Re: [asterisk-users] how to set iaxmodem receiving speed
Hi Steve, you are telling me there is no way to set a particular speed on my iaxmodem in order to force the sender speed? I have some problems with a customer who gets malformed faxes even if no error occurs. Since I cannot tell the sender to lower its fax speed, my idea is to force my iaxmodem to a lower fixed speed so the sender is oblidged to negotiate at that speed (or lower, of course) without the customer could realize it, at least at first. :) There is no ATA in the middle (I'm using it for my tests but my customer does not have any), all faxes are received thru a primary channel to a bunch of iaxmodems. Sometimes some faxes are corrupted, that's why I thought to lower the speed. I could try to disable ECM but that's even harder to do (found nothing on internet). Thank you Giorgio On 05/16/2012 07:24 PM, Steve Underwood wrote: Hi, On 05/16/2012 09:59 PM, Larry Moore wrote: Read the subject line more closely. Tested receiving too, I set the Send Receive speed of the receiving analogue modem to that below, the log file on the sending modem (iaxmodem) reported it capable of 9600. May 16 21:32:04.28: [ 2335]: REMOTE best rate 9600 bit/s May 16 21:32:04.28: [ 2335]: REMOTE max A3 page width (303 mm) May 16 21:32:04.28: [ 2335]: REMOTE max unlimited page length May 16 21:32:04.28: [ 2335]: REMOTE best vres R16 x 15.4 line/mm May 16 21:32:04.28: [ 2335]: REMOTE format support: MH, MR, MMR May 16 21:32:04.28: [ 2335]: REMOTE supports T.30 Annex A, 256-byte ECM May 16 21:32:04.28: [ 2335]: REMOTE best 0 ms/scanline May 16 21:32:04.28: [ 2335]: USE 9600 bit/s Perhaps the issue is with Hylafax. Setting the Transmit Receive strings to !24,48,72,96 seems to yield the most reliability in transmission If you have an ATA in the path that is often the case. Many of them badly mess up a FAX signal. Without such a distortion machine V.17 should be fine. Cheers, Larry. On 16/05/2012 7:23 PM, Larry Moore wrote: I have iaxmodem version 1.2.0 installed on my system. I have set the following in the IAX configuration file, SIGHUP'd FaxGetty and submitted a single page outbound fax via Asterisk; Class1RMQueryCmd: !24,48,72 # enable this to disable V.17 receiving Class1TMQueryCmd: !24,48,72 # enable this to disable V.17 sending The resulting output from my T.38 Gateway reports the following; -- Connection Statistics Bit Rate :7200 ECM : No Pages : 1 -- Hungup 'IAX2/iaxmodem0-11055' I also tested with the maximum speed set to 4800, the image was received however the responses to EOP timed out, I don't know if the is to do with my Asterisk T.38 gateway or my VoIP providers T.38 gateway. The result was the fax was retried for the defined number of attempts. Cheers, Larry. On 16/05/2012 6:28 PM, gincantalupo wrote: Hi all, I'm trying to lower my iaxmodem speed but still I haven't found any solution...I tried to add Class1RMQueryCmd: !24,48,72 to config.IAXtty but does not work...Hylafax says it it running at 9600 (sometimes at 14400) baud.. This is correct behaviour. The sending side has fine control over the modem modes it uses. The receiving side can only specify that V.27ter, or V.27ter+V.29 or V.27ter+V.29+V.17 are OK. So, if you allow the 7200bps mode of V.29 you are compelled to allows the 9600bps mode too. Steve -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] how to set iaxmodem receiving speed
On 17/05/2012 2:47 PM, gincantalupo wrote: Hi Steve, you are telling me there is no way to set a particular speed on my iaxmodem in order to force the sender speed? I have some problems with a customer who gets malformed faxes even if no error occurs. Since I cannot tell the sender to lower its fax speed, my idea is to force my iaxmodem to a lower fixed speed so the sender is oblidged to negotiate at that speed (or lower, of course) without the customer could realize it, at least at first. :) There is no ATA in the middle (I'm using it for my tests but my customer does not have any), all faxes are received thru a primary channel to a bunch of iaxmodems. Sometimes some faxes are corrupted, that's why I thought to lower the speed. I could try to disable ECM but that's even harder to do (found nothing on internet). Hi Giorgio, You may want to try these settings to set the most basic form of transmission on your receiving modems, I would however have thought, ECM being on would be better for you as it could then deal with lost frames. Class1MRSupport:no Class1MMRSupport: no Class1ECMSupport: no To set the ECM frame size to a lower value than the default of 64, you would set the following Class1PersistentECM:yes Class1ECMFrameSize: 64 Perhaps the corruption is occurring at the senders end before the data is pushed through the modem. Cheers, Larry. -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] how to set iaxmodem receiving speed
