Exaaaactly!
I feel that the quality of the outgoing VM message on my phone, as recorded through the phone's built-in mic sucks. Since I have studio-quality recording equipment in my house (from recording audio book narration and musical vocal recordings), I'd like to just record a nice high-quility normal outgoing message with that, save it as an MP3, and have my phone use that.
And, I get that, in my case, the outbound message ultimately comes from Verizon's server, not from my phone itself (since the OB message still works when my phone is off or dead). But... HOW do I get this MP3 where it needs to be? And, playing it out of a speaker and recording that with the little mic in my phone is not acceptable and defeats the whole purpose.
Still searching for a solution.