Cisco 7936 device not trusted

Hi, I am trying to setup a Cisco 7936 phone. Users can call this phone but no outgoing calls seems to be possible. Also in the Cisco Unified Communications Manager, it says ' Device not Trusted'. Could someone throw some light on this issue please?

Thanks
jameshfd21Asked:
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btanExec ConsultantCommented:
If I may find this useful. Pls do note the system determines whether the device is trusted, based on the device type. You cannot configure whether the 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. Cisco 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.

https://supportforums.cisco.com/discussion/10809676/vg248-device-not-trusted
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jameshfd21Author Commented:
Thanks for the information.
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