![]() Spatial decision making problems are multi-facetted challenges. The choice of the most appropriate technology in this case was found to be rather insensitive to changes in the importance of each main criterion. Highest preference was given to the pure IP-PBX VOIP alternative based on the four main criteria ranked in the order of importance from high to low as follows: benefit, low cost, technical feasibility, and low risk. Under benefit criteria, intangible benefit subcriteria received priority that was higher than that of tangible benefit. The result of this research indicates that highest priority was given to “benefit criteria” rather than “low cost criteria”. The opinions were collected from the experts using the structured survey questionnaire. Analytic Hierarchy Process (AHP) is applied to investigate the priority of the established criteria and evaluate the preference of each alternative. In-depth interviews with experts were arranged in order to gather expert opinions for refining the criteria from those gathered from past researches and to screen the alternatives for final selection. Seven EGAT experts in telecommunication systems agreed to participate in this research. ![]() The aim of this research is to establish the criteria for selecting the most appropriate Voice over Internet Protocol (VoIP) technology using the Electricity Generating Authority of Thailand (EGAT) as the case study company.
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