- Original Message - Hi Steve, you are telling me there is no way to set a particular speed on my iaxmodem in order to force the sender speed? I have some problems with a customer who gets malformed faxes even if no error occurs. Since I cannot tell the sender to lower its fax speed, my idea is to force my iaxmodem to a lower fixed speed so the sender is oblidged to negotiate at that speed (or lower, of course) without the customer could realize it, at least at first. :) There is no ATA in the middle (I'm using it for my tests but my customer does not have any), all faxes are received thru a primary channel to a bunch of iaxmodems. Sometimes some faxes are corrupted, that's why I thought to lower the speed. I could try to disable ECM but that's even harder to do (found nothing on internet). You're getting corrupted fax data and want to solve that problem by *disabling* ECM? That seems counter-intuitive to me... How are your fax calls coming into your system (PSTN-???-Asterisk-IAXmodem-Hylafax)? If you have VoIP somewhere in the call path, you'll likely keep bashing your head on the table trying to fix problems that will never go away. Also, don't be afraid to recognize sometimes your side (as the receiver) is working perfectly well, and sometimes there just isn't anything you can do about senders on bad lines/sending over VoIP/etc. The quality of a fax session is only as good as the weakest link contained within that session, including the call path from sender to receiver. --Tim -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] how to set iaxmodem receiving speed
On 05/17/2012 02:47 PM, gincantalupo wrote: Hi Steve, you are telling me there is no way to set a particular speed on my iaxmodem in order to force the sender speed? I have some problems with a customer who gets malformed faxes even if no error occurs. Since I cannot tell the sender to lower its fax speed, my idea is to force my iaxmodem to a lower fixed speed so the sender is oblidged to negotiate at that speed (or lower, of course) without the customer could realize it, at least at first. :) There is no ATA in the middle (I'm using it for my tests but my customer does not have any), all faxes are received thru a primary channel to a bunch of iaxmodems. Sometimes some faxes are corrupted, that's why I thought to lower the speed. I could try to disable ECM but that's even harder to do (found nothing on internet). You have a broken installation, and your response is to try to break it even more. Does that make sense? Steve -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] how to set iaxmodem receiving speed
Hi guys, thanks for answers. That could seem counter-intuitive but it is not. Not to mention the fact that information technology is not science, the solution to broken faxes is to lower down speed. This works even with normal telco lines even if you DO NOT have a pbx (telco technicians even say not to make faxes pass thru your PBX). I could ask my customer's telco to lower the speed down but it depends on the guy working at the call-center...sometime you talk to dummy people who ARE sure it is impossible. But it is not. So, I do not want to spend days to convince people working at that telco call-center that what I'm asking is feasible and I do not want to tell my customer to tell their customer to lower their faxes speed (before installing our PBX they were able to send perfect faxes so, why should they?). My idea was to tell iaxmodem not to accept fast speed rates so the fax machine on the other side should be forced to negotiate a slower speed as if my customer fax weren't virtual as iaxmodem is but a real one. I suspect that the problem is about the primary lines because I tested iaxmodem many times on my LAN and it is (surprisingly :) ) working fine (10 good received faxes out of 10 sent!!!) but, as you may know, talking to telco technician is a nightmarethey always say problems are always on the PBX side... :( Moreover, after sending a fax, the fax machine beeps correctly as the fax was correctly sent without corruption. :o I hope I have made my point but I'll try do dig deeper inside the problem as you suggested me. Thank you. :) Giorgio On 05/17/2012 04:02 PM, Tim Nelson wrote: - Original Message - - Original Message - Hi Steve, you are telling me there is no way to set a particular speed on my iaxmodem in order to force the sender speed? I have some problems with a customer who gets malformed faxes even if no error occurs. Since I cannot tell the sender to lower its fax speed, my idea is to force my iaxmodem to a lower fixed speed so the sender is oblidged to negotiate at that speed (or lower, of course) without the customer could realize it, at least at first. :) There is no ATA in the middle (I'm using it for my tests but my customer does not have any), all faxes are received thru a primary channel to a bunch of iaxmodems. Sometimes some faxes are corrupted, that's why I thought to lower the speed. I could try to disable ECM but that's even harder to do (found nothing on internet). You're getting corrupted fax data and want to solve that problem by *disabling* ECM? That seems counter-intuitive to me... How are your fax calls coming into your system (PSTN-???