/mcp• IP to TDM calls over an MGCP gateway E1 connection (the MGCP gateway must be a protected device) Secure Phone Call Identification You can establish and identify a secure call when your phone and the phone on the other end is configured for secure calling. Conference calls support secure calls after secure conference bridge is set. A secured call is established when you initiate a call from a secured phone (secured mode). A secure icon appears on the phone screen and indicates that the phone is configured for secure calls, but does not mean that the other phone connected is also secured. You will hear a security tone if the call connects to another secured phone, indicating that both ends of the conversation are encrypted and secured. If the call connects to a non secure phone, you will not hear the security tone. Note Secure Icons and Tones Tips Secure calling is supported between two phones. For protected phones, features such as conference calling, shared lines, and Extension Mobility, are not available when secure calling is configured. Only callers on protected phones can hear secure and non secure indication tones. Callers on non protected phones don’t hear these tones. For video calls, the system plays secure and non secure indication tones on protected devices. All phones that support security icons display call security level. • The phone displays a shield icon for calls with a signaling security level of authentication. A shield icon identifies a secured connection between Cisco IP devices. This icon indicates that the devices use encrypted signaling. • The phone displays a lock icon for calls with encrypted media. This icon indicates that the devices use encrypted signaling and encrypted media. • Some phone models display only the lock icon. The security status of a call can change for point-to-point, intracluster, intercluster, and multihop calls. SCCP line, SIP line, and H.323 signaling support notification of call security status changes to participating endpoints. The protected phones only play the secure or nonsecure indication tones. The non protected phones never play indication tones. If the overall call status changes during the call, the indication tone changes and the protected phone play the appropriate tone. Below are few scenarios when a protected phone plays an appropriate tone: • If you enable the Play Secure Indication Tone option. • When end-to-end secure media is established and the call status is secure, the phone plays the secure indication tone—three long beeps with pauses. • When end-to-end non-secure media is established and the call status is non secure, the phone plays the non secure indication tone—six short beeps with brief pauses. Security Guide for Cisco Unified Communications Manager, Release 15 and SUs 175 Basic System Security Secure Phone Call Identification