[Asterisk-Users] TxFax -> RxFax on same machine hangs

Eckhard Rothfuchs er at kincos.de
Thu Aug 18 00:53:35 MST 2005


Am Mittwoch, 17. August 2005 17:06 schrieb Craig Guy:
> Hi Bartek, I posted the exact same problem last week - I found that if I
> connected two Asterisk systems together via a PRI crossover cable and talk
> txfax to rxfax then you get a T4 state timeout.  I tried connecting ports
> one and two together on a TE410p and also connecting a TE410p to a TE110p,
> and a TE110p to a TE110p on different machines.  I also found this when
> looping back via the PSTN.  I read up a bit on what T4 actually is, and it
> seems to be a pretty high level state, where the faxes are transferring or
> about to transfer the tiff image data between themselves.  The faxes will
> eventually hangup on each other - if you do a zap destroy channel to force
> hangup then you will sometimes get a segfault and asterisk will crash.
>
> I haven't found a solution for it, but it's not a big problem for me as I
> was only going txfax to rxfax as part of testing something else and I am
> using a hardfax attached to a SIP ata instead that works just fine against
> both rxfax and txfax.
>
> Craig
>
> ----- Original Message -----
> From: "Bartek Kania" <mrbk at gnarf.org>
> To: "Asterisk Users Mailing List - Non-Commercial Discussion"
> <asterisk-users at lists.digium.com>
> Sent: Wednesday, August 17, 2005 9:57 PM
> Subject: Re: [Asterisk-Users] TxFax -> RxFax on same machine hangs
>
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> >
> > On Wed, 17 Aug 2005, Steve Underwood wrote:
> >> Bartek Kania wrote:
> >>>> If the call really dialed out through a PSTN port and back in it
> >>>> should work.  It is was a pure internal connection between 2
> >>>> processes it will not. The timing for these programs comes from the
> >>>> received data. No data, no work.
> >>>
> >>> I can confirm that this problem appears on a call through the PSTN.
> >>> My setup is:
> >>> TxFax -> Asterisk -> E1 -> Asterisk (same box) ->RxFax
> >>> Asterisk version 1.0.9 and spandsp version 0.0.2pre18 on debian woody
> >>> (3.0).
> >>> I sent you an email about it with some debug information a week or so
> >>> ago.
> >>> If you need it again, or need some other info I'll be happy to provide
> >>> it.
> >>
> >> Did you put txfax in caller mode?
> >
> > Yes I did.
> > This is a snippet from 'show channel' for the two channels:
> >            Name: Zap/3-1
> >            Type: Zap
> >     ...
> >       Frames in: 5249
> >      Frames out: 265
> >  Time to Hangup: 0
> >    Elapsed Time: 0h1m45s
> >  ...
> >     Application: RxFAX
> >            Data: /tmp/1123753288.12.tif
> >           Stack: 1
> >     Blocking in: ast_waitfor_nandfds
> >
> > and
> >
> >            Name: Zap/28-1
> >            Type: Zap
> >     ...
> >       Frames in: 3123
> >      Frames out: 430
> >  Time to Hangup: 0
> >    Elapsed Time: 0h1m3s
> >  ...
> >     Application: TxFAX
> >            Data:
> > /usr/local/asterisk/var/spool/asterisk/faxspool//ff-psbj1x.tif|caller|deb
> >ug Stack: 0
> >     Blocking in: ast_waitfor_nandfds
> >
> > The console seems to indicate that the faxes start to communicate using
> > the slow modems, and then hang after switching to a fast modem.
> > Log is attached.
> >
> > /B
> > - --
> > * GPG-Key: http://evil.gnarf.org/mrbk.pgp
> >
> > A: Because we read from top to bottom, left to right.
> > Q: Why should i start my reply below the quoted text?
> > - -- http://www.i-hate-computers.demon.co.uk/
> >
> > -----BEGIN PGP SIGNATURE-----
> > Version: GnuPG v1.4.1 (GNU/Linux)
> >
> > iD8DBQFDA0I5ckvkFeO3ANARAjLJAJ0eXELd2WjzGOy59ptkFEE3kiUJcQCgxF9P
> > 3WgYpTG5b1BfA3yOVk3w9wc=
> > =lNab
> > -----END PGP SIGNATURE-----
>
> ---------------------------------------------------------------------------
>-----
>
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-- 
-----------------------------------------------------

Dipl. Ing. 
Eckhard   Rothfuchs

Felix-Klein-Str. 1a
37083     Göttingen

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