Device pinout
| Audio line input | PCB | Ethernet 1 |
| Audio line GND | ||
| Speaker - | ||
| Speaker + | Ethernet 2 | |
| Electret microphone input | ||
| Electret microphone GND | ||
| Relay 1 contact A | Video camera | |
| Relay 1 contact B | ||
| Relay 2 contact A | ||
| Relay 2 contact B | System led | |
| Call button contact A | Power supply GND | |
| Call button contact B | Power supply 12V to 36V |