Yes, faxing is done with T.38, and faxing is actually more reliable than using a modem. I spent some years running a fax system over VOIP and trying to get it t

Yes, faxing is done with T.38, and faxing is actually more reliable than using a modem. I spent some years running a fax system over VOIP and trying to get it to work. It's doable (as in some special cases of using a modem over VOIP lines) but it's absolutely not doable in most other contexts on VOIP for various reasons including signal compression and packet loss, and the parent is dreaming if they think they can hook their 14.4 modem up and dump that signal onto a "telephone" line to (for example) a BBS in another timezone and have it work. The key here is non-local, not the copper lines the parent commenter is still using to dial up a local ISP. This is obviously a special case of the telephone company local to their area maintaining the copper lines for whatever purposes, keeping the copper from their house to a local ISP gateway. But Comcast and Verizon have been actively ripping copper lines out wherever they buy up local phone companies that still have them. I have asked the phone companies for an actual copper landline in every major city I've lived in over the last ten years and couldn't get one, specifically trying to make my life easier running this system I mentioned earlier. The special edge case exception is actually having a copper line to your local ISP. It's definitely not the rule. Don't believe me? Take a few minutes to call up the phone companies in cities around the country and ask for a copper phone line. Almost all of them won't have copper. And I'm telling you from years of experience that using a modem across a non-copper VOIP line is flaky in exceptionally good circumstances and impossible in most cases.