-Asterisk-IAXmodem-Hylafax)? If you have VoIP somewhere in the call path, you'll likely keep bashing your head on the table trying to fix problems that will never go away. Also, don't be afraid to recognize sometimes your side (as the receiver) is working perfectly well, and sometimes there just isn't anything you can do about senders on bad lines/sending over VoIP/etc. The quality of a fax session is only as good as the weakest link contained within that session, including the call path from sender to receiver. Also, while there are some brilliant experienced people here on the Asterisk lists, you may have better luck and traction by heading over to the iaxmodem and hylafax mailing lists. Or, at least you may get a different audience with different ideas/experience. --Tim -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] how to set iaxmodem receiving speed
On 17 May 2012 22:40, gincantalupo gincantal...@fgasoftware.com wrote: That could seem counter-intuitive but it is not. Not to mention the fact that information technology is not science, the solution to broken faxes is to lower down speed. This works even with normal telco lines even if you DO NOT have a pbx (telco technicians even say not to make faxes pass thru your PBX). I could ask my customer's telco to lower the speed down but it depends on the guy working at the call-center...sometime you talk to dummy people who ARE sure it is impossible. But it is not. So, I do not want to spend days to convince people working at that telco call-center that what I'm asking is feasible and I do not want to tell my customer to tell their customer to lower their faxes speed (before installing our PBX they were able to send perfect faxes so, why should they?). My idea was to tell iaxmodem not to accept fast speed rates so the fax machine on the other side should be forced to negotiate a slower speed as if my customer fax weren't virtual as iaxmodem is but a real one. I suspect that the problem is about the primary lines because I tested iaxmodem many times on my LAN and it is (surprisingly :) ) working fine (10 good received faxes out of 10 sent!!!) but, as you may know, talking to telco technician is a nightmarethey always say problems are always on the PBX side... :( Moreover, after sending a fax, the fax machine beeps correctly as the fax was correctly sent without corruption. :o And as a matching data point, we use ActiveFax for sending (interfaced from an ERP package) and often get Comm Error 283 and incomplete faxes. If it's just making a bad situation worse, how is it that our solution of turning off ECM mode fixes it 98% of the time? I'm curious. (We know it's fixed as often we're the receiver, and we can see the correct fax come through.) Sometimes we lower the speed too (to 9600) but often simply disabling ECM is the solution. Regards, Andrew -- Linux supports the notion of a command line or a shell for the same reason that only children read books with only pictures in them. Language, be it English or something else, is the only tool flexible enough to accomplish a sufficiently broad range of tasks. -- Bill Garrett -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] how to set iaxmodem receiving speed
On 05/17/2012 07:40 AM, gincantalupo wrote: That could seem counter-intuitive but it is not. Not to mention the fact that information technology is not science, the solution to broken faxes is to lower down speed. The DSP algorithms change slightly between bitrates and considerably between modulations. Changing the modulation/demodulation algorithms can many times avoid problems caused by some type of line audio disturbance. This is why fax machines and fax applications are programmed to try various bitrates and modulations when training is failing at the default settings. Because historically most fax machines have supported V.17 14400 bps as a default it became customary for support technicians to suggest slowing it down to 9600 bps. (I think that the real intent here was to switch to V.29 9600 bps, but in practice it often results in V.17 9600 bps.) The purpose in this isn't really so that