Patent ID: 6078583
Filing Date: 2000-06-20
Classification: H04L,H04M

Abstract:
A communication system comprising:an internet;a plurality of communication terminals which are to be connected to said internet through a public network; anda plurality of connection management servers installed at nodes between said public network and said internet and transit points within said internet in order to relay and manage the communication between said communication terminals, each of said connection management servers including:means for receiving a request of connection to a internet from one of said communication terminals, and a telephone number of communication terminal, and for assigning an IP address to said communication terminal;a mapping table in which said IP address and said telephone number of said communication terminal are registered in pair;a routing table in which routing information is registered in association with each of a plurality of telephone numbers managed by a connection management server;means for receiving from one of said communication terminals a request of communication with another communication terminal, and a telephone number of said another communication terminal as a called-side terminal;means for determining a communication route to said called-side communication terminal on the basis of said routing information; andmeans for transferring said communication request and said telephone number through said communication route,wherein when said connection management server is a server to be connected through said public network to a called-side one of said communication terminals, said connection management server further including:means for deciding if said called-side communication terminal is connected to said internet by examining said mapping table to detect the presence or absence of said telephone number of said called-side communication terminal received together with said communication request from a calling-side communication terminal;when said called-side communication terminal is connected to said internet, said transferring means transfers said communication request to said called-side communication terminal; andmeans for receiving from said calling-side communication terminal a communication end notice for said internet and deleting said IP address that is assigned to said calling-side communication terminal and registered in said mapping table.