The 7925 supports six PLKs in it's Phone Button Template. You can assign Speed Dials, BLF, DN, or any other normal PLK function. Additionally, if you have the Abbreviated Dial softkey enabled in the Softkey Template you can use those.
If the phone is set to show the Home Screen you would need to press the right arrow of the five-way D-pad to show lines and then scroll down to the appropriate speed dial. Optionally, there is a setting in the Model-Specific Configuration section of the phone in CUCM that allows you to change the default view from the home screen to the line view.
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