Before we head towards the tips for you to get started on creating efficient voicemail messages, there is one thing you need to realize.
Provide as much useful information in your business voicemail greeting. However, be sure to keep it short and concise. An excessively lengthy voicemail can be damaging rather than helpful. Keep your voicemail to around 20-25 seconds maximum.

Customer experience is today’s business battleground. At a time where it’s common for even the most established businesses to deliver poor service, incompetent support, and just outright bad communication, how do you stand out? As big companies fail in the customer experience department, doors open for small business owners and entrepreneurs to distinguish themselves.
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.