How do I turn off the flashing light for voicemail or feature

To remove the voicemail indicator and stop the flashing light on your Panasonic home phone, you can try the following steps:
1. Access the voicemail system: Dial your home phone number from your Panasonic phone or another phone and let it ring until it goes to voicemail. Enter your voicemail password or follow the prompts to access your voicemail messages.
2. Listen to and delete all voicemail messages: Check your voicemail inbox for any new or saved messages. Listen to each message and follow the instructions to delete them. Ensure that your voicemail box is empty.
3. Exit the voicemail system: Once you have listened to and deleted all voicemail messages, exit the voicemail system by following the prompts or hanging up the call.
4. Reset the phone: Disconnect the power adapter from the back of your Panasonic phone base unit. Wait for about 30 seconds and then plug the power adapter back in. This will perform a reset on the phone and clear any residual indicators.
5. Check the voicemail indicator: After the phone has rebooted, check if the voicemail indicator is still active or if the light is still flashing. If the issue persists, proceed to the next step.
6. Disable visual voicemail feature (if applicable): Some Panasonic home phones offer a visual voicemail feature that may trigger the voicemail indicator and flashing light. To disable this feature, consult the user manual for your specific model and follow the instructions to turn off the visual voicemail function.
7. Contact Panasonic support: If you have followed the above steps and are still unable to remove the voicemail indicator or stop the flashing light, it's recommended to contact Panasonic customer support for further assistance. They can provide specific guidance based on your phone model and help troubleshoot the issue.
Remember to consult the user manual for your Panasonic home phone model as the steps and features may vary slightly.
this video might help

Blinking Light
Two reasons the light on top of your screen might be blinking or on steady.

• You do not have a voicemail key programmed and the voicemail is alerting you of a new message. Simply dial *8 and check your mailbox.

• Message waiting has been activated. To cancel:
  • leave handset hung up
  • press call1 key
  • dial 873
  • press speaker key

Blinking light on top of Display NEC Aspire

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.

That means that the voicemail system is no longer recognized by the phone system. Check the lights on the voicemail to see if its still receiving power.If so try unplugging and plugging the voicemail to reboot it. The voicemail can take up to 6 minutes to totally reboot.

Depending on the type of voicemail it can take up to 10 min, to fully come up. Is the power light lit in the voicemail cabinet? Also what kind of voicemail is it?

First off we need to know what color it is.

Green-Dial "0" from the problem phone and that should clear it.

Red-Dial "Feature 99 Feature". If that does not work.
Leave a message in that users mailbox. From that users phone check and delete that message.

If neither of these operations work then you may have a bad port which means you may need a new station card. The part is an ESI(8)-U10-ETU, ESIB(8)-U10-ETU or an ESIE(8)-U10-ETU. The U10 might be different.

Let me know how these options work.

Try Feature 99 Feature. This will clesar the large LED

Cycle the power on the voicemail system. If that does not work, you may have to replace the voicemail power supply, or send the voicemail system for repair.
Good Luck!

Try feature 69 feature. Or just the feature button by it self.

Turns out, that particular extension had a voicemail. Not sure how that happened, because it's a shared phone and nobody is assigned that extension.