Re: [hylafax-users] Faxes over 2 pages fail.

[Lee Howard <faxguy@xxxxxxxxxxxxxxxx>]

Mark Ratering wrote:

> Jan 10 15:14:41.14: [15114]: ANSWER: FAX CONNECTION  DEVICE 
> '/dev/ttyIAX1'


Ah, an iaxmodem.  I know about this.  :-)

> Jan 10 15:15:29.23: [15114]: RECV received frame number 15
> Jan 10 15:15:29.45: [15114]: RECV received frame number 16
> Jan 10 15:15:29.45: [15114]: RECV frame FCS check failed
> Jan 10 15:15:29.45: [15114]: Bad HDLC terminating flag received.


(gobbledy-gook for 0.81+ seconds... ~1024 bytes lost)

This is due to some error, disruption in the audio.  Possibly not your 
fault.  ECM should correct this, after triggering a PPR.

> Jan 10 15:15:30.26: [15114]: HDLC frame not byte-oriented.  Trailing 
> byte: 0
> Jan 10 15:15:30.68: [15114]: RECV received frame number 21
> Jan 10 15:15:30.88: [15114]: RECV received frame number 22


Here's the PPR signal sent, and we expect to get frames 17 through 20 
resent to us...

> Jan 10 15:15:48.08: [15114]: RECV send PPR (partial page request)
> Jan 10 15:15:48.08: [15114]: <-- [10:AT+FRM=96\r]
> Jan 10 15:15:48.88: [15114]: --> [6:+FRH:3]
> Jan 10 15:15:54.46: [15114]: --> [7:CONNECT]
> Jan 10 15:15:54.46: [15114]: --> HDLC<9:FF C8 FD F2 80 00 F2 80 3C>
> Jan 10 15:15:54.46: [15114]: --> [2:OK]
> Jan 10 15:15:54.46: [15114]: RECV recv PPS (partial page signal)
> Jan 10 15:15:54.46: [15114]: RECV recv MPS (more pages, same document)
> Jan 10 15:15:54.46: [15114]: RECV received 80 frames of block 1 of page 2


But what happens is that after 0.80 seconds the modem claims to detect 
the V.21 carrier, but the HDLC frame is not received in it's entirety 
for 5.58 seconds more... so something seems fishy about that... 
especially since this same sequence repeats from here on out until the 
session fails.

I've included Steve Underwood on this thread.  If you're unaware, he 
authored the spandsp library that iaxmodem uses.

This issue is probably better-suited to be handled on the iaxmodem-users 
mailing list, and I've added it to this thread.  You should probably do 
hylafax-users a favor and remove it from any replies.

It appears to me that iaxmodem is mistakenly reporting a V.21 carrier at 
15:15:48.88 (with the +FRH:3 message) when it should be picking up the 
V.29 carrier instead.  The sender certainly seems to be insisting that 
it is doing things correctly.

So this is what I need you to do.  Go to:

 http://soft-switch.org/downloads/snapshots/spandsp/

and download the most recent spandsp snapshot.  Install it just like you 
did the spandsp that came with iaxmodem.  Then try again.  If it still 
has the same problems illustrated above then please add "record" to your 
/etc/iaxmodem-cfg.ttyIAX1 file and try again.  That will put two *.raw 
files in your /tmp/ directory.  Send those to me and also to Steve.

I assume that this problem doesn't occur with all senders.  (?)  I can 
send many, many page fax jobs to HylaFAX receiving with iaxmodem with no 
problems.  If it does happen with every single sender then it's possible 
that the problem is unique to your system.

Thanks,

Lee.


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