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.
3. Call your voicemail. Using the dial pad, type in the phone number assigned to your voicemail account, and then press the green Call button. Or, just press and hold the 1 key if that's easier.

Website: https://getvoip.com/blog/2013/07/17/guide-to-professional-voicemail-greeting/
Never miss an important voicemail when you’re out of the office or away from a computer. Checking your messages by phone is a snap. Just follow these five easy steps: 1. Dial your RingCentral number. 2. Press * as soon as you hear the phone ring or the recorded message play.