Disconnecting VoIP

My elderly father has been moved to a care facility in a different town from his home and we have installed new Comcast service there, including a VoIP.  Unfortunately, we couldn't move his existing number that he has had since 1964 because of laws/rules surrounding routing to emergency services when 911 is dialed.  We've call-forwarded his old number, but we are needing to sell his home and will need to disconnect service there.

In the "olden days" when a phone number was disconnected (before cell phones were the norm), there was a recording placed on the disconnected land-line number that stated what the new number was.  We would hate to have to try to notify all the people who have his 60+ year-old phone number.  Is it possible to disconnect service and have a recording with the new number on his phone number for some period of time?

Thank you!!