If you entered them in system speed dial then you'll need to enterpgogramming on either extension 10 or 11. Enter programming by pressing feature 00,then press feature and the number of the speed dial bank (600-699), then enter in the number you want to over write. press feature 00 when finished.
If your trying to change one of the one touch buttons on the set itsself then press feature 00, press the button you want to change, then enter in the new telephone number. prsss feature 00 to exit programming.
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