I have a situation that has repeated itself a few times. Someone calls into Asterisk and is connected with a voice extension. At some point during the call, the log shows "chan_zap.c: DTMF digit: f on Zap/2-1". At this point, the call is redirected to receive a fax and the Asterisk voice extension is hung up. The users report that there were no noticable tones heard just before the cutover, so I'm not sure what's going on. Is there a way to disable detection of faxes after the voicecall is initiated? We're running a Digium card to convert our analog trunks if that makes any difference. Thanks! Paul
Maybe their fat jowls hit a few buttons on the keypad and sent the fax tone down the line and they didn't realize it? Bill -----Original Message----- From: asterisk-users-bounces@lists.digium.com [mailto:asterisk-users-bounces@lists.digium.com] On Behalf Of Paul A. Pringle Sent: Friday, June 23, 2006 2:51 PM To: asterisk-users@lists.digium.com Subject: [Asterisk-Users] Voice calls sent to fax extension I have a situation that has repeated itself a few times. Someone calls into Asterisk and is connected with a voice extension. At some point during the call, the log shows "chan_zap.c: DTMF digit: f on Zap/2-1". At this point, the call is redirected to receive a fax and the Asterisk voice extension is hung up. The users report that there were no noticable tones heard just before the cutover, so I'm not sure what's going on. Is there a way to disable detection of faxes after the voicecall is initiated? We're running a Digium card to convert our analog trunks if that makes any difference. Thanks! Paul _______________________________________________ --Bandwidth and Colocation provided by Easynews.com -- Asterisk-Users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Paul A. Pringle
2006-Jun-26 07:54 UTC
[Asterisk-Users] RE: Voice calls sent to fax extension
I thought it might be an inadvertent button press, but none of the keys (on my phone at least) are recognized by Asterisk as fax tones. This has happened to two different users getting calls from different people using different equipment. Does anyone else see this behavior occasionally? Paul -----Original Message----- Date: Fri, 23 Jun 2006 15:29:31 -0400 From: "Bill Gibbs" <bgibbs@edurotech.com> Subject: RE: [Asterisk-Users] Voice calls sent to fax extension To: "Asterisk Users Mailing List - Non-Commercial Discussion" <asterisk-users@lists.digium.com> Message-ID: <BC4D33685C413A478FEC8BE36C4B810012B06D@eduro1.eduro.local> Content-Type: text/plain; charset="us-ascii" Maybe their fat jowls hit a few buttons on the keypad and sent the fax tone down the line and they didn't realize it? Bill -----Original Message----- From: asterisk-users-bounces@lists.digium.com [mailto:asterisk-users-bounces@lists.digium.com] On Behalf Of Paul A. Pringle Sent: Friday, June 23, 2006 2:51 PM To: asterisk-users@lists.digium.com Subject: [Asterisk-Users] Voice calls sent to fax extension I have a situation that has repeated itself a few times. Someone calls into Asterisk and is connected with a voice extension. At some point during the call, the log shows "chan_zap.c: DTMF digit: f on Zap/2-1". At this point, the call is redirected to receive a fax and the Asterisk voice extension is hung up. The users report that there were no noticable tones heard just before the cutover, so I'm not sure what's going on. Is there a way to disable detection of faxes after the voicecall is initiated? We're running a Digium card to convert our analog trunks if that makes any difference. Thanks! Paul
Paul A. Pringle wrote:>I thought it might be an inadvertent button press, but none of the keys >(on my phone at least) are recognized by Asterisk as fax tones. This >has happened to two different users getting calls from different people >using different equipment. Does anyone else see this behavior >occasionally? >Yes, which is why I disable faxdetect entirely. My sister-in-law was constantly being detected as a fax machine several minutes into conversations with my wife. As funny as that may seem at first ... those two eventually make it a not-so-funny situation for me. The fax detection should, in theory, only be looking for CNG tones and should, in theory, only be looking for them during the first several seconds of a call. Analogue DTMF tones should not be detectable as CNG, in theory. Lee.
