Re: [iaxmodem-users] No inbound audio

[Guy, C. <cra...@ze...>]

I can confirm this does work where you can control jitter and packet loss.  It most definitely is not for everyone.

I am running 2 x asterisk / iaxmodem boxes load balanced behind an SBC with Level3 in the USA in production with paying customers.  During commissioning we tested it up to a design capacity of 120 concurrent PSTN originated fax calls (60 per server) with 100% success rate.  We have SLA guarantees in place for jitter, latency and packet loss with Level3.  Calls are carried on Level3 DID's over their private fibre and delivered to our equipment located a single network hop from their media gateways in NYC.  I expect we could probably go higher than 60 calls per server, however the limiting factor in this instance is our SBC which is handling the media streams (480 G711 streams at full spec as each call has 4 media streams from the perspective of the SBC) and would probably choke if we tried to increase it significantly.


Craig Guy
Direct  +61 8 9488 9586
Mobile  +61 417 966 086



-----Original Message-----
From: Lee Howard [mailto:fa...@ho...]
Sent: Thursday, 5 March 2009 15:19
To: Dmitry
Cc: iax...@li...
Subject: Re: [iaxmodem-users] No inbound audio

Dmitry wrote:
>
> > Chris Brunner wrote:
> >
> > > I'm currently trying to get IAXmodem working by testing it through a
> > VoIP provider.
> >
> > Bad idea.  http://hylafax.sourceforge.net/docs/fax-over-voip.pdf
> >
> *The idea of not so bad. I used 4 IaxModems about half a year and
> faxes worked perfectly: Ventafax (WIN) -> DialOut-Ez-> Sredird->
> Iaxmodem-> Asterisk-> SIP (G711) -> Provider-> PSTN
> Predominantly 14400 ECM. Everything depends on the provider ,on
> direction, etc. Nobody disputes, T38 is better, but it is not always
> possible, and cheap.*

You have a rather unique situation, then, where packet loss and jitter
are either controlled or coincidentally infrequent.  The problem is that
every inexperienced user will read your message and believe that they,
too, will have the same play out for them.  Unfortunately, the chances
of that being the case are rather rare.

So if you have a situation where your faxing over a VoIP service works
for you, then I'm pleased for your luck.  However, I caution everyone
reading from believing that the same will be true for their attempt.

Thanks,

Lee.


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