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An Adaptive Codec Switching Scheme for SIP-Based VoIP

  • Ismet Aktas
  • Florian Schmidt
  • Elias Weingärtner
  • Cai-Julian Schnelke
  • Klaus Wehrle
Part of the Lecture Notes in Computer Science book series (LNCS, volume 7469)

Abstract

Contemporary Voice-Over-IP (VoIP) systems typically negotiate only one codec for the entire VoIP session life time. However, as different codecs perform differently well under certain network conditions like delay, jitter or packet loss, this can lead to a reduction of quality if those conditions change during the call. This paper makes two core contributions: First, we compare the speech quality of a set of standard VoIP codecs given different network conditions. Second, we propose an adaptive end-to-end based codec switching scheme that fully conforms to the SIP standard. Our evaluation with a real-world prototype based on Linphone shows that our codec switching scheme adapts well to changing network conditions, improving overall speech quality.

Keywords

VoIP communication Codec Switching SIP 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Ismet Aktas
    • 1
  • Florian Schmidt
    • 1
  • Elias Weingärtner
    • 1
  • Cai-Julian Schnelke
    • 1
  • Klaus Wehrle
    • 1
  1. 1.Chair of Communication and Distributed SystemsRWTH Aachen UniversityAachenGermany

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