[Asterisk-Users] What is IAX Trunking?

[Deon Rodden]

Thanks,

I read that article. Seems like Trunking is a good thing, you said it really
helps at 4+ calls.  Does anybody have any reasons for not using Trunking?
Any disadvantages?


----- Original Message ----- 
From: "Andrew Yager" <andrew at rwts.com.au>
To: <asterisk-users at lists.digium.com>
Sent: Sunday, July 04, 2004 9:32 AM
Subject: Re: [Asterisk-Users] What is IAX Trunking?


> On 04/07/2004, at 11:24 PM, Deon Rodden wrote:
>
> > Sorry, I've been on voip-info.org but I still can't get a clear
> > definition
> > of what IAX trunking is. It says you need the timing from a zaptel
> > device
> > (or ztdummy or zaprtc) to make it work, but nothing specific about
> > what it
> > is or what it does. Maybe I'm looking in the wrong place.
>
> The best place to look is:
>
> http://www.voip-info.org/wiki-Asterisk+bandwidth+iax2
>
> But in a nutshell - IAX trunking allows multiple voice streams to share
> a single "trunk" to another server, reducing overhead created by IP
> packets.
>
> "This trunking eliminates the IP overhead found in individual VoIP IP
> streams by pipelining RTP data from multiple calls into single (larger)
> packets, thus removing the redundancy of IP overhead for each RTP
> stream and more closely allowing bandwidth scaling as a function of
> codec usage instead of a function of (codec usage + IP overhead.) Of
> course, this mode can only be used if all the calls are between two
> specific Asterisk servers, but this is frequently the case with
> toll-avoidance situations or between two branch offices where there is
> an Asterisk server at each location. "
>
> Andrew
>
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