Improve Performance of RTP Relaying Sessions in IMS Transport Layer With LREProxy

The IP Multimedia Subsystem is an architectural network for delivering IP multimedia services and data. The IMS network has built on three layers which allows for the convergence of different access networks. Each layer in IMS is consisting of various elements and protocols that consequently process signaling or media flow to specific application service. While the Call Session Control Function (CSCF) is the main route decision of the IMS network, the most significant of resources are used by routing and delivering media flow in Transport data layer in IMS network. With raising of request for service in IMS, the usage of resource have been increased. The ingress and egress nodes in IMS network are critical points and could potentially being bottleneck because they have to transmit huge signaling and media packets from and to IMS network. In this paper, we focused on Transport data layer on Edge-Border IMS network to manage and optimize its resources. We propose a new model of proxy that is called Light-RTP-Engine-Proxy (LREProxy). Also we implement our proposed paper as new module for Kamailio, Open Source SIP Server. We demonstrate how to use this module, the usage of resources in IMS network especially Edge-Border and IMS-Transit network have been significantly decreased.