If you have a look at the doc that comes with the set in the box it explains the LED sequences, I know when all 3 LED's are flashing (Line 1,2 & MWI) the set is ready to be registered.
Didn't mean for that to sound predantic just know that the info you're after is the doc that comes in the box with the phone, I never look at these myself so stumbled across it by luck really.
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