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

Fri Feb 3 06:31:38 MST 2006

My remote 64kbit connection would only be used for VoIP and NOTHING else! No
email, no browsing. Besides, my remote 64kbit guaranteed-bandwidth
connection changed into a 256/512 ADSL connection from the same telco
provider (that's actualy waaaay cheeper then the other 64kbit guaranteed
connection)

> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-
> bounces at lists.digium.com] On Behalf Of Jolly M. Recto
> Sent: Friday, February 03, 2006 5:45 AM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [Asterisk-Users] (newby) IAX Trunk on low bandwidth
> connection
> 
> 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:* asterisk-users-bounces at lists.digium.com
> > [mailto:asterisk-users-bounces at lists.digium.com] *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:* 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
> > <mailto: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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> >>
> >> Asterisk-Users mailing list
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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 <mailto:garth at bitco.co.za>
> > Phone: 08600 BITCO
> > Web: www.bitco.co.za <http://www.bitco.co.za>
> >
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