Increase the odds of getting a call back by mentally composing your message before each call. And remember, people hate it when callers state their name and phone number too quickly in voice mail messages – no one wants to listen to a message ten times to comprehend simple information. Begin by saying your name and company (if applicable). Then assume the person you’re calling doesn't have your number, so say your phone number twice. If your name is at all unusual, spell it the first time you say your phone number. Talk slowly like you were writing it down yourself. The second time you say your phone number, you can say it at your normal rate of speech. A gracious phone message is no longer than 30 – 45 seconds. Be pleasant, but also get right to the point. Keep your voice mail message to two points maximum. If you need to share more information, then say you will send an e-mail message with the rest of the details. Leave a specific message. There’s nothing more frustrating than a voice mail that says, “Hi, it’s me. Call when you can!” Even if you’re just calling to say “Hi”, tell them that in your message. End on a high note! You don’t necessarily need to say “Goodbye” at the end of a voice mail, because you didn’t really talk to anyone. Instead, try something like, “Look forward to talking* with you!”
The following sample voicemail messages will help you to use this form of communication effectively, whether you are leaving a message for someone to return your call or recording a greeting for people trying to contact you.

Don’t confuse voice mail with automatic attendant systems. Automatic attendant, where the computer actually answers the phone, is the single worst business invention ever. Human answers. Human determines if the person you’re calling is in by ringing their phone and monitoring the response. If not in, human returns and says, “Mr. Jones is not in. Would you like me to help you personally, take your message personally or would you like to leave a detailed message on his or her voice mail?” You faint from the shock.
18. “Thanks for calling [Company name/your name]. We hope you’re enjoying the holiday season. We aren’t available at the moment due to our holiday hours. Leave your name, number and the reason for your call and we’ll get back to you ASAP! Thanks for calling.” Everyone deserves a break. Let your callers know although you might be enjoying one too, that their needs are important.