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.
To improve a a business voicemail greeting, keep these eight rules at the forefront of the creative process: Avoid turning customers off with overused and impersonal phrases like “your call is very important to us..." Avoid leaving customers unsure by not immediately telling them the business, department, and/or person they’ve reached. Avoid leaving customers confused with too many details and complications; just keep it simple. Avoid messages longer than 25 seconds. Do apologize for being unavailable at the moment. Do invite the caller to leave a message. Do tell the caller when they can expect a return call and actually follow through within that timeframe. Do tell the caller about any applicable alternative options of contact and information- website, live chat, email, social media, or emergency numbers. Voicemail Greetings 101

25. "Hello! Thanks for reaching out to [company]. We're closed today for the holiday, and will reopen tomorrow. If you leave your name, number, and a brief message, we'll give you a call when we're back in the office. Thanks again, and have a great day."
“Hi, you’ve reached the desk of (your name). I’m currently out of the office on vacation and will return on (insert date). If you need immediate assistance, please call my assistant, (insert assistant name) at (insert assistant’s phone number). Otherwise, leave your name and number, and I’ll get back to you when I return.”