/mcpc) Gratuitous ARP d) PC Voice VLAN Access e) Web Access Tip To review information on these settings, click the help icon that appears next to the parameters in the Phone Configuration window. Step 5 Choose Disabled from the drop-down list for each parameter that you want to disable. To disable the speakerphone or speakerphone and headset, check the corresponding check boxes. Step 6 Click Save. Step 7 Click Reset. Trusted Devices Unified Communications Manager allows Security icons to be enabled by phone model on Cisco IP Phones. The Security icon indicates whether the call is secure and the connected device is trusted. A Trusted Device represents a Cisco device or a third-party device that has passed Cisco security criteria for trusted connections. This includes, but is not limited to, signaling/media encryption, platform hardening, and assurance. If a device is trusted, a Security icon displays and a secure tone plays on supported devices. Also, the device may provide other features or indicators that are related to secure calls. Unified Communications Manager determines whether a device is trusted when you add it to your system. The security icon displays for information purposes only, and the administrator cannot configure it directly. Unified Communications Manager also indicates whether a gateway is trusted by displaying an icon and a message in Unified Communications Manager Administration. This section describes the behavior of the security icon for trusted devices on both the Cisco IP Phones and in Unified Communications Manager Administration. Cisco Unified Communications Manager Administration The following windows in Unified Communications Manager Administration indicate whether a device is trusted: Gateway Configuration For each gateway type, the Gateway Configuration window (Device > Gateway) displays either Device is trusted or Device is not trusted, along with a corresponding icon. The system determines whether the device is trusted, based on the device type. You cannot configure whether the device is trusted. Phone Configuration For each phone device type, the Phone Configuration window (Device > Phone) displays either Device is trusted or Device is not trusted, along with a corresponding icon. The system determines whether the device is trusted, based on the device type. You cannot configure whether the device is trusted. Security Guide for Cisco Unified Communications Manager, Release 15 and SUs 134 Basic System Security Trusted Devices