CALLBACK SYSTEM, TRANSMITTING TERMINAL, TELEPHONE RELAY SERVER, CALLBACK METHOD AND CALLBACK PROGRAM

摘要

The callback system comprises: a transmitting terminal which comprises a storing section configured to store an attribute data which is uniquely determined and given, and a transmission request processing section configured to transmit a callback request including the attribute data for starting a callback communication; a database configured to relate and store a callback transmission source telephone number used in the callback communication for each attribute group prepared by collecting a plurality of the attribute data; a charging target judging section configured to receive the callback request and extract the callback transmission source telephone number which corresponding to the attribute data included in the callback request, as a selection callback transmission source telephone number from the database; and a transmission processing section configured to carry out the callback communication with the transmitting terminal, with the selection callback transmission source telephone number as a transmission source telephone number.