Phone registration and tftp are 2 seperate things. CM registration is driven by the CM group configuration which is assigned to the phone's device pool. TFTP is the only means for the phone to download the configuration to know which CM to regsiter to. If after changing the tftp option the phone is not registering it's most likely becuase tftp service is not running on the SUB.
One thing to check. On the CCMAdmin page, under System > Server, do you have hostname or IP address?
If its hostname, you will need DNS configured on the phones and appropriate entries configured in the DNS. For the time being, you can change that entry to IP address of the servers instead of hostname. Restart the TFTP and CCM service on the servers and try again.
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