You can turn off provisioning in the Provisioning tab of the web UI.
But you should check to see what parameter is different on the phone compared to the provisioning file. Normally the phone shouldn't reboot during provisioning unless there's a parameter that's changed.
Configure Multicast Paging on the Cisco IP Phone 7800 Series or 8800 Series Multiplatform Phone
The Cisco IP Phone 7800 and 8800 Series Multiplatform Phones provide voice communication over an Internet Protocol (IP) network...
Add Call Park on a Cisco 7800 or 8800 Series Multiplatform Phone Key Expansion Module
Call park allows the user of the phone to put an incoming call on hold so that the call can be retrieved on another phone. A call is park...