The Improvement of SBC for a Multipoint Conference in a Ubiquitous Environment

In a ubiquitous environment, a communication and computing service can be taken without the limitation of the time and space. A conference service is one among the techniques implemented basically and used widely for such environment. The multipoint conference in a ubiquitous environment would be operated mostly in the private network to give the effect of the firewall. In this paper, we introduce SBC method to solve the some problem of the multipoint conference operation in a firewall environment, propose an algorithm to improve the existing SBC method.