Red message light blinks constantly even when no message or call was received. Messages have been erased

You Have To Put Your Handset Model and full description

Thanks!

Press MESSAGES and look at the display. It will tell you where the message came from and the 3rd softkey will let you erase the message.
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Download a copy of the manual here. Record you message following the instructions on page 56. Listen to your messages following the instructions on page 58.

As for the blinking light, you have unheard messages on the voicemail system provided by your telephone company. This system records messages when someone calls while you're already on the phone. Please contact your telephone company for instructions on accessing their voicemail system.

If mail box is full, you cannot record any more messages, and the answering machine is practically useless. You must clear some messages.
Try playing the messages one by one. While a message is being played hit the Erase button. If that works, repeat with every unimportant message.

Most cordless telephone answering machines have a maximum of 14 minutes recording time. You can restrict the length of messages people are allowed to leave. Most default options are 1min or 4 minutes. Some machines give you the option to select Announcement Only. When this option is selected people hear the announcement but cannot leave a message.

Read you manual for more configuration options.

press #409 to cancel message receive
press #64 follow by et\xtn on display to cancel sent message

mayb st 21 been assigned, but no body know.to check, call from all extn to displayed phone.check 1 by 1.
if light keep blinking for mic, try to change other key phone 

when I have voice mail messages un-checked, it blinks steady. after erasing, it works right

Do you have a base and have you checked and deleleted the messages on the base? If you have a base that has an answering machine in it it won't stop blinking until you have erased the messages on the base as well. I would start with that first, but I'm unsure what type of phone you have.

Use one of your handsets. Go to menu, select answering device, select erase all.
It worked for me!

I found that if I hold the "find hs" button on the BASE unit (right above the red charging light) for a few seconds, it works!! Thank goodness there is a solution! Thanks for the help.

Here are sample paragraphs from the user manual : hope it helps !

The new message LED on the handset flashes when you have new messages in your
answering system. The LED stops flashing when all new messages are played back.

3) To delete all messages, press delete messege in standby mode. Press delete
messege again after the announcement "To delete all messages, press delete
again."
When you try to delete all messages without first listening to your new messages,
you hear several short beeps followed by an announcement "Please playback all
messages." This protects you from accidentally erasing messages you have not yet
reviewed.
Important:
When you press delete messege, you are permanently deleting the message. Once
deleted, the message cannot be replayed or retrieved.