[Asterisk-Users] Actual audio bitrates

[Eric Wieling]

Check the mailing list.  There are several messages addressing the
issue.  The main cause of the extra bandwidth usage is IP and UDP
headers.  VoIP sends small packets and so, many times, the headers are
actually much larger than the data part of the packet.  IAX2 trunking
helps with the IP overhead, but only when you are sending more than 2 or
so calls between the same Asterisk servers.
-Eric

On Fri, 2003-10-10 at 11:53, Tais M. Hansen wrote:
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> Hi,
> 
> I was just measuring the bitrates of a couple of codecs via iax. I'm getting 
> much higher numbers than expected, so maybe I'm doing something wrong?
> 
> Measured with iptraf, values displayed are:
> codec: measured bitrate (bitrate according codec definition)
> 
> gsm: 52 kbps (13 kpbs)
> alaw: 154 kbps (?)
> speex: 57 kpbs (24 kpbs)
> 
> Seems a little high to me?
> 
> - -- 
> Regards,
> Tais M. Hansen
> ComX Networks
> Tel: +45-70257474
> Fax: +45-70257374
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-- 
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