[asterisk-users] Faxing with Asterisk & SpanDSP [Was Fax Problems with SpanDSP]
Steve Underwood wrote: ... > SpanDSP handles faxes within Asterisk, through the app_rxfax and > app_txfax applications. It handles faxes outside Asterisk when used with > iaxmodem (there is actually a copy inside the iaxmodem package). > > SpanDSP cannot be used by the standard distribution of Asterisk, as it > is GPL code. However, if you are using Asterisk within the restrictions > of the GPL you can add app_rxfax and app_txfax to Asterisk quite easily. > > Regards, > Steve Thanks Steve, I was a bit lazy when I posted that question sorry - I just got a bit excited. A quick google and looking around the voip-info.org site pointed me to some interesting pages. Could anyone who has experience confirm if: * this will work with an x100p card so I can have a single FXO line that can detect incoming faxes and/or voice calls and enable me to use it for outgoing voice and fax? Also, I read somewhere that Asterisk should "never" be used with fax. IIRC correctly it was by the moderator on the Trixbox forum discussion about the trial of OSLEC. Yes, here: http://www.trixbox.org/forums/trixbox-forums/open-discussion/need-people-echo-problems "I really don't know how many times I need to say this but you should never run faxes through Asterisk. It was not designed to handle it. -- Kerry Garrison trixbox Community Director" Is he right? The question that prompted this reply was about how to turn off echo cancellation for fax traffic. Is this achievable? Many thanks Alan -- The way out is open! http://www.theopensourcerer.com ___ --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] Faxing with Asterisk & SpanDSP [Was Fax Problems with SpanDSP]
On Wed, 31 Oct 2007, Alan Lord wrote: > Steve Underwood wrote: > ... >> SpanDSP handles faxes within Asterisk, through the app_rxfax and >> app_txfax applications. It handles faxes outside Asterisk when used with >> iaxmodem (there is actually a copy inside the iaxmodem package). >> >> SpanDSP cannot be used by the standard distribution of Asterisk, as it >> is GPL code. However, if you are using Asterisk within the restrictions >> of the GPL you can add app_rxfax and app_txfax to Asterisk quite easily. >> >> Regards, >> Steve > > Thanks Steve, > > I was a bit lazy when I posted that question sorry - I just got a bit > excited. A quick google and looking around the voip-info.org site > pointed me to some interesting pages. > > Could anyone who has experience confirm if: > > * this will work with an x100p card so I can have a single FXO line that > can detect incoming faxes and/or voice calls and enable me to use it for > outgoing voice and fax? I've used it in exactly this mode with TDM400 cards. It worked mostly OK. You might need to fiddle with the gains in the zapata.conf file. (although I now steer people away from this way of doing it and use a separate ATA if they have a real fax machine, or an external fax to email service) > Also, I read somewhere that Asterisk should "never" be used with fax. > IIRC correctly it was by the moderator on the Trixbox forum discussion > about the trial of OSLEC. Yes, here: > http://www.trixbox.org/forums/trixbox-forums/open-discussion/need-people-echo-problems > > "I really don't know how many times I need to say this but you should > never run faxes through Asterisk. It was not designed to handle it. > -- > Kerry Garrison > trixbox Community Director" > > Is he right? Dunno, but it works. FAX data is nothing special - however modems are very critical of jitter - you and me and tolerate a bit of packet loss, or the odd duplicate, etc. in an audio stream, a modem can't. (NO CARRIER :) So your asterisk box shouldn't have jitter internally, but if it's running cpu intensive applications, it might have, I guess... A lot of people have success with running iaxmodem - which is just spanDSP connected to some fancy code to understand AT commands, and they then plumb this into hylafax running on a separate server over ethernet.. I've tried ATAs over ethernet to send/receive faxes to real fax machines with good results too. (Make sure the codec is G711 though, as nothing else will work) Gordon ___ --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] Faxing with Asterisk & SpanDSP [Was Fax Problems with SpanDSP]
Steve Underwood wrote: > SpanDSP cannot be used by the standard distribution of Asterisk, as it > is GPL code. However, if you are using Asterisk within the restrictions > of the GPL you can add app_rxfax and app_txfax to Asterisk quite easily. > I was wondering how someone could modify Asterisk to be GPL compliant? ___ --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] Faxing with Asterisk & SpanDSP [Was Fax Problems with SpanDSP]
[EMAIL PROTECTED] wrote: > Steve Underwood wrote: > > SpanDSP cannot be used by the standard distribution of Asterisk, as it > > is GPL code. However, if you are using Asterisk within the restrictions > > of the GPL you can add app_rxfax and app_txfax to Asterisk quite easily. > > > > I was wondering how someone could modify Asterisk to be GPL compliant? It *is*. The issue is that since Asterisk is dual-licensed, GPL-only code cannot be included in the mainline asterisk source. SpanDSP is (to my knowledge) GPL-only and hence, cannot be included. -Dave ___ --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] Faxing with Asterisk & SpanDSP [Was Fax Problems with SpanDSP]
On Wednesday 31 October 2007 13:55:32 [EMAIL PROTECTED] wrote: > Steve Underwood wrote: > > SpanDSP cannot be used by the standard distribution of Asterisk, as it > > is GPL code. However, if you are using Asterisk within the restrictions > > of the GPL you can add app_rxfax and app_txfax to Asterisk quite easily. > > I was wondering how someone could modify Asterisk to be GPL compliant? Asterisk is already GPL compliant. The issue is that the code has exceptions to the GPL, to allow it to be linked to certain patented codecs, for example, without violating patent licenses or the GPL. SpanDSP, on the other hand, is not dual licensed, so you cannot run, for example, both G.729 and SpanDSP in the same binary (legally), since the pure GPL license of SpanDSP "pollutes" the Asterisk binary to require the same of the G.729 codec (which is not permissible until the patents on G.729 expire). -- Tilghman ___ --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
