On Fri, 19 Sep 2003, WipeOut . wrote:

> > I wonder how IAX compares to SIP bandwidth-wise? I've tried both over
> > overseas IP connection, and somehow SIP seemed to work better.
> > 
> > Peter
> > 
> 
> Then try making two or three or more calls at the same time.. :)
> 
> If you setup IAX in trunk mode it uses the same connection for multiple voice 
> streams and so optimises the bandwith usage by reducing the overhead per voice 
> channel.. SIP can't do that..
> 
> Also IAX does not care about NAT so a situation like..
> AST<-->NAT<-->Internet<-->NAT<-->AST
> ..will work fine.. SIP will have problems in a setup like this without the use of 
> specialised NAT routers..
> 

FYI: trunking only works in IAX2 and it requires you to have a zaptel
interface on both endpoints

James

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