The Message Waiting indicator light is typically a notification pushed from your PBX to your phone, as your voicemail does not actually reside on your phone, but rather centrally on your PBX system itself. If you are not always getting MW indications on your phone, it could be an issue with your PBX/Extension configuration. I would check with whomever set up your phone system and have them take a look at the configuration on the PBX for your particular extensions.
Cisco CP-PWR-CUBE
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The IPC determines that the system voltage is less than 11 volts or greater than 16 volts. The IPC receives a serial data message from the body control module (BCM) indicating the system voltage.
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The IPC performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 3 seconds.
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The ignition is on, with the engine off
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