Unlocking an SPA-2102 ATA in 2021

Note: this post was originally published as a Twitter thread. Recently I watched Cathode Ray Dude‘s videos on faxing from Windows and dialing up at home, and I was inspired to experiment with modems and faxing myself. He has a great article on configuring an ATA (analog telephone adapter) to place calls between phones/faxes/modems without a need for a telephone network. I went ahead and got myself an Linksys SPA-2102