Performability Evaluation of Voice Services in Converged Networks

Almir Pereira Guimarães; Dênis da Silva Rodrigues; Bruno Costa e Silva Nogueira

doi:10.22456/2175-2745.94016

Authors

Almir Pereira Guimarães Federal University of Alagoas https://orcid.org/0000-0002-9242-3355
Dênis da Silva Rodrigues Federal University of Alagoas https://orcid.org/0000-0003-1093-8599
Bruno Costa e Silva Nogueira Federal University of Alagoas https://orcid.org/0000-0002-1628-2757

DOI:

https://doi.org/10.22456/2175-2745.94016

Keywords:

VoIP, MOS, Availability, Reliability Block Diagram, Stochastic Petri Nets

Abstract

In the last years, the transmission of voice services in converged networks has experienced a huge growth. However, there are still some questions considering the ability of these networks to deliver voice services with acceptable quality. In this paper, we applied analytical modeling and simulation to analyze the quality of voice services using a new index, called MOS a , which considers jointly the MOS index and the availability of the subjacent infrastructure. We consider the influence of different CODECs (G.711 and G.729), queuing policies (Priority Queuing and Custom Queuing), and the warm standby redundancy mechanism. Our goal is to analyze the quality of these services by taking into account overloading conditions in different architectures/scenarios. These scenarios were constructed using the modeling mechanisms Reliability Block Diagram and Stochastic Petri Nets in addition to a discrete event simulator. Experimental results indicate that the G.711 CODEC has a higher sensitivity both in terms of data traffic volume and allocated network resources in relation to the G.729 CODEC.

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