| 摘要 |
PROBLEM TO BE SOLVED: To enable a caller to call a mobile station without considering the existence position of the mobile station by informing a line controller about that the mobile station is moved outside of a customer owned and maintained simple portable telephone system through a public easy portable telephone network, etc. SOLUTION: The line controller 4 is called before the mobile station 1 is moved and incoming call transfer is registered by a DTMF(dual tone multi-frequency) signal. When an incoming call occurs in the mobile station after registering, the incoming call transfer registering state of the mobile station 1 is referred to based on a call number in the customer owned and maintained simple portable telephone system of a call number correspondence table. Then, when an incoming call register and transfer state is set to be transfer 'existence', the call number of the mobile station 1 of the public simple telephone network 7 is retrieved based on the call number in then self-supporting simple portable telephone system of the call number correspondence table. Then, call origination is automatically executed by the retrieved call number of the mobile station of the public simple telephone network 7 so that the mobile station 1 is called through a public telephone communication network and the public simple portable telephone network 7. |
