Re: [hylafax-users] general IAXmodem concepts

["Chris Weiss" <cweiss@xxxxxxxxx>]

how does t.38 fit into all this?

On 4/6/07, marthter <marthter@xxxxxxxx> wrote:
> Lee Howard wrote  on 04/05/2007 07:58 PM:
>
> > marthter wrote:
> >
> >> I guess my main question is, can I run just IAXmodem (without
> >> Asterisk) and let it be the client to my VOIP provider's IAX
> >> compatible server?
> >
> >
> > You can, but the chances of that working reliably well for you are not
> > in your favor.  Data will get lost in the jitter.
> >
> >> Then I'll understand which of these scenarios are possible or
> >> impossible:
> >>
> >> 1. My HylaFAX server runs IAXmodem, IAXmodem talks to VOIP provider's
> >> IAX compatible server to place fax calls to PSTN
> >
> > It's possible, but again, it's not likely to work well.
>
> yeah, I guess my scenario 1 and my "main question" above (HylaFAX
> implied), were basically the same.
>
>
> >> 2. My HylaFAX server talks to IAXmodem, which is running in my
> >> Asterisk server (possibly on same box), Asterisk server talks to VOIP
> >> provider's IAX compatible server to place fax calls to PSTN
> >
> >
> > Again, this is possible, but since the audio runs over a lossy/jittery
> > channel it's not likely to work well.
> >
> >> 3. My HylaFAX server talks to IAXmodem, which is running in my
> >> Asterisk server (possibly on same box), Asterisk server uses one of
> >> its FXOs connected to one of my analog lines to place fax calls to PSTN
> >
> >
> > This is what should work very well.
> >
> >> I understand the caveats about faxing over VOIP (at least in as much
> >> as one can understand the caveats without understanding the above! ).
> >
> >
> >
> > It sounds like you may understand them but apparently you don't
> > believe them.
> >
> >  http://hylafax.sourceforge.net/docs/fax-over-voip.pdf
> >
> No I believe them too, I just couldn't understand why people would be
> talking about IAXmodem if the problems were insurmountable.  I figured
> why would you bother throwing Asterisk into the mix, if it wasn't saving
> you the phone and long distance charges of the analogue lines.
>
> Anyway, thanks.  I've read that PDF (and many of your other posts on the
> subject - been reading the list for 3 or 4 years now).
>
> So from what you're saying (if I'm getting it : - ), IAXmodem it is not
> being talked about and used because it lets you use HylaFAX on VOIP, it
> is just being talked about and used because it is another option for a
> local fax modem using local analogue lines.
>
> (Or on bigger-scale Asterisk, I guess that could be "another option for
> local fax modem using whatever upstream phone network interface" T1, etc)
>
> Thanks for helping me get the picture.
>
> Regards.
>
> Martin
>
>
>
>
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