Hi list,
Faxes come in over an E1 line (on an TE410P) here and then are sent to
an analog fax machine attached to a T1 (also on the TE410P) &
channelbank (CAC1).
Problem is that almost all faxes we send out and receive are mangled...
either only halve pages or very stretched text etc.
Setup in extensions.conf is just:
exten => ${NN_FAX},1,Answer
exten => ${NN_FAX},2,Dial(Zap/49,80)
exten => ${NN_FAX},3,Hangup
echocancel is off for Zap/49 since the path is TDM only....
Any pointers to where to look??
Thanks, Michiel
Michiel,
Are you using WinFax? or one of the Products Based on Winfax? I've seen
this on all of our WinFax Stations, but none of our standalone Fax machines.
-sb
-----Original Message-----
From: asterisk-users-admin@lists.digium.com
[mailto:asterisk-users-admin@lists.digium.com]On Behalf Of michiel betel
Sent: Wednesday, March 10, 2004 9:40 AM
To: asterisk-users@lists.digium.com
Subject: [Asterisk-Users] Asterisk mangling faxes
Hi list,
Faxes come in over an E1 line (on an TE410P) here and then are sent to
an analog fax machine attached to a T1 (also on the TE410P) &
channelbank (CAC1).
Problem is that almost all faxes we send out and receive are mangled...
either only halve pages or very stretched text etc.
Setup in extensions.conf is just:
exten => ${NN_FAX},1,Answer
exten => ${NN_FAX},2,Dial(Zap/49,80)
exten => ${NN_FAX},3,Hangup
echocancel is off for Zap/49 since the path is TDM only....
Any pointers to where to look??
Thanks, Michiel
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On Wednesday, March 10, 2004 12:19 PM, Jim Sneeringer [SMTP:j@snee.us] wrote:> Darren, ><snip>> > Also, why should Asterisk introduce a lot of noise? (Faxes work finewithout> Asterisk or with the old phone system.) I'm using a 2.4GHz Pentium 4 > with two X100P's and two TDM400P's. Faxes are garbled even when thereis no> other load, and nothing else has changed except to replace the oldswitch> with Asterisk. I have tried attaching the fax to different cards andusing> different FXO lines, and faxes are always garbled, so I don't thinkit> is some kind of sample defect in the hardware. >I have a T400P card and one of the T1 ports is attached to a Zhone channel bank. I ran into some difficulty with faxes and after some trouble shooting found that a different channel bank (Adtran TA750) worked fine. (Maybe there was something introduced in the a/d conversion of the Zhone bank). I have phone lines off of this Zhone channel bank and phone conversations sound great, however faxes (and modems) seem less reliable. Modem connections connect but usually around 9600. With the Adtran bank connection speed were more line 21400.> What could I try that might reduce this noise?Sorry I can't really help here.> JimDon Pobanz
michiel betel wrote:> Hi list, > > Faxes come in over an E1 line (on an TE410P) here and then are sent > to an analog fax machine attached to a T1 (also on the TE410P) & > channelbank (CAC1). > Problem is that almost all faxes we send out and receive are > mangled... either only halve pages or very stretched text etc. > Setup in extensions.conf is just: > > exten => ${NN_FAX},1,Answer > exten => ${NN_FAX},2,Dial(Zap/49,80) > exten => ${NN_FAX},3,Hangup > > echocancel is off for Zap/49 since the path is TDM only.... > > Any pointers to where to look?? > > Thanks, Michiel > >We have done some more investigation as to where the actual signal degradation took place. Thus we connected out fax machine to an external (not Asterisk) Analog line. Faxing directly to this line worked perfectly, thus making sure the fault was not in the fax machine. We then setup a rule in asterisk to: exten => ${NN_FAX},1,Answer exten => ${NN_FAX},2,Dial(${TRUNK}/12345678,80) ;(where 12345678 is the number of the analog line) Thus immediately redirecting all traffic on this number to dial out over another E1 channel (on the same trunk) to the analog line. All faxes directed to NN_FAX now became mangled. Now for the weird part: The ${NN_FAX} came into the 3rd port of the TE410P, the 2nd one is connected to the CAC channel bank, the first port was originally connected to another E1, but now disconnected, showing RED alarm and its channels commented out in zaptel.conf. This setup worked fine for voice... When we reconfigured the Zap setup, having the active E1 coming in to the first E410P port (also changing the sync to sync on that port) our fax-mangling problems disappeared. Question now is, is my 4 port E1/T1 card faulty or did I run into a Zaptel driver problem which only happens if you don't use the first port of the TE410? Michiel