| 摘要 |
A portable telephone communication system has a plurality of mobile stations existing in a control zone which denotes a service area, a radio base station for communicating with the mobile stations, and a network managing apparatus for managing a network of the control zone. According to a request of a first mobile station of the mobile stations, the network managing apparatus registers voice data to be added to a call-in control signal which is to be transmitted to a second mobile station of the mobile stations, receives a call-out control signal transmitted from the first mobile station through the radio base station, adds-the registered voice data to the call-in control signal which is to be transmitted to the second mobile station, and transmits the call-in control signal to the second mobile station. The second mobile station outputs the voice data, which is added to the call-in control signal, before an answer to a call of-the first mobile station. Therefore, a user of the call-in side can reliably recognize the caller or can recognize a degree of importance of the call according to the voice before an answer to the call.
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