Panasonic KX-TG4221N

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KX-TG4221N/KX-TG4222N/KX-TG4223N/KX-TG313SK/KX-TG4224N/KX-TG4225N/KX-TGA421N
9 Service Mode
9.1. How to Clear User Setting (Handset Only)
Handset
Press ,,, simultaneously until a beep sound is heard. Then single handset is initialized.
(The contents of user setting are reset to factory default)
*Usage time is not cleared.
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