I have a 7937 that will not register to CCM. The phone boots up properly pulls DHCP with option 150 which provides the correct TFTP source. When you IP to the phone it displays the correct available CCMs. The phone seems to choose SRST over CCM. I have factory reset the phone, moved it to a new switch, and moved it to a new voice vlan all with no changes. If I remove ccm-fallback from the router the phone will finally register to CCM. As soon as I put ccm-fallback back on the router the phone will register to the router. There is NO ephone config that would maybe pull the phone.
Any help would be greatly appreciated!
Can you get a packet capture that covers the registration process? Best thing to do would be to start the capture and then plug the phone back into the network. We can then see what happens when the phone sends it's registration requests.
Please include the IP addresses of the CUCM, phone and SRST gateway.