Find some common ground. If you’re cold calling someone, your voicemail is your 30 second chance to make a connection and leave a good impression. One of the best ways to make a connection in that short amount of time is mentioning a mutual acquaintance. You could also mention a shared affiliation with an organization.
Here are 5 sample scripts for business voicemail greetings that will make you and your company look personable, knowledgeable, and professional. And here are some sample voicemail greeting scripts for doctors, lawyers, and dentists, in case you're not looking for business greetings.

I like to say my phone number very early so the person can hear it again quickly by starting the message over and does not have to listen to your entire message again to hear the number. But do repeat your telephone number at the end of the message at least once and speak very s-l-o-w-l-y so the person can write it down as they listen. If you don't get a response to your first voicemail, don't hesitate to record a similar message once a week for two or three weeks. This sounds a bit excessive, but my experience has been that if there is even the slightest chance of meeting someone now or even in the near future, this kind of message will get their attention.
In this blog post, we'll cover how to set up several voicemail greetings: a name recording for your voicemail box, a default greeting, and a temporary (for holidays and vacations) greeting.