Hi, thats a Master socket the big yellow thing is a ringer capacitor, no longer needed in 2wire systems, R1 is the line test resistor not needed if unless you have a wiring maintenance contract with Telecom in which case they prefer to use a seperate test module and SP1 is a spark gap (overvolts arrestor), not needed unless you intend to take a lighting stike and the arrestor at the exchange or cabinet should do this task for you.
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