Secure and Nonsecure Indication Tones
The secure indication tone plays on a protected phone when the overall status of the call specifies protected; that is, when the system determines that the call is encrypted. The tone denotes that the call is protected and that confidential information may be exchanged. The tone comprises three long beeps. If the overall status of the call specifies protected, the tone begins to play on a protected phone as soon as the called party answers.
When the overall status of the call is not protected, the system plays nonsecure indication tone, which comprises six short beeps, on a protected phone.
Only callers on protected phones can hear secure and nonsecure indication tones. Callers on phones that are not protected never hear these tones.
Configuration designates a protected device in Unified Communications Manager. You can configure only supported Cisco Unified IP Phones and MGCP E1 PRI gateways as protected devices in Unified Communications Manager.
Unified Communications Manager can also direct an MGCP IOS gateway to play secure and nonsecure indication tones when the system determines the protected status of a call.
You can make the following types of calls that can use the secure and nonsecure indication tones:
Intracluster IP-to-IP calls
Intercluster calls that the system determines are protected
IP-to-Time-Division-Multiplexing (TDM) calls through a protected MGCP E1 PRI gateway