B0 B1 B2 B3 - Connectors for FXO (analog trunk, PSTN) lines
A0 A1 A2 A3 A4 A5 A6 A7 - Connectors for FXS (analog subscriber) lines
| Headphone | 3.5mm External headset speaker (headphone) connector |
| Mic | 3.5mm External microphone connector |
| Ethernet | RJ45 10-100 BaseT ethernet connector |
| Power | Power |
| Relay | Two user controlled relay contacts (open / short) for various purposes like door opening |
