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Mohd Nazri Ismail and Asaad Abusin, 2006. Prepaid and Postpaid VoIP Service Enhancements and Hybrid Network Performance Measurement. Information Technology Journal, 5: 386-400.
DOI: 10.3923/itj.2006.386.400
URL: https://scialert.net/abstract/?doi=itj.2006.386.400
DOI: 10.3923/itj.2006.386.400
URL: https://scialert.net/abstract/?doi=itj.2006.386.400