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 lets you have a good insight in what's involved here.
Thanks,
Jaap
