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  \textbf{\Large{\textsc{STANFORD UNIVERSITY}}}\\[5pt]
  \textbf{\Large{\textsc{DEPARTMENT OF STATISTICS}}}\\[5pt]
  \Large{\textsc{DEPARTMENTAL SEMINAR}}
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\begin{center}
  4.15pm, Tuesday, July 3, 2007\\
  Sequoia Hall Room 200\\
  (Cookies at 3:45 in 1st Floor Lounge)
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\begin{center}
  \textsl{Bowei Xi} \\
  Department of Statistics\\
  Purdue University
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\begin{center}
  \subsection*{Voice Over the Internet }
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\noindent
The characteristics and performance of voice traffic over
the Internet (VoIP) are studied and modeled through the analysis
of VoIP data. VoIP packet traces are collected from two Internet
links. Call detail records are are available for one of the two
links. The accuracy and consistency of 
the data available are verified by the comparison of call detail
records and the packet trace measurements. Moreover,
the call arrival process, the statistical properties
of the aggregated voice traffic on the links, the detailed packet
dynamics of individual calls, packet jitter and delay, silence
suppression, and the bandwidth needed to satisfy quality of service
criteria are addressed in the talk.

This work is joint with Hui Chen, William S. Cleveland and
Thomas Telkamp.



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