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I'm assuming you are trying to wire an extension from the existing master socket? Or are you trying to do something with the master socket itself. Strictly speaking any wiring on the street side and up to the master socket should only be touched by the telephone company.
Most wiring for phones is dealt with by a IDC type push down tool. Very cheap plastic ones should be available from good DIY shops. Most phone terminals are numbered. Simply get your 6 core phone cable and ensure you keep the various wire strands matched to the numbers at each end.