I probably should take this off list, BUT, some people may not be aware of how much better Asterisk is these days!
Asterisk USED to rely on interrupt-driven timing, which was - when you had a real timing source - super reliable. However, when you DIDN'T have timing, you had to fudge it, and there were a bunch of extremely fudge-y methods used, and it was awful, and people hated it. However, Linux now has timerfd, which is an EXTREMELY accurate timing source, and you can tell it to wake up a select(2) call every period - 20msec in VoIPs case. This actually ends up being MORE accurate than interrupt driven hardware (well, sort of) because you'll never (except you can) miss a tick, and you'll never slip on audio - which breaks fax. With all those caveats and sort-ofs aside, I feel confident that I'll be able to push a 56k connection from a random ATA through Kamailio, then Freeswitch/Asterisk into a PRI and then into something that talks 56k, to then establish a PPP or SLIP connection over it and connect to the internet! The only potential thing is that I doubt VERY much that it'll work over G722 - G722 is a really REALLY good codec for voice, but I'm almost certain i'll be useless for data. > PS. you have to much time on your hands. Shh. People will give me more stuff to do! 8) --Rob On Fri, 20 Sep 2019 at 10:01, Matt Perkins <m...@spectrum.com.au> wrote: > > Ours all went to scrap years ago. I wonder if I have a copy of the old > tftp image that it loads off. Not sure I even remember the name for it. > PS. you have to much time on your hands. > PSS what are you going to use for an E1 as Asterisk and a zap card ? I > very much doubt v34 will make it through Asterisk intact Fax barely > does. Almost all trellis QAM modulated signals I think would fall on > their ass your going to need something with a master clock like a real > pabx. > > Matt > > > On 20/9/19 9:00 am, Rob Thomas wrote: > > I was reminiscing on derpbook, and realised that it would be a > > RIDICULOUSLY insane idea to try to recreate a 56k dialup ISP in 2020. > > So I'm going to do it. > > > > To further this plan, I'm hoping that someone has some old Bay > > 5000/5399's lying around that they paid megabucks for and are now > > worth less than nothing, that they want to donate to a good home. > > > > If one happens to be in Brisbane, that would be even better, because > > I'm heading down there for Comicon this weekend, and I could pick it > > up then! > > > > If not, maybe some old Cisco devices? Or whatever those TNT devices > > were? Something that takes a PRI in one end and makes modem sounds at > > it, basically. > > > > --Rob > > _______________________________________________ > > AusNOG mailing list > > AusNOG@lists.ausnog.net > > http://lists.ausnog.net/mailman/listinfo/ausnog > > > -- > /* Matt Perkins > Direct 02 8916 8101 Spectrum Networks Ptd. Ltd. > Office 1300 133 299 m...@spectrum.com.au > Level 6, 350 George Street Sydney 2000 > Spectrum Networks is a member of the Communications Alliance & TIO > */ > > _______________________________________________ > AusNOG mailing list > AusNOG@lists.ausnog.net > http://lists.ausnog.net/mailman/listinfo/ausnog _______________________________________________ AusNOG mailing list AusNOG@lists.ausnog.net http://lists.ausnog.net/mailman/listinfo/ausnog