"i don't know how i missed that point in the opening post"
I sure as hell do, old age!....happens to me the odd time.
grin

"please hold briefly while we connect your call"

I think it takes 11 seconds or so for AA to transfer to attendant when digits are not pressed.

I would have them go AA just for a couple weeks at least.
I would set it up as "thank you for calling ABC, if you know your parties ext enter it now or press 0 for customer service".....short an sweet.

The Info box should have a greeting that sounds somewhat professional "This number is no longer in service"
Do not lead on that the number is blocked or they will use another phone or use *67

Otherwise I agree there is not much else you can do.





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