Cellular phone and mobile switching controller

Abstract

In a case where a cellular phone exists outside a WOS system service area, the cellular phone receives a not-connectable signal and an audio message from a mobile switching controller. The cellular phone conducts disconnection processing with the not-connectable signal as a tuning point. Moreover, the cellular phone stores an extension number and converts a dedicated special number into an external number for retransmission, thus establishing connection to a PBX. After the reception of a connection-accepted signal and an automatic exchange answer message from the PBX, the cellular phone automatically transmits the stored extension number.

1 . A cellular phone comprising: 
 a transceiver unit connected to an antenna for carrying out transmission and reception of a radio signal;    a speaker for audio reception;    a microphone for audio transmission;    a phone number inputting unit;    a display unit;    an internal memory;    a control circuit for controlling said transceiver unit, said speaker, said microphone, said inputting unit, said display unit and said internal memory, which are connected to said control circuit,    wherein an extension number storage area and a conversion table are provided in said internal memory,    when a dedicated special number and an extension number are transmitted, said extension number is stored in said extension number storage area,    when a DISCONNECT signal is received, a calling access to a phone number corresponding to said dedicated special number is made by reference to said conversion table after disconnection processing is once conducted, and    when a CONNECT signal is received, said extension number stored in said extension number storage area is transmitted.    
     
     
         2 . A mobile switching controller connected to a base transceiver subsystem, comprising a conversion table held in a state where a dedicated special number and a phone number are associated with each other, 
 wherein when a phone number received from said base transceiver subsystem is a dedicated special number, connection to a phone number associated with said dedicated special number is made by reference to said conversion table.    
     
     
         3 . The mobile switching controller according to  claim 2 , wherein said conversion table further includes a calling phone number.