Title: Overload control in SIP signalling networks with redirect servers

Authors: Kiran Kumar Guduru; Usha Jayadevappa

Addresses: Mobile Protocols and Platforms, Samsung R&D Institute India, Samsung Electronics, Bangalore, Karnataka, India ' Department of Master of Computer Applications, RV College of Engineering, Bangalore, Karnataka, India

Abstract: Session Initiation Protocol (SIP) is the most popular IP-based application level signalling protocol used for managing multimedia sessions and chat sessions between two or more users. Expeditious growth in usage of smart phones spurred the usage of IP-based multimedia communications. Rapid growth in the usage of Internet Telephony is increasing the load on servers resulting in server overload. Overload control techniques for SIP servers were proposed and standardised; however, existing SIP signalling networks with redirect servers are not well equipped to handle overload conditions. This research work discusses the limitations of existing SIP overload control techniques when employing redirect servers and proposes a solution for controlling overload in downstream SIP servers when employing redirect servers. We propose an algorithm for controlling overload state and formulate the conditions for analysing the overload control parameters, based on queue lengths. Simulation studies revealed that retransmissions in the proposed system are reduced by 63.64% and that of throughput is increased by 27.39%. Call failure rate is reduced by 0.5%.

Keywords: SIP; session initiation protocol; SIP redirect servers; SIP overload control; SIP transactions; retransmissions.

DOI: 10.1504/IJWMC.2020.110185

International Journal of Wireless and Mobile Computing, 2020 Vol.19 No.2, pp.124 - 132

Received: 03 Sep 2018
Accepted: 25 Dec 2019
Published online: 08 Oct 2020 *

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