ECS-RJ11 2 Line Phone Line 1 Line 2 Telephone Splitter Also Known As : RJ11 Line 1, Line 2 Splitter or KX-J24. The ECS-RJ112LS is an all-purpose 2-line phone splitter specifically engineered for users that prefer the reliability of analog phone systems. This is the only complete all-in-one hard molded dirt proof line-1/line-2 phone splitter on the market.