VTech I6778 Ringer is muted temporarily during incoming call, Your operation has been saved, Call

Handset display screen messages

RINGER MUTE	The ringer is muted temporarily during incoming call.
SAVED	Your operation has been saved.
UNABLE TO CALL	Target handset is out of range, or on an external call during intercom
TRY AGAIN	call.
UNABLE TO SAVE	You are attempting to save caller ID entry with no name or
	number.
WARNING	The battery is not installed or not installed properly in the handset.
CHECK BATTERY!	-OR -
	The battery needs to be replaced.
	-OR -
	An incorrect battery has been installed by mistake. Use only the
	supplied VTech battery or equivalent.
XX MISSED CALLS	There are un-reviewed calls in your call log.
MICROPHONE ON	MUTE has been turned off and the person on the other end can
	hear you.
LINE IN USE	A handset on the telephone line is in use.
ENDED	You have just ended a call.
NO LINE	There is no telephone line connected.
NEW VOICE MAIL	There are new voice mail message(s).
PHONE	The handset is in use.
SPEAKER	The handset speakerphone is in use.

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