Communication system

A communication system comprising:

• a line classification selection server which stores, for each of network classifications of a plurality of networks, network information including one or both of communication quality information and billing information of the network;
• and
• a session initiation protocol server provided for each of the plurality of networks;
• and
• a communication control server which communicates with the session initiation protocol server to provide a communication service to a user terminal,
• wherein
• the line classification selection server receives, from a communication device of a service provider, a service start request including service classification information, network condition information including a communication quality condition and/or a billing condition of a network to be used, and identification information of the user terminal,
• the line classification selection server refers to the network information based on the network condition information included in the service start request and selects a network classification satisfying the communication quality condition and/or the billing condition,
• the line classification selection server transmits a server start request including the service classification information, the identification information of the user terminal and selected network classification to the communication control server, and
• the communication control server receives the server start request, and communicates with the session initiation protocol server corresponding to the selected network classification, to perform communication control for providing the communication service corresponding to the service classification information to the user terminal corresponding to the identification information of the user terminal.

A communication system comprising:

• a line classification selection server which stores, for each of network classifications of a plurality of networks, network information including one or both of communication quality information and billing information of the network;
• and
• a video distribution server for distributing video data to user terminals,
• wherein
• the line classification selection server receives, from a communication device of a service provider, a service start request including video classification information, network condition information including a communication quality condition and/or a billing condition of a network to be used, and identification information of the user terminal,
• the line classification selection server refers to the network information based on the network condition information included in the service start request and selects a network classification satisfying the communication quality condition and/or the billing condition,
• the line classification selection server transmits a server start request including the video classification information, the identification information of the user terminal and selected network classification to the video distribution server, and
• the video distribution server receives the server start request, and distributes video data corresponding to the video classification information to the user terminal corresponding to the identification information of the user terminal through the network of the selected network classification.