Snom C300 - System Management; Factory Reset Procedure

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Factory reset
1. Press and hold the key for 15 seconds.
The multicolored LEDs 1, 3, 5, 7 flash red quickly for five seconds and the
speakerphone plays a tone.
2. Press the key within three seconds.
The multicolored LEDs turn off and the speakerphone plays three ascending tones.