I have a voice mail system (LVMU) that has been working correctly for several months. System is a CIX40VMPG. Receptionist answers during the day-if not answered after 25 seconds voice mail answers, auto attendant answers immediately for night transfer after hours. Extension 200 is a 20 button receptionist phone, extensions 201 and 203 are 10 button phones. All phones are DP5000 series. As of now, these are the only extensions with voice mail. The issue is that all of the sudden the MSG light on ext. 201 and 203 will not turn on when a person leaves them a message on voice mail, even though the LCD display confirms a new message has been left. I am able to turn the MSG on from another extension by dialing the extension and pressing MSG or dialing 7 unless I try to do it from extension 200. Pressing the MSG button or dialing 7 both fail if dialing from ext 200. Extension 200 MSG light works fine-turns on when leaving a message and I can turn it on from another ext. I checked the method of notification in the voice mail settings and they are the same for all three mailboxes and it is enabled. If anyone has any ideas I would appreciate your help. Thanks