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Dynamic Codec Selection Algorithm for VoIP

Authors:
Maja Sulovic
Darijo Raca
Mesud Hadzialic
Nasuf Hadziahmetovic

Keywords: dynamic codec selection; speech codec; packet delay; packet loss; MOS

Abstract:
This paper gives a proposal on algorithm for adaptive adjustment of VoIP sources transmission rate based on voice quality estimated at the receiver. This adjustment is achieved through the appropriate use of differing voice codecs, as changes in network conditions occur, in order to maintain an efficient utilization of the available resources. We propose a simple algotihm for dynamic selection of voice codec, depending on network conditions during the on-going voice session. Algorithm is embedded in the source code of the programming environment OPNET Modeler 14.5. Simulation results show that the proposed algorithm makes better use of the available bandwidth, achieving superior performance in comparison to the situation without implementation of algorithm for adaptive codec selection.

Pages: 74 to 79

Copyright: Copyright (c) IARIA, 2011

Publication date: April 17, 2011

Published in: conference

ISSN: 2308-3964

ISBN: 978-1-61208-127-4

Location: Budapest, Hungary

Dates: from April 17, 2011 to April 22, 2011