Eric Wieling wrote: >>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)
Good explanation. Stolen... :-)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.
http://www.voip-info.org/tiki-index.php?page=Bandwidth+consumption Updated.
/O
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