In order to re-register handsets with TRU8866 base unit, you have to reset the base unit, de-register the handsets, and then re-register the handsets. To reset the base station, disconnect the power from the base and then press and hold the CID, Intercom, and Exit keys while you connect the power. Wait for the beep, and let go of the keys. Now re-register the handsets - the first one will become #1, and so on.
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