I straight out put RISC-V board into the retro-looking landline phone from ebay. Some soldering, a gpio-matrix keyboard (mine is a keypad and not a real pulse r

I straight out put RISC-V board into the retro-looking landline phone from ebay. Some soldering, a gpio-matrix keyboard (mine is a keypad and not a real pulse rotary) and baresip integration and it kinda works.