hi,
I am just like yours a Satellite HUB operator that providing a voip.
Before i am providing a ptp h323 with g723 codec boxes ranging 2 to 4
port at 64kbps upstream and shared 2mbps downstream and now i come up to
put asterisk using a g723 and g729 of digium but not work for me because
when the remote end used data like email, browsing the voice suffer the
quality. I look back on my last experiment and i see that SER and
OPENSER is much better solutions to provide just a voice and voicemail
to call out. The 64kbps with Qos in the remote config will help a lot
better to provide a 99 % satisfaction to the customer.
//jollyr
Cosmin Prund wrote:
At my HQ I’m instaling a 128kbit leased line connection, with
guaranteed bandwidth to the Internet; The telco promises less then 20
ms to the internet (to ronix.ro), no jitter and no packet loss. So I’m
hoping for 40 ms times to net and small jitter J This is my „hub”.
For my „satelite” instalations I’m planning on grabing a connection
from a different provider (as this telco provider is expensive) but
I’m also considering a 64kbit leased line from the same provider, just
in case my VoIP doesn’t work with the cheeper providers. My remote
instalations will never have more then one „conversation” load, and
this conversation would be ZAP to IAX or SIP. That is, the distant
instalation will need to forward all calls coming in on the zap chanel
to my HQ Asterisk. That’s all it will ever do J. I’m not sure
„trunking” woud provide anything in this case as there will never be
more then one concurent conversation from the remote * to my HQ *. I’m
expecting IAX to provide better performance over SIP but not by much.
Considering my remote * instalations will never have more then one
concurent conversation with my HQ and considering I can get a really
good 64kbit line I guess I’m OK. As for my HQ, I’m sure I’m OK because
I’ll get a 128 kbit line and I’ll be able to afford an upgrade to
256kbit. I can actually go all the way to 2048 kbit, but that would no
longer be economically viable.
So I’ll see how it goes, and I hope I’ll have the time to put in a
comment on the „low bandwidth” wiki on voip-info.org.
Thanks to everyone for your help.
------------------------------------------------------------------------
*From:* [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] *On Behalf Of *tim panton
*Sent:* Thursday, February 02, 2006 11:05 AM
*To:* Asterisk Users Mailing List - Non-Commercial Discussion
*Subject:* Re: [Asterisk-Users] (newby) IAX Trunk on low bandwidth
connection
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]
<mailto:[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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From - Wed
--
Garth van Sittert
BSc (Physics & Computer Science)
-----------------
Mobile: +27 (0)83 791 6662
Email: [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
Phone: 08600 BITCO
Web: www.bitco.co.za <http://www.bitco.co.za>
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