IP Telephony

Date Completed: May 2005

Project Description:
This project builds on the work that went to the implementation part of my B.S. thesis. It covers technologies such as: Session Initiation Protocol, DiffServ QoS Architecture, SIP Network Modules Development, and Network Simulation. I have written a research paper based on the outcomes of this project with the title: "Utilizing DiffServ and SIP Contact Header for Real-time Fax Traffic Engineering"

Abstract—This paper focuses on the transmission of real-time fax in IP networks. For this purpose, the best current practices, i.e., utilization of the Session Initiation Protocol (SIP) as the signaling protocol along with ITU-T T.38 recommendation, are adopted. Two traffic engineering measures: utilization of SIP contact header and DiffServ QoS architecture, are proposed to streamline the implementation of the real-time FoIP. Network simulation results show that the proposed architecture, compared to the “Best Effort” service, has much less transmission time and jitter, and packets received are in correct sequence. Moreover, SIP contact header reduces load on network’s specialized resources. Therefore, this layout is a viable alternative for traditional PSTN fax.

Please click here to download the full paper.

Please click here to download the PowerPoint presentation of the paper.

The paper was accepted and presented at:
18th Annual Canadian Conference on Electrical and Computer Engineering, CCECE05, May 1-4, 2005, Saskatoon Inn, Saskatoon, Saskatchewan, Canada Please click here to download the conference program.

J-Sim network simulator has been utilized in this project. Please click here to download the simulation files.
 

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