Homemade 300 Baud Modem from the 80s still works today! reddit / bbs ---------------------------------------------------------------------- bombero_kmn · 2023-12-15 16:16 This is so cool! Stuff like this makes me wish we still had copper wire running where I live. I suppose you could rig it to work with VoIP but it just doesn't have the same magic. ---------------------------------------------------------------------- JohnPolka · 2023-12-15 19:08 Rick H, the BBS user who created this modem, is using it over VOIP to connect to my BBS. So, it can be used over VOIP. On my end, I do have a copper landline coming in, so maybe that helps a little bit. \-JP ---------------------------------------------------------------------- leafleap · 2023-12-16 01:29 Wait, you can still dial in and connect over VOIP? I thought there was some kind of incompatibility that prevented that. ---------------------------------------------------------------------- JohnPolka · 2023-12-16 06:14 Yes, you can connect over VOIP. You may not always get the fastest baud rate, but it can be done. ---------------------------------------------------------------------- dmine45 · 2023-12-16 21:30 Yep, you can. You need a good VOIP line and an error correcting modem on both ends. But it does work about 90% of the time. ---------------------------------------------------------------------- UM-Underminer · 2023-12-16 23:43 It's one of those things that the feasibility is a very solid "it depends." You need a good quality provider, and need to use fairly uncompressed wideband codecs. At that point if your route is fairly stable without huge differences in packet delivery time then low baud rate connections tend to work. ---------------------------------------------------------------------- que_two · 2023-12-18 15:39 It /very/ much depends on your VoIP provider. If they use the g.711 codec, it should be good enough to do a 28.8 connection /if/ the network is perfect between endpoints. Most home providers use a compressed VoIP codec like g.729a or g.723 which don't give the full audible range the modem and usually compress the snot out of what is picked up (g.711u for example, uses about 32-64k/s, where g.723 uses about 4-6kb/s). Enterprise-grade providers usually allow you to select which codecs you use -- or at least request that it gets locked at g.711 so that modems and fax machines still work.