You need to go into Ringing Service. Do not use group 1. Use group 2 and remove recpt telephone, that will be in by default and insert the Vmail DN (Ftr 985). Then apply group 2 to all your incoming lines. Not personal DIDs. Then put a Ringing Service button on Recpt telephone, (Ftr 871). Press button, full time AA, button will be solid. In morning, press button, live answer, button light off.
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