Similar to your phone greeting, your voicemail greeting should state your private practice name and instructions on what information to leave on the message (such as name, number, and the best time to call back). Include instructions on what callers should do in case of emergency.
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.

As I mentioned above, some words like ‘can’t’ are often mispronounced by non-native speakers and it can sound like a swear word!
Do you have lots of satisfied customers? Give them a voicemail option to record a brief testimonial about why they love your product or service.