Re: about the VOIP bandwidth

[Jaap Keuter <jaap.keuter () xs4all nl>]

On Sun, 30 Jan 2011 22:21:56 +0100, Anders Broman wrote: 

>
nangergong skrev 2011-01-30 20:12: 
> > 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!
> The codec data inside
the RTP is 64Kbit/s with RTP/UDP/IP/Ethernet headers the rate should be
something like 96Kb/s, if memory serves.
> /Anders

It all depends on
the protocol layer you look at. This site [1] lets you have a good
insight in what's involved here. 

Thanks,
Jaap

Links:
------
[1]
http://www.bandcalc.com/

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