Abstract: The invention concerns a method of intercepting a telephone call in a telecommunications system using at least one switch (12, 13; 24), in which signals in an interception loop (16) in said switch (12; 24) and to which the pulse coded multiplex (PCM) containing the call to be intercepted has been diverted are sampled at high impedance before they are directed to the addressee (14). The signal sampled at high impedance is directed to interception equipment (110) which extracts said call to be intercepted from the PCM. The signals in said interception loop (16) can include voice data and signaling interception data or only voice data, interception data concerning said call to be intercepted being transmitted to said interception equipment over a dedicated line (112).

Abstract: The invention relates to an electrothermal process of separation and refining of metals from recovery materials containing a distillable metal, characterized by the fact that it consists:on the one hand, in a melting stage where the process materials are placed in an electric furnace, in order to vaporize said distillable metal in view of extracting in vacuum the vapor of the distillable metal and subjecting it to oxidization at the same time, and of pouring into ingots the liquid metals remaining in the furnace pot, and,on the other hand, and not dependent on the melting stage, in a distillation stage of the distillable metal oxide thus collected, and a condensation of the resulting metal vapor in order to recover said distillable metal in a liquid form and to pour it into ingots.Applications: to the recovery of iron, nickel and cadmium contained in electric storage batteries.