[Asterisk-Users] T.38 Faxing

[Andy Kuo]

Hi,
 It sounds like Asterisk should handle T.38 fax (at least at very light
load). However, I am having troubles faxing through a Linksys PAP2 NA. It
doesn't seem to get through at all. Everything else (voice calls) works just
fine. I am using Asterisk Business Edition (ABE-A.1). I have faxdetect=both
in zapata.conf, and I wonder if there's anything else I'm missing. I know I
won't get 100% with fax over IP, but the success rate for fax on my Asterisk
box is just way too low (about 5%, I would say).
 Can you please tell me what ATA you are using? Could it be that the PAP2
doesn't support fax?
 Please advice.
Thank you.
AK


 On 9/28/05, Roger Schreiter <roger at planinternet.de> wrote:
>
> Carlos Alperin schrieb:
> > ...
> > Bank, and send all the faxes through that system, and forget to try
> anything
> > through Asterisk.
> >
> > We're already tired of the complainings from customers that never can
> send
> > faxes, or sometimes some pages.
>
>
> Wow, strong words!
>
> Since our experiences with asterisk are mainly positive,
> we won't forget faxing through asterisk.
>
> As long as asterisk is just used as pbx or switch, it is
> obviously capable of transporting 100 and more faxes
> simultaniously without problems.
>
> The only thing missing seems to be a reliable modulator/
> demodulator and T.30 machine.
>
> rxfax/txfax+spandsp is still far away from being reliable under
> high load, but developing. Our experience is, that it does
> a very good job when sending or receiving single faxes.
> As soon as three or more faxes are processed at once,
> problems do occour.
>
> We are currently testing a commercial fax library with the goal,
> to implement an IAX client as fax server, in order the send or
> receive some dozen faxes simultaniously. It is too early to
> say, if we'll succeed, but we hope so, and thus won't forget
> faxing through asterisk.
>
> This is _no_ announcement of a product, since we currently
> won't have the right to distribute the library, but we think,
> it would be very interesting to know, whether it works or not.
> Those, looking for a GNU licenced tool will have to wait for
> progresses of spandsp anyway.
>
>
> By the way, the producer of the library announces T.38 support in
> some weeks. asterisk just started to support T.38 pass through,
> and probably will do it reliably in some weeks. Maybe this will
> enable T.38 support for asterisk - though unfortunately not for free nor
> open source.
>
>
> Roger.
>
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