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Check if the circuit is broken, change the circuit.
Check if the connector is moist or rust, change the connector.
Ring once then disconnect when receive a call. Dialing function is available
Check if connector is in a moist environment.
Check if too many extensions are used together or the quality of extension is not good enough, change
the bad extension.
Most of the functions failed
Check if the battery is in low-battery state, change the battery.
Battery is in normal state, unplug the telephone line, remove the batteries, and reinstall after 10 minutes.
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