asterisk users - Dec 2005 - FAX Problems - PRI, Adtran and ZetaFax

Greetings

    I've been banging my head against a wall for over a week about a problem
with faxing and asterisk. I have ZetaFax (a faxing application for Windows)
connected via modem to a channel bank. The fax request (incoming) comes in
thru the PRI, gets sent to the FXS port where the fax system is connected
and Asterisk picks up. No prob there. I call the number and I hear the
faxing tones. My problem is that, if I get a multi-page request, pages get
cut off (most of the time). Sometimes they get cut off during the middle of
the transmission, some earlier. None get past (I'd say) 70% of the full
document being transmitted. in my zapata.conf I have (for the FXS fax port):

signalling=fxo_ks
context=app-fax-out-test
adsi=no
callerid=""<3052545900>
callwaiting=no
echocancel=no
echocancelwhenbridged=no
faxdetect=both
group=10
rxgain=10.5
txgain=-5.0
accountcode=avi
channel=73


I have two 4-port T1 cards in this machine (dual xeon, 1 gig of RAM). Voice
calls are perfect. I was reported that, under the old system, everything
worked perfectly (also an asterisk system, albeit a very old one). Has
anyone hit a wall like this? Any help will be *REALLY* appreciated!


Jesus Mogollon
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I have almost exactly the same setup: PRI - > Atlas 550 -> FXS (Octal
card)
-> USR Total Control V34 -> Digiboard 16 port -> Zetafax 9. Works
flawlessly, except Zetafax is sometimes problematic tying up to certain fax
machines. Check your timing source on the Atlas, your timing source should
be set to the slot and port that your PRI is plugged into in the demark from
the PSTN. This is most certainly frame slips. 
 
Another thing you can try in the Zetafax configuration snap-in is under
Devices > Your Modem > Device Options > More is to turn down your max
baud
rate to 9600, make sure "Class 1" is checked, and use "Software
flow
control" this gives maximum compatibility at the expense of slower faxes. 
 
FWIW, I'm phasing out Zetafax inbound in favor of SpanDSP, you should give
it a shot it works pretty good in the latest version (0.0.2-pre21 I think)
out of a few thousand guys that send to me, I only have ~30 that definitely
have a problem. I hard-code those guys in my dialplan to relay the call to a
regular fax plugged into the octal card on the Adtran and everything's cool.

 
hth
 
-----Original Message-----
From: Jesus Mogollon [mailto:gocho26@gmail.com]
Sent: Wednesday, December 21, 2005 12:27 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: [Asterisk-Users] FAX Problems - PRI, Adtran and ZetaFax
 
Greetings

    I've been banging my head against a wall for over a week about a problem
with faxing and asterisk. I have ZetaFax (a faxing application for Windows)
connected via modem to a channel bank. The fax request (incoming) comes in
thru the PRI, gets sent to the FXS port where the fax system is connected
and Asterisk picks up. No prob there. I call the number and I hear the
faxing tones. My problem is that, if I get a multi-page request, pages get
cut off (most of the time). Sometimes they get cut off during the middle of
the transmission, some earlier. None get past (I'd say) 70% of the full
document being transmitted. in my zapata.conf I have (for the FXS fax port):

signalling=fxo_ks
context=app-fax-out-test
adsi=no
callerid=""<3052545900>
callwaiting=no
echocancel=no
echocancelwhenbridged=no
faxdetect=both
group=10
rxgain=10.5
txgain=-5.0
accountcode=avi
channel=73


I have two 4-port T1 cards in this machine (dual xeon, 1 gig of RAM). Voice
calls are perfect. I was reported that, under the old system, everything
worked perfectly (also an asterisk system, albeit a very old one). Has
anyone hit a wall like this? Any help will be *REALLY* appreciated!


Jesus Mogollon
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