You can not shut off CCM CSRST fall Back service. You need to either remove SRST reference in the device pool or for the phone specific configuration. I suggest you create device pool similar to one you have but without SRSR reference. Then you need to re-apply device pool in the phoone configuration and restart the phone.
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Here's a great little document from Cisco directly, called "Converting a Cisco 7940/7960 CallManager Phone to a SIP Phone and the Reverse Process" Easy to do, just follow the step-by-step directions. http://www.cisco.com/en/US/products/hw/phones/ps379/products_tech_note09186a0080094584.shtml
Try to manually reset the phone - **#"Settings" (this will unlock the configuration) + Network + menu under number "33" - erase the configuration. Then the phone configuration will be erased. Also you can manually set IP address and TFTP server