Bandwidth calculation

[Salvatore Frandina <salvatore.frandina () gmail com>]

Hi,

I'm using Wireshark to calculate the bandwidth of SIP based audioconference.
I use Wireshark 1.2.6 rev 31702 on Windows vista 32 bit sp2 with bria 2.4
softphone.
I have a question about the RTP statistics. Telephony->RTP->Show all
streams->analyze->save as CSV.

I have calculate the bandwidth histogram with MATLAB using the seventh
column of CSV file.

If in the conference all members use the same audio codec, I get correct
value as reported here
http://www.voip-info.org/wiki/view/Bandwidth+consumption.


If in the conference the members use different audio codec (like GSM, G.729
and G.711a/u) I get a mean bandwidth value about 80 kb/s due to G.711a/u
codec and a values (small percentage) up to 120 kb/s.

Is it normal? Where could be the problem?

Thank



-- 
_______________________________________
Salvatore Frandina
website: http://frandinas.altervista.org
mail: salvatore.frandina () gmail com

_______________________________________

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