You can use the voice mail trace to see what the mail is seeing to cause it to answer. Personally if you have nothing programmed in the DID table I'd bet on a ringing line appearance on a digital set that's not plugged in with a fwd to voice mail in the class of service. You could always pull the SMDR records in Hperterm to see if you see any incoming digits on the call. Oh and it should default to the Operator unless line ringing is assigned elsewhere.

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