[asterisk-users] SIP v IAX2

[Stephen Davies]

On 26/10/06, Guillermo Salas M. <gsalas at manta.telconet.net> wrote:
> What about the bandwidth used for both protocols? Is IAX using less or
> more bandwidth than SIP?

I'll give you an actual measured result.

A trunked IAX2 link, carrying 30 simultaneous calls using
variable-bit-rate Speex - we saw 7 kilobits / call / second. That's
INCLUDING all IAX2, UDP, IP overheads.

That's the magic of Speex VBR and trunking.

Its much much much less than you can do with SIP.  Better even than
any of the proprietary boxes with packet-saver technology and the like
when using a codec with quality comparable to Speex.

Steve