LED signalling on the key:
red	There is a dedicated connection to the answering machine.
red (blinking)	A message is currently being recorded on the answering machine. Simply pick up the receiver to take the call.
yellow	The answering machine's capacity has exceeded the warning threshold.
yellow (blinking)	The answering machine is full.
green	No new messages are present. Only recordings that have already been listened to are present.
green (blinking)	New messages are present.
off	The answering machine is empty.