CONECTOR RJ11 Y CABLE DE 2 - 4 ó 6 HILOS ¿CUALES UTILIZO PARA MI COMPROBADOR DE TOMA DE TELEFONO? - YouTube
Amazon.com: ECS RJ11 Line 1/Line 2 Phone Cable Splitter Adapter - Split a 2 Line Wall Jack Into 2 Separate Single Lines or 2 Single Wall Jacks Into a 2 Line Phone : Electronics