Avoid sales speak and buzzwords. It’s okay if your prospect knows you're a sales rep. Qualified prospects don’t mind hearing from sales reps. They just want to speak to reps that are helpful, knowledgeable, and possess integrity.
Leaving voicemails can be intimidating: The recording starts quickly, the time you have to speak is limited, and only some answering machines give you the option to review and re-record your message if you mess up. You often have one shot, and a limited time-frame, to get your message across.

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.
While Ross panics about his friends slowly getting dressed for his big gala, Monica hacks into Richard's answering machine and leaves a mortifying message ("I don't know, maybe I'm getting my period or something")which then becomes his outgoing recording.