On SIP session setup delay modeling in next generation networks

With the increasing use of session initiation protocol (SIP) in large deployments and the fact that numerous conventional communication networks have been spread, it is profitably to build a next generation network (NGN) linking circuit and packet-switched networks. This paper is concerned with the quality-of-service (QoS) parameters estimation problem in NGN. We have proposed a mathematical model and developed an approximate method for computing QoS parameters. Furthermore, numerical analysis has demonstrated the accuracy of the model as well as the method.