the communication takes longer (you can imagine that stretching-out data over a longer period would increase the likelihood of some audio disturbance affecting the demodulation), but instead I believe that the purpose in this recommendation is to cause a change in the DSP algorithms. Now, disabling ECM (error correction) is just plain wrong as long as the ECM protocol is implemented properly on both ends. If ECM protocol is implemented properly on both ends (and most are implemented well-enough that this applies to them) then ECM should be left enabled. By disabling a well-implemented ECM feature you're essentially making the claim that the remote-side ECM protocol is broken. If disabling ECM actually makes things work and you never get a corrupted fax image come through after that then it only means that one or both of the endpoints had faulty ECM protocol. Some technicians (including those working for fax machine manufacturers) will recommend disabling ECM if faxes aren't getting through. While this may have originated with the purpose of avoiding problems in faulty ECM protocol I think that any regular use of this suggestion is simply to get the customer to go away. The customer will see a page come through with streaks and lines, but it will be successful, and so they'll unfortunately be happy with that enough to let the technician off-the-hook with the disable ECM advice instead of actually fixing the real problem (either getting the line audio quality problem corrected or fixing the broken ECM protocol). My idea was to tell iaxmodem not to accept fast speed rates so the fax machine on the other side should be forced to negotiate a slower speed And what you were doing with the HylaFAX modem config file for the iaxmodem should have worked to do this. Why it wasn't working can only be determined by investigating your installation. Thanks, Lee. -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] how to set iaxmodem receiving speed
On 05/17/2012 07:53 AM, Andrew Furey wrote: we use ActiveFax for sending (interfaced from an ERP package) and often get Comm Error 283 and incomplete faxes. If it's just making a bad situation worse, how is it that our solution of turning off ECM mode fixes it 98% of the time? I'm curious. Because apparently the ECM protocol in ActiveFax is broken. If disabling a feature that is designed to *improve* fax reliability and performance actually does the opposite, then there's no other explanation than to conclude that the implementation of that feature is broken in the product you're using. Thanks, Lee. -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] how to set iaxmodem receiving speed
- Original Message - Hi guys, thanks for answers. That could seem counter-intuitive but it is not. Not to mention the fact that information technology is not science, Huh? It is indeed very much a science. You have known established facts, processes, concepts, methods for testing and implementing those elements. the solution to broken faxes is to lower down speed. This works even with normal telco lines even *Sometimes* lowering speeds can help get faxes through, but you're missing the big picture. Fax is sensitive to latency, jitter, timing, interference, audio clipping, etc. Simply lowering your speed will not magically make all of those issues go away. You need to be looking at finding a solution to the root cause of the problem, not throwing some odd ideas at the symptoms. if you DO NOT have a pbx (telco technicians even say not to make faxes pass thru your PBX). I could ask my customer's telco to lower the speed down How would the telco lower the speed of your customer's fax gear? Unless they have direct control of it, or are providing some sort of T.38-T.30 service, the only way I can think of is they would have to introduce a problem on the line that would force the fax sender/receiver to force a lower speed during normal negotiation. Someone please correct me if I'm wrong? but it depends on the guy working at the call-center...sometime you talk to dummy people who ARE sure it is impossible. But it is not. So, I do not want to spend days to convince people working at that telco call-center that what I'm asking is feasible and I do not want to tell my customer to tell their customer to lower their faxes speed (before installing our PBX they were able to send perfect faxes so, why should they?). Again, your PBX/equipment/whatever can be 100% the best, most reliable system ever to be installed. BUT, if you have senders that are on poor lines, running over VoIP, or have a multitude of other issues, the problem lies with them. There is not much you can do to solve this. My idea was to tell iaxmodem not to accept fast speed rates so the