Wireshark-users: [Wireshark-users] about the VOIP bandwidth

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From: nangergong <nangergong@xxxxxxxxx>
Date: Sun, 30 Jan 2011 19:12:55 +0000
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!