In Callmanager 5.o, you can configure the encryption key to acheive this. If you are operating your phone in a secure environment, you must manually configure the encryption key that the phone will use to decrypt the configuration file downloaded from Cisco Unified Call Manager. You may configure the encryption key by using either the LCD screen on the phone or by using the Phone Configuration Web page. Check this out for the configuration: http://www.cisco.com/en/US/products/hw/phones/ps379/products_administration_guide_chapter09186a00805f1f15.html#wp1268177
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