Re: Wireshark-users Digest, Vol 56, Issue 26 about the VOIP bandwidth

["COHEN, HARVEY S (ATTSI)" <hc2182 () att com>]

Wireshark is correct. 64 Kbps is the bandwidth of the G.711 payloads
inside the RTP packets.
81.6 Kbps is the bandwidth of the RTP packets themselves.

Harvey S. Cohen
AT&T Labs, Middletown, NJ
Mobile +1-908-768-5833
Office +1-732-420-4099

-----Original Message-----


Message: 12
Date: Sun, 30 Jan 2011 19:12:55 +0000
From: nangergong <nangergong () gmail com>
To: wireshark-users () wireshark org
Subject: [Wireshark-users] about the VOIP bandwidth
Message-ID:
        <AANLkTikoLJkWQN4KPPrEKs-NUVr_j=HWNqZhXWej7EZz () mail gmail com>
Content-Type: text/plain; charset="iso-8859-1"

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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