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LED Status
For R20X/R23X/R26X/E21 door phone:
| LED Status | Description | |
| Blue | Always on | Normal status |
| Flashing | Calling | |
| Red | Flashing | Network is unavailable |
| Green | Always on | Talking on a call |
| Flashing | Receiving a call | |
| Pink | Flashing | Upgrading |