See: http://bugs.digium.com/view.php?id=5090
Jorge Andy Kuo wrote: > Hi, > > I tried to connect two T.38 capable SIP ATA's through Asterisk. > I had canreinvite=yes and the 2 ATA's did talk directly to each other, > but fax still failed. > > >From Ethereal captures, I think the problem was when the originating > ATA is ready to set up a T.38 session, it sends a message to the > destination ATA to get ready for receiving T.38 packets. > Unfortunately, Asterisk did not pass that message to the destination, > so even though the actual T.38 packets did go directly to the > destination, the destination ATA doesn't know it needs to switch to > T.38 mode. > > What I am wondering is, if I can somehow configure the ATA's to be > locked to T.38 only, no voice calls allowed, will it work? (since it > is ONLY for receiving T.38 packets, we don't care if Asterisk pass on > the message to the destination to switch to T.38) > > Any thoughts on whether this will work or this is just a crazy idea? > > Thanks. > Andy > > > > > On 2/21/06, Lee Howard <[EMAIL PROTECTED]> wrote: > >> Carey Mould wrote: >> >> >>> How can I get asterisk to work with faxes in my configuration? I have >>> a WAN with Asterisk at the centre and Mediatrix 1104 gateways at the >>> end nodes providing tone to legacy PBX's and fax machines. The >>> Asterisk is connected to the PSTN via a Digium single port t1. >>> >>> The end nodes are connected via frame-relay 128kbps links. I want to >>> use g.729 between the end nodes and the Asterisk box at the centre. >>> TheMediatrix box supports T38. In my reading I am not seeing where >>> asterisk supports T38. >>> >> I believe that currently Asterisk SVN supports T.38 pass-through to some >> extent. Others here would be able to comment on that more fully. >> However, what you're seeking is T.38 gateway support, and Asterisk does >> not support that at the present. I know that there is some intention >> with spandsp to get T.38 gateway support there (so Asterisk would >> eventually support T.38 gateway via Unicall), but I suspect that's a >> long way off for your present needs. Again, I'm not really the one to >> be able to comment on this in detail. >> >> I'm not sure if the OpenH323 project (which I know supports at least >> T.38 pass-through) supports T.38 gateway, but even if it did, getting >> OpenH323 and Asterisk to work together may be difficult at best. I'm >> not really the one to be able to comment on that in detail, either. >> >> So for the time being I would consider that Asterisk does not support >> the T.38 features that you need to make this work and that you look at a >> different approach to getting your faxing working. >> >> >>> 1) If a fax machine connected to the Meditrix box sends a fax to a >>> location on the PSTN (legacy fax machine) where is the T38 converted >>> back? >>> >> That's what a T.38 gateway does. Asterisk doesn't do it. >> >> >>> 2)Does Asterisk handle this? >>> >> No. Not yet anyway. >> >> >>> 3) How do I configure Asterisk to do this >>> >> You can't presently. >> >> >>> 4) What is the significance on the Digium web site where they have a >>> CYA on the T1 board not supporting faxes ? >>> >> You probably are referring to these support statements on virtually all >> of their products: "The current state of faxing is incomplete and will >> not be supported." >> >> Well, it pretty much means what it says. I don't think you'll get any >> significant degree of support from Digium if you run into trouble with >> faxing using their hardware. >> >> All of that said, can you push a fax call through an Asterisk PBX? >> Yes. Search the archives and you'll see it can be done. >> >> Lee. >> >> _______________________________________________ >> --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 >> >> > _______________________________________________ > --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 > _______________________________________________ --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
