Question: are rj11 and rj12 interchangeable?
Answer: This is because they both use the same six slot connector. The only difference between these two is in how they are wired and the number of the wires that are being used. RJ12 is a 6P6C wiring standard. ... RJ11 is a 6P4C wiring standard and only has four wires connected and the remaining two slots are no longer used.