Re: [asterisk-users] FAX reliability
Hi Steve, Steve Underwood wrote: In chan_dahdi.c there is now code that extends the buffering inside dadhi when a FAX is detected, and puts the buffering back to normal at the end. This isn't really a cure - its more of a bandaid. However, I expect it has the desired effect if they have put it into the trunk code. You need to enable this feature in chan_dahdi.conf. Very interestingly, many people who have problems sending from app_txfax or app_fax have no problem sending from iaxmodem + HylaFAX. It seems Asterisk can feed a zaptel/dahdi channel much more reliably when passing a signal through, than when generating on in an app. So are the chan_dahdi.c developments mentioned of any practical value to iaxmodem users? Thanks, Lee. ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] FAX reliability
Hi Lee, Lee Howard wrote: Hi Steve, Steve Underwood wrote: In chan_dahdi.c there is now code that extends the buffering inside dadhi when a FAX is detected, and puts the buffering back to normal at the end. This isn't really a cure - its more of a bandaid. However, I expect it has the desired effect if they have put it into the trunk code. You need to enable this feature in chan_dahdi.conf. Very interestingly, many people who have problems sending from app_txfax or app_fax have no problem sending from iaxmodem + HylaFAX. It seems Asterisk can feed a zaptel/dahdi channel much more reliably when passing a signal through, than when generating on in an app. So are the chan_dahdi.c developments mentioned of any practical value to iaxmodem users? That's a good question, and I have no idea about the answer. Some people who have had problems sending from app_txfax say iaxmodem + HylaFAX works OK on the same machine. This seems strange, as you might expect a problem in scheduling I/O would affect passthrough as well as applications. What I don't know is whether they just have a lot less trouble with iaxmodem, or they have no trouble at all. Do you get reports from people who say receive is stable, but transmit is not? Steve ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [asterisk-users] FAX reliability
Steve Underwood wrote: Hi Lee, Lee Howard wrote: Hi Steve, Steve Underwood wrote: In chan_dahdi.c there is now code that extends the buffering inside dadhi when a FAX is detected, and puts the buffering back to normal at the end. This isn't really a cure - its more of a bandaid. However, I expect it has the desired effect if they have put it into the trunk code. You need to enable this feature in chan_dahdi.conf. Very interestingly, many people who have problems sending from app_txfax or app_fax have no problem sending from iaxmodem + HylaFAX. It seems Asterisk can feed a zaptel/dahdi channel much more reliably when passing a signal through, than when generating on in an app. So are the chan_dahdi.c developments mentioned of any practical value to iaxmodem users? That's a good question, and I have no idea about the answer. Some people who have had problems sending from app_txfax say iaxmodem + HylaFAX works OK on the same machine. This seems strange, as you might expect a problem in scheduling I/O would affect passthrough as well as applications. What I don't know is whether they just have a lot less trouble with iaxmodem, or they have no trouble at all. Do you get reports from people who say receive is stable, but transmit is not? There have been a few reports of that situation, but all of them that I recall had to do with people who were trying to use VoIP for fax (HylaFAX and iaxmodem tend to be much more tolerant of the audio cut-outs caused by jitter than are other receivers). Otherwise, no, I don't have any of those situations that I can point out. I suppose that I'd need to make some recordings to say for certain whether audio cut-outs were occurring. However, what would really be nice would be to see some comments come from whatever developer at Digium made those chan_dahdi.c modifications. Thanks, Lee. ___ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [Asterisk-Users] * fax reliability between ISDN PRI and FXS ports
I plug my fax machine into a Grandstream ATA286 (No T.38). Works fine for me and has done for the last year. I can send and receive 40 page faxes without issue. The ATA286 is located on the same LAN as the Asterisk. Craig Andres Maduro [EMAIL PROTECTED] wrote: Hi, I am building for a customer an * solution that will use 2 Digium cards. 1 x TE110P (T1 ISDN PRI) 1 x TDM40B (4 analog ports, 2 for faxes, 2 for extensions) The system will be connected to the PSTN through the T1 ISDN PRI interface. All customer extensions will be SIP phones except 2 fax machines that will use the analog FXS ports on the TDM40B card. I have been investigating on this list and found that faxing is not reliable between Zaptel cards and that Digium does not support nor recommend fax over the TDMXXB interfaces. Is this true ? Will fax not be reliable enough for my customer ? Will it be better to use Audiocodes digital and analog gateway (ATA) with T.38 capabilities ? Thanks in advance, Andres Maduro ___ Asterisk-Users mailing list Asterisk-Users@lists.digium.com http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Re: [Asterisk-Users] * fax reliability between ISDN PRI and FXS ports
I am building for a customer an * solution that will use 2 Digium cards. 1 x TE110P (T1 ISDN PRI) 1 x TDM40B (4 analog ports, 2 for faxes, 2 for extensions) The system will be connected to the PSTN through the T1 ISDN PRI interface. All customer extensions will be SIP phones except 2 fax machines that will use the analog FXS ports on the TDM40B card. I have been investigating on this list and found that faxing is not reliable between Zaptel cards and that Digium does not support nor recommend fax over the TDMXXB interfaces. Is this true ? Will fax not be reliable enough for my customer ? True... the TDM card (or its drivers) has an issue with missed frames that seriously impacts its ability to handle _any_ modem-type calls. Will it be better to use Audiocodes digital and analog gateway (ATA) with T.38 capabilities ? A good ATA should work fine, but you should probably test it before exposing your customer to potential problems. Others have used ATA's with analog fax machines. ___ Asterisk-Users mailing list Asterisk-Users@lists.digium.com http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
