[Asterisk-Users] (newby) IAX Trunk on low bandwidth connection

[tim panton]

On 2 Feb 2006, at 08:09, Cosmin Prund wrote:

> Brrghhh: Bandwidth calculation is really foggy for me:
>
>
>
> Using the calculator I’m getting about 23 kbps for both incoming  
> and outgoing. What does this mean: Is a 64kbit link used at 71%  
> capacity ((23+23):64) or is it used at only 35% (23:64)? Will this  
> vary over time (i.e: does the codec generate more then average data  
> at times? How about less then average?)

It depends on what sort of link you have. Most links are full duplex  
(leased lines etc) which would be 35%
but some radio based links are half duplex which would be 71%

So for a 64k link you will (just about) get 3 729 calls.
If all the calls between are between the same two servers, you can  
use IAX trunking, which would push
you up to 5 calls. (What that tells you is that for 729 and gsm, the  
headers are as big as the data).

You talk about satellite stations, if you are going for a hub and  
spoke, you should put the hub
on the highest bandwidth link.

>
>
> Thanks.
>
>
>
> From: asterisk-users-bounces at lists.digium.com [mailto:asterisk- 
> users-bounces at lists.digium.com] On Behalf Of Rob Lith
> Sent: Wednesday, February 01, 2006 11:40 PM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [Asterisk-Users] (newby) IAX Trunk on low bandwidth  
> connection
>
>
>
> What codec is that using. G.729 will give you 10 calls at best over  
> 256k unless you're trunking with IAX2? I don't know anyone using  
> lpc10...
>
> Remember a G.729 8k codec turns into 23.63 Kbps with all the  
> overheads...
>
> Regards
> Rob
>
> On 2/1/06, Garth van Sittert <garth at bitco.co.za> wrote:
>
> Hi Cosmin
>
> You should be able to get about 12 simultaneous calls on a 128k  
> line and
> about 28 on a 256k line according to asteriskguru's bandwidth  
> calculator
> http://www.asteriskguru.com/tools/bandwidth_calculator.php.
>
> Kind Regards
> Garth
>
> BitCo Data Communications
> http://www.bitco.co.za
>
> Cosmin Prund wrote:
> > Hello everyone, this is my first post to the list, so hello again.
> >
> > We're a small company in Romania and we're trying to set up a  
> really small
> > version of "call center". That is, we want to get a few land- 
> lines from our
> > telco in different countys and "bridge" all calls to our HQ, in  
> order to
> > make it cheeper for our clients to call us.
> >
> > Unfortunatelly there's no ISP in our area that can deliver a  
> broadband
> > connection for anything less then an arm and a leg, so we're  
> considering
> > runing an * <-> * connection using VoIP over a low bandwidth  
> connection
> > (we're considering 128kbit but we might be able to go to 256kbit).
> >
> > The bandwidth price is not a problem for our "satelite"  
> installations, we
> > cand get acceptably priced broadband (~256kbit) so the distant  
> *'s will have
> > propper connections.
> >
> > My question:
> >
> > Is 128kbit a wide enough connection for 1 simultaneous  
> conversation, using
> > IAX protocol with the comercial version of the g729 codec?
> >
> > I'm expecting this to be engough for more then 1 conversation  
> (after all a
> > single line analog connection is rated at 64kbit and I'm getting  
> double that
> > bandwidth)
> >
> > Cosmin Prund
> >
> >
> > _______________________________________________
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> > From - Wed
> >
>
> --
> Garth van Sittert
> BSc (Physics & Computer Science)
> -----------------
> Mobile: +27 (0)83 791 6662
> Email:  garth at bitco.co.za
> Phone:  08600 BITCO
> Web:    www.bitco.co.za
>
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>
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