Telephone connectors

Telephone connectors are used for making plug wires and patch cords.
Connectors are divided into phone (RJ11 and RJ12) and computer (RJ45) ones, typical and all-purpose, with a filling piece and without it, unshielded (UTP) and shielded (FTP).
Also, connectors differ in the number of contacts: 4, 6 or 8 ...