H04M1/00—Substation equipment, e.g. for use by subscribers
H04M1/64—Automatic arrangements for answering calls; Automatic arrangements for recording messages for absent subscribers; Arrangements for recording conversations
H04M1/65—Recording arrangements for recording a message from the calling party
Procede de determination de l'etat de contact du mecanisme principal d'etranglement avec un dispositif de mise en position du clapet d'etranglement