“KX-TGA402 / KX-TGA101S I HAVE A 4-PHONE CORDLESS PHONE SET USING PANASONIC KX-TGA402 PHONES.. I WANT TO ADD A 5th PHONE WITH A HEADSET JACK. I'M LOOKING AT USING A KX-TGA101S FOR THAT PURPOSE. I REALIZE THE CHARGING BASES ARE DIFFERENT AND WOULD USE A COMPATIBLE BASE WITH IT, BUT I NEED TO KNOW IF THE PHONES ARE ELECTRONICALLY COMPATIBLE. I.E. CAN THE KX-TGA101S BE REGISTERED AND COMMUNICATE WITH THE KX-TG402 BASE? - THANKS!”