Colin Anderson
2006-Jun-26 08:28 UTC
[Asterisk-Users] RE: Voice calls sent to fax extension
yes. Wind whistling in a car, female voices at a particular pitch and volume, fax machine running in the background of a voice call with the speaker on. It happens. Whether this is a problem or not depends on your pain threshold. I get a couple reports a week, which means that it actually happens ten times a couple times a week, so twenty times a week, and I process ~20K calls a week, so it happens to me .1 % of the time. Is this a problem for me? Nah. Is it a problem for you? Maybe - what's your pain threshold? ps fwiw, this behavior will happen with any device that listens inline for a CNG tone, so it's not just an Asterisk thing -----Original Message----- From: Paul A. Pringle [mailto:papringle@sep.com] Sent: Monday, June 26, 2006 8:54 AM To: asterisk-users@lists.digium.com Subject: [Asterisk-Users] RE: Voice calls sent to fax extension I thought it might be an inadvertent button press, but none of the keys (on my phone at least) are recognized by Asterisk as fax tones. This has happened to two different users getting calls from different people using different equipment. Does anyone else see this behavior occasionally? Paul -----Original Message----- Date: Fri, 23 Jun 2006 15:29:31 -0400 From: "Bill Gibbs" <bgibbs@edurotech.com> Subject: RE: [Asterisk-Users] Voice calls sent to fax extension To: "Asterisk Users Mailing List - Non-Commercial Discussion" <asterisk-users@lists.digium.com> Message-ID: <BC4D33685C413A478FEC8BE36C4B810012B06D@eduro1.eduro.local> Content-Type: text/plain; charset="us-ascii" Maybe their fat jowls hit a few buttons on the keypad and sent the fax tone down the line and they didn't realize it? Bill -----Original Message----- From: asterisk-users-bounces@lists.digium.com [mailto:asterisk-users-bounces@lists.digium.com] On Behalf Of Paul A. Pringle Sent: Friday, June 23, 2006 2:51 PM To: asterisk-users@lists.digium.com Subject: [Asterisk-Users] Voice calls sent to fax extension I have a situation that has repeated itself a few times. Someone calls into Asterisk and is connected with a voice extension. At some point during the call, the log shows "chan_zap.c: DTMF digit: f on Zap/2-1". At this point, the call is redirected to receive a fax and the Asterisk voice extension is hung up. The users report that there were no noticable tones heard just before the cutover, so I'm not sure what's going on. Is there a way to disable detection of faxes after the voicecall is initiated? We're running a Digium card to convert our analog trunks if that makes any difference. Thanks! Paul _______________________________________________ --Bandwidth and Colocation provided by Easynews.com -- Asterisk-Users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
I also had an intermittent problem, on average one or two faxes a week, that were not recongnzed as a fax. Then I switched phone companies and have not had that problem since. It has been over 2 months. I addition, my echo problem has been practically eliminated and overall voice quality is better. I believe that it is because of better levels of RX gain for fax recognition, but don't know for sure. -----Original Message----- From: asterisk-users-bounces@lists.digium.com [mailto:asterisk-users-bounces@lists.digium.com]On Behalf Of Paul A. Pringle Sent: Monday, June 26, 2006 10:54 AM To: asterisk-users@lists.digium.com Subject: [Asterisk-Users] RE: Voice calls sent to fax extension I thought it might be an inadvertent button press, but none of the keys (on my phone at least) are recognized by Asterisk as fax tones. This has happened to two different users getting calls from different people using different equipment. Does anyone else see this behavior occasionally? Paul -----Original Message----- Date: Fri, 23 Jun 2006 15:29:31 -0400 From: "Bill Gibbs" <bgibbs@edurotech.com> Subject: RE: [Asterisk-Users] Voice calls sent to fax extension To: "Asterisk Users Mailing List - Non-Commercial Discussion" <asterisk-users@lists.digium.com> Message-ID: <BC4D33685C413A478FEC8BE36C4B810012B06D@eduro1.eduro.local> Content-Type: text/plain; charset="us-ascii" Maybe their fat jowls hit a few buttons on the keypad and sent the fax tone down the line and they didn't realize it? Bill -----Original Message----- From: asterisk-users-bounces@lists.digium.com [mailto:asterisk-users-bounces@lists.digium.com] On Behalf Of Paul A. Pringle Sent: Friday, June 23, 2006 2:51 PM To: asterisk-users@lists.digium.com Subject: [Asterisk-Users] Voice calls sent to fax extension I have a situation that has repeated itself a few times. Someone calls into Asterisk and is connected with a voice extension. At some point during the call, the log shows "chan_zap.c: DTMF digit: f on Zap/2-1". At this point, the call is redirected to receive a fax and the Asterisk voice extension is hung up. The users report that there were no noticable tones heard just before the cutover, so I'm not sure what's going on. Is there a way to disable detection of faxes after the voicecall is initiated? We're running a Digium card to convert our analog trunks if that makes any difference. Thanks! Paul _______________________________________________ --Bandwidth and Colocation provided by Easynews.com -- Asterisk-Users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Colin Anderson
2006-Jun-26 08:39 UTC
[Asterisk-Users] RE: Voice calls sent to fax extension
>Yes, which is why I disable faxdetect entirely. My sister-in-law was >constantly being detected as a fax machine several minutes into >conversations with my wife. As funny as that may seem at first ... >those two eventually make it a not-so-funny situation for me.lol, Spousal Acceptance Factor, I have found, is the cornerstone of any Asterisk feature. Seriously, if I have a great idea and I am going to introduce it to my users, I put it on my Asterisk box at home and let my wife use it. If she says: "That doesn't suck" then I am golden with my users. Note that she doesn't say: "Wow thats a great feature" she simply says: "That doesn't suck" which to her is high praise.