Abstract: In a communication system, a file communication apparatus includes an address management portion for storing information about a corresponding relationship between a telephone number of a telephone set and a network address of a computer, a file receiving portion for receiving the network address and the voice file which are transmitted from the computer, a file storing portion for storing the received voice file, a DA conversion portion for converting the stored voice file into a voice signal, and a telephone control portion for transmitting the voice signal. The file communication apparatus further includes a main control portion which obtains the telephone number corresponding to the received network address based on the relationship in the address management portion, and controls the telephone control portion to transmit the voice signal to the telephone set corresponding to the obtained telephone number.

Abstract: A portable handy phone system comprises a first radio base station connected to a telephone network for executing radio communication with portable handy phones existing in a first radio communication zone, and a second radio base station connected to the telephone network for executing radio communication with portable handy phones existing in a second radio communication zone different from the first radio communication zone. The first radio base station comprises a first radio interface section for executing radio communication with portable handy phones in the first radio communication zone, a first system-to-system interface section for communicating with the second radio base station, and a first control section.