/mcpProtected Device Gateways You can configure only supported Cisco Unified IP Phones and MGCP E1 PRI gateways as protected devices in Cisco Unified Communications Manager. Cisco Unified Communications Manager can also direct an MGCP Cisco IOS gateway to play secure and nonsecure indication tones when the system determines the protected status of a call. Protected devices provide these functions: • You can configure phones that are running SCCP or SIP as protected devices. • Protected devices can call nonprotected devices that are either encrypted or nonencrypted. In such cases, the call specifies nonprotected and the system plays nonsecure indication tone to the phones on the call. • When a protected phone calls another protected phone, but the media is not encrypted, the system plays a nonsecure indication tone to the phones on the call. Secure Tone Prerequisites • You must configure the MGCP gateway for SRTP encryption. Configure the gateway with this command: mgcp package-capability srtp-package. • The MGCP gateway must specify an Advanced IP Services or Advanced Enterprise Services image (for example, c3745-adventerprisek9-mz.124-6.T.bin). Secure Tone Configuration Task Flow Before you begin • Review Secure Tone Prerequisites, on page 584 Procedure Purpose Command or Action Generate a report to identify devices that support the Secure Tone feature. Generate a Phone Feature List, on page 5 Step 1 Configure the phone as a protected device. Configure Phone As a Protected Device, on page 585 Step 2 Configure multiple calls and call waiting settings for the protected device. Configure Directory Number for Secure Tones, on page 585 Step 3 Configure service parameters. Configure Secure Tone Service Parameters, on page 586 Step 4 This configuration allows the system to pass protected status of the call between Cisco (Optional) Configure MGCP E1 PRI Gateway, on page 586 Step 5 Unified IP Phone endpoints and the protected PBX phones that connect to the MGCP gateway. Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs 584 Presence and Privacy Features Protected Device Gateways