If you’re too mysterious with information, suspicions will be raised. If you leave a mini-sales pitch that’s all about you, the prospect will most likely make the decision not to return your call.
Make the last thing you say be your phone number. This ensures it's clearly visible on voicemail dictation, and makes it easy for prospects to call back. Avoid phrases like "Call me back when you get this," which can sound pushy. And, finally, tell them you'll follow up with an email. This gives the prospect two ways to return your call, which certainly can't hurt.

But that doesn't stop some millennials like 26-year-old Nick Sirianno from feeling that voice mail is clearly a thing of the past.
It is no surprise that your actual voice mail greeting must be delivered in the same way: Professional, clear, brief, and to the point. In a previous blog, "Marketing Messages on Your Cell Say You Mean Business," some techniques for making a professional voice mail greeting were discussed. There are many similarities between leaving a voice mail, and producing a voice mail greeting. You want your callers and receivers to hear a confident and professional person on the other end delivering a coherent message. You should introduce yourself to a prospective client in a personal way. An email doesn't generate much discussion, nor does it necessarily show you went the extra mile in contacting the client. Generating conversation. A professional, well conveyed voice message shows the voice mail receiver that you are confident and well-spoken, and that there is a person behind the message. Emails can be prepared, edited, and revised unlike voice mail messages An email or email chain thread is documentation of a conversation that can easily be referenced In an email you can include a phone number, address, website, etc that may be hard to remember or record through voice mail communication Emails can be forwarded, CC'ed, and blasted.