C3BBS, a BBS for retronetworking usage at CCC events such as the has just gone live. You can reach it over IP, but also via dial-up from within the OCTOI (ISDN over Interrnet) network and via dial-up on the @c3isdn network at - also available via telnet and ssh (see profile links)
@fraxinas @c3isdn all public telephony in Germany is SIP these days - and using analog modems over SIP is a bit of a nightmare, there are way too many things that can go wrong. This is exactly why we created the OCTOI network in the first place (see https://media.ccc.de/v/osmodevcall-20220429-laforge-octoi (en) or https://media.ccc.de/v/vcfb2022_-_167_-_de_-_202210091500_-_octoi_-_harald_welte (de)
@fraxinas @c3isdn you can check https://www.telnetbbsguide.com/bbs/connection/dial-up/list/brief/ to see BBSs that still offer modem dial-up on the PSTN
