This project constitutes a very simple SIP door phone adapter to be connected to an analog, multi party door intercom system conformig to the formerly popular 4+N standard.
- Raspberry Pi 2B+
- Salvaged cheap Sennheiser USB headset electronics (or equivalent)
- Salvaged 12V external HDD power supply (wall wart or whatever)
- Interface electronics
- Eurocard size perfboard
- FIBOX MNX PCM 150/100 T project enclosure
- twinkle
- A bunch of shell scripts
- a systemd unit file