The phrase ‘Your call is important to us’ is very overused and can sometimes come off as insincere. Instead your professional voicemail greeting should say something like ‘We appreciate your call and look forward to speaking with you soon.’
Professional — Lets them know who they’ve reached, why their call has not been answered and when they can expect a return call.Personable — Lets them know their message has been received by a real person who values their call and will reach back out to them. Including humor and a personal touch is extremely important here (even if your industry prefers to be more “robotic” in their communications). What is the most professional voicemail message?

Humor also leaves a lot of room for misinterpretation—which subsequently weakens sincerity and authority. A caller can be very turned off by merely misinterpreting your joke. Why take this risk? Additionally, this could even cause callers to question your character. Say, for example, the president of a company’s mobile phone voicemail greeting was funny. What’s to happen if the caller didn’t like or get the joke? What if they found it offensive? Another scenario is that a caller is reaching out to you for the first time—i.e. they have no idea regarding your personality. What next? The point is, with this type of greeting, humor is bound to be more divisive so just avoid it altogether. c. Poorly Pacing Your Message and Bad Time Management: Don’t speed through your message. Speak clearly so callers know what to include in their message and when to leave the message. At the same time, don’t drag your message out. No one wants to sit through a diatribe. Just get to the point clearly.
Another great thing you can do in your voicemail messages is to leave a few spaces for your prospects to record their message, most of the prospects will do it because they know they will be reached out sooner given the situation of their need.