PERSONAL-CALL TELEPHONE EXCHANGE Russian patent published in 2003 - IPC

FIELD: automatic telephony; personal call of particular subscriber and remote control of terminals. SUBSTANCE: indirect-control telephone exchange has internal call servicing circuit incorporating number receiving center and call signal generating center; number receiving center is made as receiver of called subscriber line number and additional code number of call; call signal generating unit is coupled with output of number receiving center using call code received and is made in the form of shaper of one or more call signals controlled by this code and differing in time-frequency structure; these signals may be, for instance, of different-cadenza inductor type, different-jigger voice type, coded, combined coded and different-cadenza inductor ones. EFFECT: provision for personal addressing of telephone call. 1 cl, 7 dwg