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 have reached the office of [Business Name]. All of our representatives are currently busy. However, if you choose to do so, you may leave a brief message, including your name, number, or email, and we’ll be sure to get back to you as soon as possible. Thank you for calling [Business Name].

Promote your business to the callers while they're on hold. Inform them of your range of products and services, their benefits and how they can help them. Or just re-enforce your branding with some pleasant background music.
Voicemail Greetings – outgoing message recordings for after-hours voicemail box and when a call can’t be taken.