End-to-end performance metrics analysis in IMS networks with different message types

A network built according to IMS architecture, consists of various nodes that consequentially process signaling messages transmitted during services providing. While IMS-network nodes process signaling messages, delays occur; this determines the quality of service. The duration of the delay has a probabilistic nature. In this paper, the author suggests an approximation of an IMS-node mathematical model that permits to evaluate characteristics of the network core. This research provides practical information about signaling traffic and sojourn time in a real IMS network, that could be used during current VoIP networks modernization and new networks design.