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A comparative study of in-band and out-of-band VOIP protocols in layer 3 and layer 2.5 environments (2010)
Thesis
Pallis, G. A comparative study of in-band and out-of-band VOIP protocols in layer 3 and layer 2.5 environments. (Thesis). Edinburgh Napier University. http://researchrepository.napier.ac.uk/id/eprint/4005

For more than a century the classic circuit-switched telephony in the form of PSTN (Public Service Telephone Network) has dominated the world of phone communications (Varshney et al., 2002). The alternative solution of VoIP (Voice over Internet Proto... Read More about A comparative study of in-band and out-of-band VOIP protocols in layer 3 and layer 2.5 environments.