fax machine on the other side should be forced to negotiate a slower speed as if my customer fax weren't virtual as iaxmodem is but a real one. I suspect that the problem is about the primary lines because I tested iaxmodem many times on my LAN and it is (surprisingly :) ) working fine Yes, performance *can* be good on an unloaded LAN. But again, it is fax over VoIP which means tomorrow it may not work because Jim Bob over in accounting is updating Windows, watching Youtube, downloading some music via Bittorrent, and backing up his machine to the fileserver. Point being, network performance is 100% responsible for your local IAXmodem experience over the LAN. :) (10 good received faxes out of 10 sent!!!) but, as you may know, talking to telco technician is a nightmarethey always say problems are always on the PBX side... :( I'm sure that is standard procedure. If you were in their shoes, would you want to deal with every possible PBX issue that comes around? I'm not saying it's right, just that's the way it is. Moreover, after sending a fax, the fax machine beeps correctly as the fax was correctly sent without corruption. :o No, the fax machine beeps to say the fax was *SENT*. Whether or not there was any corruption is entirely up to the sender/receiver to determine, typically with copy quality checking or ECM. I hope I have made my point but I'll try do dig deeper inside the problem as you suggested me. A point was indeed made. --Tim -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] how to set iaxmodem receiving speed
- Original Message - On 05/17/2012 07:53 AM, Andrew Furey wrote: we use ActiveFax for sending (interfaced from an ERP package) and often get Comm Error 283 and incomplete faxes. If it's just making a bad situation worse, how is it that our solution of turning off ECM mode fixes it 98% of the time? I'm curious. Because apparently the ECM protocol in ActiveFax is broken. If disabling a feature that is designed to *improve* fax reliability and performance actually does the opposite, then there's no other explanation than to conclude that the implementation of that feature is broken in the product you're using. I was about to write a response to this, you nailed it on the head. :) --Tim -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
[asterisk-users] how to set iaxmodem receiving speed
Hi all, I'm trying to lower my iaxmodem speed but still I haven't found any solution...I tried to add Class1RMQueryCmd: !24,48,72 to config.IAXtty but does not work...Hylafax says it it running at 9600 (sometimes at 14400) baud.. Any ideas? Thank you. Giorgio -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] how to set iaxmodem receiving speed
I have iaxmodem version 1.2.0 installed on my system. I have set the following in the IAX configuration file, SIGHUP'd FaxGetty and submitted a single page outbound fax via Asterisk; Class1RMQueryCmd: !24,48,72 # enable this to disable V.17 receiving Class1TMQueryCmd: !24,48,72 # enable this to disable V.17 sending The resulting output from my T.38 Gateway reports the following; -- Connection Statistics Bit Rate :7200 ECM : No Pages : 1 -- Hungup 'IAX2/iaxmodem0-11055' I also tested with the maximum speed set to 4800, the image was received however the responses to EOP timed out, I don't know if the is to do with my Asterisk T.38 gateway or my VoIP providers T.38 gateway. The result was the fax was retried for the defined number of attempts. Cheers, Larry. On 16/05/2012 6:28 PM, gincantalupo wrote: Hi all, I'm trying to lower my iaxmodem speed but still I haven't found any solution...I tried to add Class1RMQueryCmd: !24,48,72 to config.IAXtty but does not work...Hylafax says it it running at 9600 (sometimes at 14400) baud.. Any ideas? Thank you. Giorgio -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] how to set iaxmodem receiving speed
Read the subject line more closely. Tested receiving too, I set the Send Receive speed of the receiving analogue modem to that below, the log file on the sending modem (iaxmodem) reported it capable of 9600. May 16 21:32:04.28: [ 2335]: REMOTE best rate 9600 bit/s May 16 21:32:04.28: [ 2335]: REMOTE max A3 page width (303 mm) May 16 21:32:04.28: [ 2335]: REMOTE max unlimited page length May 16 21:32:04.28: [ 2335]: REMOTE best vres R16 x 15.4 line/mm May 16 21:32:04.28: [ 2335]: REMOTE format support: MH, MR, MMR May 16 21:32:04.28: [ 2335]: REMOTE supports T.30 Annex A, 256-byte ECM May 16 21:32:04.28: [ 2335]: REMOTE best 0 ms/scanline May 16 21:32:04.28: [ 2335]: USE 9600 bit/s Perhaps the issue is with Hylafax. Setting the Transmit Receive strings to !24,48,72,96 seems to yield the most reliability in transmission Cheers, Larry. On 16/05/2012 7:23 PM, Larry Moore