asterisk users - Feb 2006 - (newby) IAX Trunk on low bandwidth connection

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

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@bitco.co.za
Phone:  08600 BITCO
Web:    www.bitco.co.za