No you cannot use it..KX-T7730 is a proprietary phone. It is therefore using a FOUR Wire connection to make it work. It Has TIP,Ring for Voice and Hi/LOW for data. You can use KX-TS500 (Analog Phone) because the output from PAP2T is Analog.
The 7730 is a Panasonic Analog System phone. It plugs into a Key Service Unit and the line port plugs into the PAP2T device. Model numbers like KXT-A624/824 are examples.
Carl
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