Patent ID: 7751376
Filing Date: 2010-07-06
Classification: H04W

Abstract:
1. A system for establishing a data transmission path between mobile phone terminals, the system comprising: a plurality of mobile phone base stations, each of which is connected to a mobile phone network through one or more IP (internet protocol) networks, wherein a mobile phone base station among the plurality of mobile phone base stations functions as a source base station to receive a calling request from a mobile phone terminal as a calling terminal, another mobile phone base station among the plurality of mobile phone base stations functions as a destination base station to receive the calling request from the source base station and to transfer the calling request to another mobile phone terminal as a called terminal, and the calling request from the source base station reaches the destination base station going through the one or more IP networks and the mobile phone network; a judging unit to judge whether the source base station is connectable with the destination base station through one of the one or more IP networks by comparing a first identifier indicating an IP network among the one or more IP networks to couple the source base station with the mobile phone network with a second identifier indicating an IP network among the one or more IP networks to couple the destination base station with the mobile phone network in case where the called terminal responds to the calling request;