The invention relates to methods for testing analog telephone line equipment including, in particular to detect faults in their hybrid resistor arrays.It consists in isolating the equipment from the telephone line and then applying the normal ringing signal to it. If the resistor array is defective, the output logic signal of the off-hook/on-hook detector circuit comprises a succession of 0 and 1 at the frequency of the ringing signal, which indicates the fault.This makes it possible to eliminate the equipment test relay usually employed.