What type of messages should the phone be sending at this point?

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A Cisco 7925 phone at a client’s location is not registering with CUCM. The engineer analyzes a packet capture, sees that the phone receives an IP, and downloads the proper configuration file from TFTP successfully.

What type of messages should the phone be sending at this point?
B . 245
D . 323
E . MCGP
F . SCCP

Answer: D