Re: [hylafax-users] [Fwd: facsimile not received]

[Lee Howard <faxguy@xxxxxxxxxxxxxxxx>]

Chris Jones wrote:

> Sep 15 15:55:38.43: [  990]: REMOTE wants 14400 bit/s
> Sep 15 15:55:38.43: [  990]: REMOTE wants page width 1728 pixels in 215 mm
> Sep 15 15:55:38.43: [  990]: REMOTE wants unlimited page length
> Sep 15 15:55:38.43: [  990]: REMOTE wants 3.85 line/mm
> Sep 15 15:55:38.43: [  990]: REMOTE wants 2-D MR
> Sep 15 15:55:38.43: [  990]: RECV training at v.17 14400 bit/s
> Sep 15 15:55:38.43: [  990]: MODEM set XON/XOFF/DRAIN: input ignored, output generated
> Sep 15 15:55:38.43: [  990]: <-- [11:AT+FRM=145\r]
> Sep 15 15:55:40.19: [  990]: --> [7:CONNECT]
> Sep 15 15:55:41.71: [  990]: MODEM set XON/XOFF/DRAIN: input ignored, output disabled
> Sep 15 15:55:41.71: [  990]: RECV: TCF 2730 bytes, 0% non-zero, 2702 zero-run
> Sep 15 15:55:41.71: [  990]: --> [10:NO CARRIER]
> Sep 15 15:55:41.71: [  990]: DELAY 75 ms
> Sep 15 15:55:41.79: [  990]: TRAINING succeeded
> Sep 15 15:55:41.79: [  990]: <-- [9:AT+FTH=3\r]
> Sep 15 15:55:41.86: [  990]: --> [7:CONNECT]
> Sep 15 15:55:41.86: [  990]: <-- HDLC<3:FF C8 21>
> Sep 15 15:55:42.51: [  990]: --> [10:NO CARRIER]
> Sep 15 15:55:42.51: [  990]: MODEM No carrier
> Sep 15 15:55:42.51: [  990]: MODEM input buffering enabled
> Sep 15 15:55:42.51: [  990]: MODEM set XON/XOFF/FLUSH: input ignored, output generated
> Sep 15 15:55:42.51: [  990]: <-- [11:AT+FRM=146\r]
> Sep 15 15:55:42.61: [  990]: --> [5:ERROR]
>  

The command-response interaction here between HylaFAX and the modem is 
interesting.  Notice that the AT+FTH=3 command response ends up being NO 
CARRIER instead of OK or ERROR.  The response is outside of T.31 spec, I 
think.  However, that indication is used by other digital modems that a 
disconnection occurred at that moment.  In fact, the ERROR response to 
AT+FRM=146 seems to confirm this conclusion.

So what it looks like from the log is that the caller sent TSI, DCS, and 
TCF... and then promptly hung up.  Now, that may not be what happened, 
but that's what the logs tell us.  The disconnection could, of course, 
be happening for other reasons, but the logs aren't going to tell us 
what.  Also, there could be a problem with the modem driver/firmware, 
and you'd have to consult with the manufacturer if that is the case.

I would suggest first checking with the caller to see if they know what 
happened.  If they intentionally disconnected (turned off the fax 
machine or pressed "stop"), then that's pretty clear.  But if they also 
are seeing an error, then it may have to do with phone lines, a PBX, or 
perhaps the modem itself that is causing the disconnection.

Lee.


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