about the VOIP bandwidth

[nangergong <nangergong () gmail com>]

Hi, all:

  I'm using wireshark to capture VOIP streams, the Codec used in the VOIP
session is G711, which uses bandwidth of 64kbps.

  When I follow the following steps to analyse the VOIP streams:

  Telephony->RTP->show all streams->Analyze,

  I found that the IP BW (bandwidth) column shows that the bandwidth is
about 81.6 kbps.   I also used a traffic monitoring program to monitor the
traffic, which shows the bandwidth used is about 64kbps (conformant to G711
bit rate ). So, I wonder whether wireshark is accurate in measuring the
bandwidth? or even other metrics such as jitter,etc..

  Thank you!

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