A. ARJONA, C. WESTPHAL, A. YLA-JAASKI, M. KRISTENSSON and J. MANNER, "Towards High Quality VoIP in 3G Networks An Empirical Approach,"
International Journal of Communications, Network and System Sciences, Vol. 1 No. 4, 2008, pp. 350-361. doi:
10.4236/ijcns.2008.14043.