I have found more instances of this.
When users in a department leave, I have been forwarding the extension,(real phone) or just extension number,(phantom) to a an auto attendant whose sole purpose is to say the extension is inactive and then forward the call to a hunt group for re-answering. This has been in place on the V5000, (ver 6.0.63) I had for over a year.
Now the v3001r,(ver 6.0.63) is not handling the call as expected.
The work around was to use a hunt group extension number, and forward that group to the auto attendant.
Original Call Flow is-
AA to extension, extension forwarded to (another or same AA). This AA will not play prompt and uses T/O setting.
Work around-
AA to extension, extension forwarded to huntgroup, huntgroup forwards to AA(another or same). AA will now play prompt.