A Lieberman wrote:


ATC came back and said, 43 Lima, cleared to Covington LA as filed, climb to
5000, squawk 1234. I think, by me saying "ready to receive clearance",
triggered the response.

No, he came right back with your clearance because he knew exactly where
you were. It had nothing to do with your being ready to copy a
clearance. Nobody gets an IFR clearance unless the controller knows
where you are.