PURPOSE: To obtain the communication system in which any of plural relay network routes is selected based on the priority.
CONSTITUTION: The system is provided with a caller terminal equipment 11 that has a function of designating called terminal equipment information, relay path information representing a communication network through which communication passes, substitute replay path trying succeeding setting when a communication path setting for the relay path is unsuccessful and substitute relay path information representing the trial priority, a caller exchange 21 that has a function of detecting a call signal including information designated by the caller terminal equipment 11 and deciding relay communication networks 31-36 to be connected next, a called exchange 22 that has a function providing a call to the called terminal equipment 12 according to the called terminal equipment information, and the called terminal equipment 12. The caller exchange 21 tries setting of a series of a communication paths represented in the substitute relay path information with priority when the setting of a series of communication paths represented in the relay path information is unsuccessful.
AIHARA MASAO
OSUMI TAIZO
ONO HIROYASU
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