Development of IP PBX system : concept, design, and commercialization

Pao Yue-kong Library Electronic Theses Database

Development of IP PBX system : concept, design, and commercialization


Author: Lau, Lee Kuen Victor
Title: Development of IP PBX system : concept, design, and commercialization
Degree: Eng.D.
Year: 2014
Subject: Internet telephony.
Hong Kong Polytechnic University -- Dissertations
Department: Faculty of Engineering
Pages: xxxix, 263 pages : illustrations ; 30 cm
Language: English
InnoPac Record:
Abstract: This thesis describes a research project on designing and developing an IP PBX system from concept to product commercialization. The research has been carried out at Connection Electronics Limited (CEL) where the author serves as co-founder and the Technology Director. The thesis involves the two main IP PBX components: the IP phone and the call servers. With regard to the IP phone, we are interested in how to reduce the phone complexity in terms of number of hardware and software components. We propose a thin client approach by moving some of the components traditionally found inside an IP phone to the call server. As a result, we can reduce the material and development cost of the IP phone. The call server consists of a call processing server, an interactive voice response server, a multiparty conferencing server, and a voice mail server. The development of the telephony servers will be based on the open source telephony platform Asterisk. We focus on phone services creation techniques and propose a service architecture to support customizable and extendable application development. We also develop an overlay IP phone control protocol to integrate the IP phone control within the application programs. Finally, the thesis describes the design and implementation of a multiple protocols distributed VoIP server performance test platform. Based on this performance test platform, we can quantify the servers call handling capacity in term of busy hours call attempts (BHCA) and maximum number of concurrent calls sustained. Several design limitation of the call servers are identified and some corrective actions are performed to improve the overall performance.

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