I often mention and link to people here whom I admire for one reason or another. People like Charlie Glaize, Mary C. McKitrick, Philip Banks, Pat Fraley; and if you read through the archives of my posts long enough you’ll find others.
Why do I admire these folks? Because every one of them has something valuable to teach me and you. Actually, several valuable somethings.
So, then, the system mentioned in the title, as posted on the VO-BB.COM:
Pick up the phone and
Informal chat with someone who
Looks for voice overs.
Introduce yourself and ask friendly questions
Pay attention to the answers
Bring your web site into the conversation
Ask if they would like to receive a demo CD
Never ask for feedback if you do send one
Keep your interaction friendly
Say thank you for their time
(Philip concludes with this aside: Lucky for me no one believes that it works!)
(Update) Here is another pass by Mr. Banks at this information, from a slightly different point of view:
The quick start programme.
1 Get a list of around 100 telephone numbers of people who use voice overs.
2 Call them. Introduce yourself “Do you ever use freelance voice overs in your productions (assuming yes) Great! May I send you a demo CD? (do not pause) You’re allowed to say no by the way. That’s wonderful.” (Confirm details and say goodbye)
3 At the end of the phone session send the demo’s. Your target is to have sent 50 by the end of this exercise.
4 Give it a few days and then call again. Introduce yourself again. “I spoke to a few days ago and promised I’d send you my voice over demo and I’m just checking in with you to ensure it’s arrived safely”. DO not ask for feed back, do not ask for feed back. When they say yes and usually start to say “but I haven’t had chance to listen….”. Say clearly that you weren’t looking for feedback you were just checking it had arrived, say thanks again and add you look forward to hearing from them. You’re dying to ask for feedback aren’t you? Don’t you  dare!!!
That’s it, end of process. After a few weeks and 50 demo’s if you have not had one person hire you it’s unlikely anyone ever will. If one person hires you that could be luck, if two people hire you then you’re onto something.
(edited to correct typos)