Utilization of SIP Contact Header for Reducing the Load on Proxy Servers in FoIP Application

摘要

This paper focuses on the transmission of real-time fax in IP networks. Itpsilas been some time now that expressions like ldquoVoice over IPrdquo, ldquoFax over IPrdquo and the likes are heard extensively in the telecommunications industry. The idea is utilizing data networks to deliver telecommunications services which are presently provided by the PSTN. The incentive is pretty straightforward: cutting costs and yet being able to provide the previous services, not to mention the added capabilities to deliver a multitude of other services, hardly imagined feasible with the PSTN. In this paper, it is intend to closely examine some aspects of the new architecture and its implementation feasibility. Utilization of SIP in conjunction with SDP, as companion protocol to SIP for capabilities to exchange for fax transmission has been studied. This simulation scenario and its results exhibit the potential success of the proposed SIP/SDP combination for real-time fax session establishment, management and tear-down. Another important analysis carried out in this paper is the efficient link utilization of SIP proxy server sand SIP contact header for reducing the load in FoIP Application which is a highly desirable feature.