NDLI: Voice over IP performance monitoring

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Voice over IP performance monitoring

Content Provider	ACM Digital Library
Author	Cole, R. G. Rosenbluth, J. H.
Abstract	We describe a method for monitoring Voice over IP (VoIP) applications based upon a reduction of the ITU-T's E-Model to transport level, measurable quantities. In the process, 1) we identify the relevant transport level quantities, 2) we discuss the tradeoffs between placing the monitors within the VoIP gateways versus placement of the monitors within the transport path, and 3) we identify several areas where further work and consensus within the industry are required. We discover that the relevant transport level quantities are the delay, network packet loss and the decoder's de-jitter buffer packet loss. We find that an in-path monitor requires the definition of a reference de-jitter buffer implementation to estimate voice quality based upon observed transport measurements. Finally, we suggest that more studies are required, which evaluate the quality of various VoIP codecs in the presence of representative packet loss patterns.
Starting Page	9
Ending Page	24
Page Count	16
File Format	PDF
ISSN	01464833
DOI	10.1145/505666.505669
Journal	ACM SIGCOMM Computer Communication Review (CCRV)
Volume Number	31
Issue Number	2
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1993-07-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Computer Networks and Communications Software

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