Patent ID: 6175731
Filing Date: 2001-01-16
Classification: H04M,H04W

Abstract:
A radio communication apparatus being capable of accommodating at least a first and second communication system, comprising:a transmitter for transmitting a call signal for connecting a line to the first communication system;a receiver for receiving a line connection unallowable signal from the first communication system, the line connection unallowable signal being received in response to the call signal and indicative that the line cannot be assigned;a change-over unit for changing over from the first communication system to the second communication system with which the radio communication apparatus shall communicate when the line connection unallowable signal is received by said receiver, whereby said transmitter transmits the call signal to the second communication system;an operator unit for inputting a first telephone number, whereby the call signal is transmitted to the first communication system;a memory for storing the first telephone number;a reader unit for reading the first telephone number from said memory when a changing-over from the first communication system to the second communication system is performed by said change-over unit, whereby the call signal is transmitted to the second communication system from said transmitter; anda converter for converting the first telephone number stored in said memory into a second telephone number for said second communication system when the call signal to said second communication system is to be transmitted.