Re: about the VOIP bandwidth

[Anders Broman <a.broman () bredband net>]

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
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