Because they don't have a clue as to how to organize their products , I've added the common part numbers below. This is your common everyday telephones jack. RJ12 A 6-position jack which is often used for one line of a key telephone system. Same connectors as RJ11. Then as the caller releases the 'hold' button, it pops up the line button.
Timing is critical.
Same connectors as RJ11. Your standard two line phone - note the reversing of Tip and ring Same connectors as RJ11. Pin-outs would seem to be the union of RJ12 and RJ18. MB1 of that phone line. The standard four conductor modular jack that connects a telephone handset to its base unit.