Radio telephone system having emergency speech control

Claim 1

A radio telephone system comprising: a subscriber exchanger accommodating a plurality of subscribers and a plurality of emergency call receiving devices each having a transmission function; a line exchanger interfacing with said subscriber exchanger; emergency speech office lines provided between said subscriber exchanger and said line exchanger; a plurality of channels coupling mobile stations and said line exchanger; emergency speech extension lines coupled to said line exchanger and corresponding to said emergency speech office lines one by one; first control means for coupling a mobile station which is one of said mobile stations and requests an emergency speech to one of said emergency call receiving devices through one of said channels, said line exchanger, one of said emergency speech office lines and said subscriber exchanger; memory means for storing a subscriber number of said mobile station which requests the emergency speech; ringing signal detecting means for detecting a ringing signal supplied from said one of said emergency call receiving devices through said one of said emergency speech office lines and a corresponding one of said emergency speech extension lines and directed to said mobile station which precedingly requests said emergency speech and for generating a detection signal when detecting said ringing signal; and second control means for reading out the subscriber number of said mobile station from said memory means when said detection signal is supplied from said ringing signal detecting means and for coupling said one of the emergency call receiving devices to said mobile station through said subscriber exchanger, said one of said emergency speech office lines, said subscriber exchanger and one of said channels.