Patent ID: 7558249
Filing Date: 2009-07-07
Classification: H04L

Abstract:
1. A communication terminal, which is present on a private network connected to a global network via a router and which performs a one-to-one interconnection with a communication terminal on another network via the router, comprising: an address information determination section for examining a relay characteristic of the router by transmitting and receiving a predetermined message to and from a server which is on the global network and for, based on an examination result, determining address information about the router, which address information is to be used for the one-to-one interconnection with the communication terminal on said another network; an address information exchange section for exchanging, with the communication terminal on said another network, the address information about the router which has been determined by the address information determination section; a communication control section for, based on the address information about the router which has been exchanged by the address information exchange section, performing the one-to-one interconnection with the communication terminal on said another network; and a communication section for performing all communications for the communication terminal, wherein when the relay characteristic of the router is Port Reuse, the address information determination section determines address information, which contains at least a port number of the communication terminal, which port number is to be used for the one-to-one interconnection with the communication terminal on said another network, to be the address information about the router.