When recording your business voicemail greetings on your VoIP phone system, make sure to state the correct time when your callers can expect you to call back. If your call-back policy is within two hours or 24 hours, make sure to say the correct expected time so your callers don’t waste their time waiting for your call.
If they don’t leave a message, you’ll never know who called. Some people may assume they should just call back later. But if you prefer to get back to them at your leisure, encourage them to leave a message.

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.
You’re growing tired. Your eyelids are getting heavy. You feel very sleepy now. You are gradually losing your willpower and your ability to resist suggestions. When you hear the tone you will feel helplessly compelled to leave your name, number, and a message.