Communication system, route selection device, and route selection method

摘要

A communication system in which a plurality of communication networks are interconnected, wherein a connection between a communication network by a first line that performs communication using a first protocol and a connection between communication networks by a second line that performs communication by a second protocol A plurality of communication network interconnections including a plurality of communication network interconnections including a plurality of communication network interconnections in a communication system that is connected to the other communication network by the first line and which is provided in a communication network connected to the other communication network by the second line A selection device and a connection determination device provided in a first line connection network which is a different communication network connected to the communication network via a first line, wherein the route selection device selects, from a user device in the communication network And transmits the connection request signal to the first line connection network when receiving the transmitted connection request signal, and when the destination of the connection request signal is transmitted from the connection determination device to the user in the first line connection network When receiving the connection failure indicator is not a location, and transmits the connection request signal to the destination of the communication network via the second line.