[asterisk-dev] Bug in SendFax/ReceiveFax ?

[Pavel Troller]

> 2009/9/14 H?kon Nessj?en <haakon at avelia.no>:
> > Hi,
> >
> > It seems like asterisk does not like to send faxes to itself:
> >
> > The cal is set up using a call file with Local/exten at context and
> > Application: SendFax()
> >
> > [Sep 14 14:53:53] WARNING[8817]: app_fax.c:439 transmit_audio: It looks like
> > we hung. Aborting.
> > [Sep 14 14:53:53] WARNING[8817]: app_fax.c:173 phase_e_handler: Error
> > transmitting fax. result=49: The call dropped prematurely.
> > [Sep 14 14:53:53] WARNING[8817]: app_fax.c:618 transmit: Transmission error
> > [Sep 14 14:53:53] WARNING[8818]: app_fax.c:173 phase_e_handler: Error
> > transmitting fax. result=49: The call dropped prematurely.
> > [Sep 14 14:53:53] WARNING[8818]: app_fax.c:618 transmit: Transmission error
> >
> > Fax sending/transmitting is working great going in or out via DAHDI, but
> > when i send a fax to a fax receiver at the same asterisk machine, it hangs,
> > and then gives up after some while, with the werror message shown.
> >
> > Can easily be reproduced by SendFax()ing to a ReceiveFax() on the same
> > server. (Tested on *1.6.0.5 with spandsp0.0.5, could someone test this on
> > trunk?)
> 
> I've previously set up a similar test, but used thousands of call
> files to 'burn-in' T.38 faxing between two asterisk systems. The faxes
> completed reliably thousands of times.
> 
> I never tried your arrangement with a LOCAL channel. There may be
> something interesting about LOCAL channel faxing that shouldn't be
> done. Perhaps faxing on loopback-style local channels is broken? If
> you do put it into the bugtracker, be sure to point out that it's
> LOCAL channel faxing that's not working for you.
> 
> For a workaround, you should either setup a loopback T1 cable with
> your card, or set up two systems to bounce calls at each other.
> 

Hi!
  I'm not running trunk, but I can confirm this bug for 1.6.1.6/spandsp 0.0.6.
    Regards, Pavel