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

Thu, 02 Feb 2006 01:06:22 -0800


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: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] 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 <[EMAIL PROTECTED]> 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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--
Garth van Sittert
BSc (Physics & Computer Science)
-----------------
Mobile: +27 (0)83 791 6662
Email:  [EMAIL PROTECTED]
Phone:  08600 BITCO
Web:    www.bitco.co.za

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