wrote: I have iaxmodem version 1.2.0 installed on my system. I have set the following in the IAX configuration file, SIGHUP'd FaxGetty and submitted a single page outbound fax via Asterisk; Class1RMQueryCmd: !24,48,72 # enable this to disable V.17 receiving Class1TMQueryCmd: !24,48,72 # enable this to disable V.17 sending The resulting output from my T.38 Gateway reports the following; -- Connection Statistics Bit Rate :7200 ECM : No Pages : 1 -- Hungup 'IAX2/iaxmodem0-11055' I also tested with the maximum speed set to 4800, the image was received however the responses to EOP timed out, I don't know if the is to do with my Asterisk T.38 gateway or my VoIP providers T.38 gateway. The result was the fax was retried for the defined number of attempts. Cheers, Larry. On 16/05/2012 6:28 PM, gincantalupo wrote: Hi all, I'm trying to lower my iaxmodem speed but still I haven't found any solution...I tried to add Class1RMQueryCmd: !24,48,72 to config.IAXtty but does not work...Hylafax says it it running at 9600 (sometimes at 14400) baud.. Any ideas? Thank you. Giorgio -- _ -- Bandwidth and Colocation Provided byhttp://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] how to set iaxmodem receiving speed
Hi Larry, thank you for your answer. This is same test I did. After this I lowered again to 4800...result: iaxmodem receives at 9600 b/s.that's why I cannot solve the puzzle. I put that line (Class1RMQueryCmd: !24,48,72) in config.IAXtty and tried other configuration files too but I always get faxes at 9600. Thank you Giorgio On 05/16/2012 03:59 PM, Larry Moore wrote: Read the subject line more closely. Tested receiving too, I set the Send Receive speed of the receiving analogue modem to that below, the log file on the sending modem (iaxmodem) reported it capable of 9600. May 16 21:32:04.28: [ 2335]: REMOTE best rate 9600 bit/s May 16 21:32:04.28: [ 2335]: REMOTE max A3 page width (303 mm) May 16 21:32:04.28: [ 2335]: REMOTE max unlimited page length May 16 21:32:04.28: [ 2335]: REMOTE best vres R16 x 15.4 line/mm May 16 21:32:04.28: [ 2335]: REMOTE format support: MH, MR, MMR May 16 21:32:04.28: [ 2335]: REMOTE supports T.30 Annex A, 256-byte ECM May 16 21:32:04.28: [ 2335]: REMOTE best 0 ms/scanline May 16 21:32:04.28: [ 2335]: USE 9600 bit/s Perhaps the issue is with Hylafax. Setting the Transmit Receive strings to !24,48,72,96 seems to yield the most reliability in transmission Cheers, Larry. On 16/05/2012 7:23 PM, Larry Moore wrote: I have iaxmodem version 1.2.0 installed on my system. I have set the following in the IAX configuration file, SIGHUP'd FaxGetty and submitted a single page outbound fax via Asterisk; Class1RMQueryCmd: !24,48,72 # enable this to disable V.17 receiving Class1TMQueryCmd: !24,48,72 # enable this to disable V.17 sending The resulting output from my T.38 Gateway reports the following; -- Connection Statistics Bit Rate :7200 ECM : No Pages : 1 -- Hungup 'IAX2/iaxmodem0-11055' I also tested with the maximum speed set to 4800, the image was received however the responses to EOP timed out, I don't know if the is to do with my Asterisk T.38 gateway or my VoIP providers T.38 gateway. The result was the fax was retried for the defined number of attempts. Cheers, Larry. On 16/05/2012 6:28 PM, gincantalupo wrote: Hi all, I'm trying to lower my iaxmodem speed but still I haven't found any solution...I tried to add Class1RMQueryCmd: !24,48,72 to config.IAXtty but does not work...Hylafax says it it running at 9600 (sometimes at 14400) baud.. Any ideas? Thank you. Giorgio -- _ -- Bandwidth and Colocation Provided byhttp://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users -- _ -- Bandwidth and Colocation Provided byhttp://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] how to set iaxmodem receiving speed
Hi Larry, I forgot to mention I tried to set ModemRate at 4800 as well but without success. Giorgio -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] how to set iaxmodem receiving speed
On 16-05-12 17:10, gincantalupo wrote: Hi Larry, thank you for your answer. This is same test I did. After this I lowered again to 4800...result: iaxmodem receives at 9600 b/s.that's why I cannot solve the puzzle. I put that line (Class1RMQueryCmd: !24,48,72) in config.IAXtty and tried other configuration files too but I always get faxes at 9600. Did you restart iaxmodem and hylafax after you made those changes? Regards, Patrick -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] how to set iaxmodem receiving speed
