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

[Cosmin Prund]

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?)

 

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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--
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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