I don't think this is a Comcast telco voice mail issue, the system is saying that there are messages. So I go back to my idea that there is a dead message recorded ahead of a good one. You would be surprised what kind of freaky message can be left sometimes when people bob around inside the system. I once had a message that said "please enter password" the user kept entering the password until I told them to delete the message.

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"Old phone guys never die, they just get locked in some closet with an old phone system and forgotten about"

Retired, taking photographs and hoping to fly one of my many kites.