Hi Patrick, of course I did. Stopped hylafax, killed iaxmodem process, re-started iaxmodem then hylafax. Result: Time To Receive: 0:00:14 Signal Rate: 9600 bit/s Data Format: 2-D MMR Error Correct: Yes :( At the very beginning before starting every kind of test, inside my hylafax/config/iaxmodem I added: Class1RMQueryCmd: !24,48# V.17 fast-train recv doesn't work well Class1TMQueryCmd: !24,48# V.17 fast-train recv doesn't work well Giorgio On 05/16/2012 05:33 PM, Patrick Lists wrote: On 16-05-12 17:10, gincantalupo wrote: Hi Larry, thank you for your answer. This is same test I did. After this I lowered again to 4800...result: iaxmodem receives at 9600 b/s.that's why I cannot solve the puzzle. I put that line (Class1RMQueryCmd: !24,48,72) in config.IAXtty and tried other configuration files too but I always get faxes at 9600. Did you restart iaxmodem and hylafax after you made those changes? Regards, Patrick -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] how to set iaxmodem receiving speed
Hi, On 05/16/2012 09:59 PM, Larry Moore wrote: Read the subject line more closely. Tested receiving too, I set the Send Receive speed of the receiving analogue modem to that below, the log file on the sending modem (iaxmodem) reported it capable of 9600. May 16 21:32:04.28: [ 2335]: REMOTE best rate 9600 bit/s May 16 21:32:04.28: [ 2335]: REMOTE max A3 page width (303 mm) May 16 21:32:04.28: [ 2335]: REMOTE max unlimited page length May 16 21:32:04.28: [ 2335]: REMOTE best vres R16 x 15.4 line/mm May 16 21:32:04.28: [ 2335]: REMOTE format support: MH, MR, MMR May 16 21:32:04.28: [ 2335]: REMOTE supports T.30 Annex A, 256-byte ECM May 16 21:32:04.28: [ 2335]: REMOTE best 0 ms/scanline May 16 21:32:04.28: [ 2335]: USE 9600 bit/s Perhaps the issue is with Hylafax. Setting the Transmit Receive strings to !24,48,72,96 seems to yield the most reliability in transmission If you have an ATA in the path that is often the case. Many of them badly mess up a FAX signal. Without such a distortion machine V.17 should be fine. Cheers, Larry. On 16/05/2012 7:23 PM, Larry Moore wrote: I have iaxmodem version 1.2.0 installed on my system. I have set the following in the IAX configuration file, SIGHUP'd FaxGetty and submitted a single page outbound fax via Asterisk; Class1RMQueryCmd: !24,48,72 # enable this to disable V.17 receiving Class1TMQueryCmd: !24,48,72 # enable this to disable V.17 sending The resulting output from my T.38 Gateway reports the following; -- Connection Statistics Bit Rate :7200 ECM : No Pages : 1 -- Hungup 'IAX2/iaxmodem0-11055' I also tested with the maximum speed set to 4800, the image was received however the responses to EOP timed out, I don't know if the is to do with my Asterisk T.38 gateway or my VoIP providers T.38 gateway. The result was the fax was retried for the defined number of attempts. Cheers, Larry. On 16/05/2012 6:28 PM, gincantalupo wrote: Hi all, I'm trying to lower my iaxmodem speed but still I haven't found any solution...I tried to add Class1RMQueryCmd: !24,48,72 to config.IAXtty but does not work...Hylafax says it it running at 9600 (sometimes at 14400) baud.. This is correct behaviour. The sending side has fine control over the modem modes it uses. The receiving side can only specify that V.27ter, or V.27ter+V.29 or V.27ter+V.29+V.17 are OK. So, if you allow the 7200bps mode of V.29 you are compelled to allows the 9600bps mode too. Steve -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] how to set iaxmodem receiving speed
On 17/05/2012 1:24 AM, Steve Underwood wrote: Hi, On 05/16/2012 09:59 PM, Larry Moore wrote: Read the subject line more closely. Tested receiving too, I set the Send Receive speed of the receiving analogue modem to that below, the log file on the sending modem (iaxmodem) reported it capable of 9600. May 16 21:32:04.28: [ 2335]: REMOTE best rate 9600 bit/s May 16 21:32:04.28: [ 2335]: REMOTE max A3 page width (303 mm) May 16 21:32:04.28: [ 2335]: REMOTE max unlimited page length May 16 21:32:04.28: [ 2335]: REMOTE best vres R16 x 15.4 line/mm May 16 21:32:04.28: [ 2335]: REMOTE format support: MH, MR, MMR May 16 21:32:04.28: [ 2335]: REMOTE supports T.30 Annex A, 256-byte ECM May 16 21:32:04.28: [ 2335]: REMOTE best 0 ms/scanline May 16 21:32:04.28: [ 2335]: USE 9600 bit/s Perhaps the issue is with Hylafax. Setting the Transmit Receive strings to !24,48,72,96 seems to yield the most reliability in transmission If you have an ATA in the path that is often the case. Many of them badly mess up a FAX signal. Without such a distortion machine V.17 should be fine. The receiving analogue modem is directly connected to the PSTN network and was used to to determine if the reported issue could be reproduced on a non-iaxmodem. My outgoing connections were through an iaxmodem with T.38 gateway enabled and disabled, with most successful transmissions being when T.38 gateway was used. Larry. -- _ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
