. When a call in progress is encrypted, the call progress icon to the
right of the call duration timer in the phone screen changes to the following icon:
If the call is routed through non-IP call legs, for example, PSTN, the call may be nonsecure even though
Note
it is encrypted within the IP network and has a lock icon associated with it.
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 secure audio. If your call connects to a nonsecure phone, the security tone
does not play.
Secured calling is supported for connections between two phones only. Some features, such as conference
Note
calling, shared lines, and Cisco Extension Mobility are not available when secured calling is configured.
When a phone is configured as secure (encrypted and trusted) in Cisco Unified Communications Manager, it
can be given a "protected" status. After that, if desired, the protected phone can be configured to play an
indication tone at the beginning of a call:
• Protected Device: To change the status of a secure phone to protected, check the "Protected Device"
check box in the Phone Configuration window in Cisco Unified Communications Manager Administration
(Device > Phone).
Cisco IP Phone 7821, 7841, and 7861 Administration Guide for Cisco Unified Communications Manager 10.0 (SIP)
Supported Security Features
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