Alpha Centauri Space Station. Commander Marlin can't come to the phone right now. He's either saving the universe from some dread, unnamed peril, or perhaps taking a nappie. Leave your name and number after the beep and he will return your call.
Friends and colleagues speak to each using first names only. So do people of authority. They do not call each other and leave voicemail messages asking for Mister, Miss, or Mrs. Therefore, when you call a person you want to do business with and you leave a voicemail message, refer to them by their first name only. Don't say mister, miss, or misses. Don't say their last name. Begin your voicemail message by saying only "hi/hello" followed by the person's first name. Or, you can even forget the "hi/hello" and just say the person's first name. That is how you show confidence and authority and separate yourself from weak salespeople.

#3 “Hey this is Bryan, I’d tell you what to do at the beep, but I’m pretty sure you already know what to do. So yeah, just do it.”
Greetings. You’ve reached the office of [Name]. I’m either out of the office or gone for the day. However, your call is extremely import to me, so I’d appreciate it if you’d leave your message, along with your contact information, at the sound of the beep. Thank you for your call.