Currently online! Dial 020 7233 6854 in the UK, or +44 20 7233 6854 outside the UK. Once the fax server answers, press Start on your machine.
If you’re using a more modern device, look for the “fax polling” option — you may have to manually disconnect the phone line to stop it.
Built using fax polling, an obscure extension to the now-mostly-forgotten fax protocol.