2N VoiceBlue Lite - Manual v2.6 - Manual (Page 29)

2N - VoiceBlue Lite
module or a SIM card is absent, the red LED remains lighted. If a
GSM module is not supplied, the respective GSM LED is blinking
red. Upon a correct GSM module initialisation, the SIM card is
logged in, which is signalled by a quickly blinking green LED. If
the log-in has been successful, the LED goes out. If not, it shines
red continuously.
In normal operation, a continuous green LED indicates an
incoming or outgoing call within the particular GSM module.
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