Larry J. Greenstein Transporting voice traffic over packet networks. 227-234 1998 8 Int. Journal of Network Management 4 http://dx.doi.org/10.1002/(SICI)1099-1190(199807/08)8:4<227::AID-NEM290>3.0.CO;2-P db/journals/ijnm/ijnm8.html#Greenstein98