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If it is getting an IP address, goto that IP address and there you will be able to see some console messages. See if alternate TFTP is set and is going to a different CM server. If so change it to the ip of your CM.
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
I would try logging into your CCME and deleting that phone from the user list. That way, it will have to contact your server and redownload all the necessary files. If that doesn't work, I would try using the factory reset code which would completely reset it. Both of these require that your server is up and running properly.
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.