All the fax modems I have seen do send CNG tones, but I have seen some very old standalone fax machines that do not. They used to be quite common, but in the last few years I have only seen one fax machine that does not support CNG.
One workaround is to send the call to the fax machine on a timeout. Then a fax that does not send a CNG can sometimes still get through. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Eric Wieling Sent: Wednesday, March 10, 2004 12:14 PM To: [EMAIL PROTECTED] Subject: RE: [Asterisk-Users] Asterisk mangling faxes First of all Asterisk does not support ${VARIABLES} as part of the extension number. i.e. exten => ${BLAH},1,NoOp is not valid, but exten => 1234,1,NoOp(${BLAH}) is valid. Also Asterisk NEEDS the sending fax machine to send standard fax machine tones (CNG, I think) for it to be detected. When you send a fax the fax machine starts sending tones as soon as the call is dialed. Asterisk listens for these tones and if it hears them it will route the call to exten => fax,1,Blah if such an extension exists. As I understand it some (many?) fax modems do not send the required tone when making a fax call. On Wed, 2004-03-10 at 10:47, Jim Sneeringer wrote: > I'm having the same symptoms using X100P's, TDM400P's and WinFax, and have > and have had no luck correcting it. I don't have a standalone fax machine to > test with. > > Does anyone know if this a problem whenever faxes are sent and received with > a modem, or is it specifically WinFax? Is there any other way to accomplish > the goal of computer faxing with Asterisk? > > Jim > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Bisker, Scott > (7805) > Sent: Wednesday, March 10, 2004 8:50 AM > To: [EMAIL PROTECTED] > Subject: RE: [Asterisk-Users] Asterisk mangling faxes > > 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: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of michiel betel > Sent: Wednesday, March 10, 2004 9:40 AM > To: [EMAIL PROTECTED] > 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 > > > > > > > _______________________________________________ > Asterisk-Users mailing list > [EMAIL PROTECTED] > http://lists.digium.com/mailman/listinfo/asterisk-users > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users > _______________________________________________ > Asterisk-Users mailing list > [EMAIL PROTECTED] > http://lists.digium.com/mailman/listinfo/asterisk-users > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users > > > _______________________________________________ > Asterisk-Users mailing list > [EMAIL PROTECTED] > http://lists.digium.com/mailman/listinfo/asterisk-users > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users -- For Asterisk PBX related documentation go to http://www.digium.com/index.php?menu=documentation and look at the "Unofficial Links" section also see http://www.voip-info.org/wiki-Asterisk also see my site at http://www.fnords.org/~eric/asterisk/ BTEL Consulting _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
