SOURCE: programe my phone KX-T7730
The phone you have (KX-T7730) requires a phone system to operate. This phone can be installed on a few different Panasonic phone systems. You need a "programming" manual for the phone system to do what you want (not a user guide) so you will first need to determine which system you have. Look for a part number on the system itself, it should start with "KXT" just like the phone.
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