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RJ11 6P4C - 6 Positions 4 Contacts and found on line cords, used for telephone wall plates and control signals
RJ12 6P6C - 6 Positions 6 Contacts The RJ12 is the same size as an RJ11 and is also found on many line cords and is commonly used for telephone and control applications RJ12 connectors can be used in place of RJ11 applications, but RJ11 may or may not work in place of RJ12, depending on if the additional 2 contacts are needed.
RJ9 / RJ10 / RJ22 4P4C - 4 Positions 4 Contacts Modular Headset Connector This is the smallest of the modular plugs and is mostly used on handset cords
Read More https://en.wikipedia.org/wiki/Registered_jack