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at which step IP phone will upgrade firmware during it's registration process?

https://supportforums.cisco.com/docs/DOC-21496

The above document is a good explanation on how the IP phone register to a Call Manager.

My question is, if the factory load of IP phone firmware is older than the device defaut load configued in Call Manager, in which step will the IP phone download a new (higher) firmware from TFTP server?  Does CCM compares the phone load with it's configured device default load and ask IP phone to do so? Which SCCP command is used?

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Hall of Fame Super Gold

at which step IP phone will upgrade firmware during it's registr

Firmware version check and update is done after downloading .XML file, and before registration.

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