KEEP PHONE GREETINGS SHORT: If someone is listening to your voicemail greeting it's only because they intend to leave you a message. Don't make them listen to 3 minutes of rambling in order to do so. Plus, you're more likely to deliver a clean, professional read if you stick to shorter greetings. If more specific information is needed, direct
You want to be able to easily access and change your greeting for holidays or emergencies. Ease of set-up and modification is vital to customizing and streamlining calls on an as-needed basis. Create a thorough and helpful voicemail script fit for your office Support and assist your customers in a positive and meaningful way Reduce workload on your medical receptionists Keep things in your medical office or dental office moving smoothly 24/7

Users often don’t invest enough time into their messages, resulting in incomplete, unprofessional, or otherwise under-whelming greetings. Sure, crafting a greeting doesn’t sound all that complicated; however, there are a number of pitfalls users can fall into—i.e. informality, terseness, sincerity, lack of direction, and more. While none of these sound too catastrophic, they are often interrelated. As such, they tend to worsen any problem. For example, humor can cause informality, worsen ambiguity, and weaken sincerity. That being said, users should strive to avoid ALL these pitfalls.
https://www.indeed.com/career-advice/career-development/professional-voicemail-greeting