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The KX-TS4200B only has 2 ports at the back, first port supports both Lines 1 and 2 and the second port supports Lines 3 and 4. Regardless what type of phone jack you have the telephone will only recognize standard sized line cords either an RJ 11 or an RJ 14 ( RJ 14 is included in the package). If your current jack supports 4 lines together, that means you have an RJ61 interface, it is not compatible with the KX-TS4200B not unless the jack is split by a device or by your phone company.
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