After leaving four or five messages without receiving a response, you should stop calling – at least for now. Don't expect the courtesy of a call back from a hiring authority. Unless they have a need for someone like you, it is not likely that they will call you back. Don't take it personally. If you are looking for a job or soon may be, join Tony Beshara for a FREE webinar: The Top 10 Reasons You Might Have Trouble Finding a Job (and How To Combat Them).
Calling leads is an important part of growing your business, but it can get frustrating when you call and call and never get a reply. Having phone scripts in place can make all of the difference in the effectiveness of your lead calls. Scripts allow you to come across as confident and professional and convey all the important points you need to make. No more stumbling over your words or forgetting to mention an important factor, like your name or phone number. Scripts will help you stay consistent and make calling more enjoyable because you’ll know what works and what doesn’t.

Perhaps the biggest mistake in a sales voicemail is pitching too aggressively. If you sound like a smarmy used car salesperson, your prospects are going to delete your voicemails faster than you can say "lowest price guaranteed!"
State your number right after your name. Many people wait until the very end of the message to state their number. This will irritate the receiver of your message because if he doesn’t get it down, he then has to sit through the whole damn message again to hear it repeated.