Steve, Excellent summary thus far!!! Will the summary stay on that url for a lengthy period of time, or would it be possible to copy it to the wiki when complete?
One item you might add to the T.38 discussion is a relatively short paragraph that describes/relates the current analog fax environment to T.38; by that I mean I don't have a clear picture in my mind as to whether T.38 has any interconnecting relationship to analog machines. Maybe some additional words that says something like... "T.38 capable fax machines encapsulate the digital fax bits into tcp/udp packets and sends those across a data network. To receive a T.38 data stream on an analog fax machine, the equivalent of a modem or protocol converter would be required to change the digital fax bits into an analog format compatible with the receiving analog fax machine's modem." Since there is a very high interest in the asterisk community to accomplish the T.37 approach (or stated slightly different, an interest in receiving faxes in a pdf or tiff form instead of paper), could you include a reference or two for products (open source or otherwise) that accomplishes that task? (I'm assuming spandsp is one such approach, and there are likely others. Something like... an analog fax modem when combined with the linux app called "xxx" will provide the economical conversion, but cannot be reliably used across voip.) The thought process (at least for me) is that many commercial voip/asterisk implementations really need the emergency Red Phone support (eg, US 911 fall back), and in many cases that analog pstn line could be the same as an incoming fax line. (Rather small price to pay to cover both legal liablilities and fax images in the current voip environment.) Back in the olden days, I recall several modem vendors bundling PC fax software with their products. All of those old Win v3.1 apps created a fax file (eg, pdf or otherwise) that could be distributed via email. What are the equivalent low-overhead approaches (sort of T.37) today? I'd be very happy if I could simply connect an old analog 28.8 modem to the asterisk serial port, and drop a low-overhead app onto the system to address the fax stuff for today. Something very basic. Rich ------------------------ > Hi, > > Questions keep comming up about this, so I started writing something at > http://www.soft-switch.org/foip.html . I think I covered the FAX over > VoIP issues fairly completely. T.37 is pretty simple to explain. There > is rather more to say about T.38, but at least this is a start. If > anyone wants to suggest corrections or additions, just blurt them out. > > Regards, > Steve > > > Rich Adamson wrote: > > >Steve Underwood, > > > >Would you mind summarizing where/how T.38 functions, and maybe how it > >compares to the analog fax environment for the asterisk-users arhives? > > > >Seems to be some misunderstanding, and a lot of interest in handling > >faxes in various forms via asterisk. If some these approaches were > >summarized in one posting, a lot of us could reference it to remind us > >of limitations, current state, etc. A few short paragraphs would be > >helpful. > > > >Rich > > > > > _______________________________________________ > Asterisk-Users mailing list > [email protected] > http://lists.digium.com/mailman/listinfo/asterisk-users > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users ---------------End of Original Message----------------- _______________________________________________ Asterisk-Users mailing list [email protected] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
