Website: https://grasshopper.com/blog/perfect-voicemail-greetings-10-tips-for-recording-effective-and-professional-messages-plus-examples/
“Hello, you’ve reached [X company]. We can’t take your call right now, but please leave your name, contact information, and reason for reaching out, and one of our team members will be in touch within 24 hours.” “Hi, you’ve reached [company]. Unfortunately, we’re currently unavailable. But we want to talk to you — so please leave your name and number, as well as your reason for calling, and someone will call back ASAP.” “Hi, you’ve reached [company]. We’re available by phone from [hour] to [hour] [time zone] Monday through Friday [optional: and from hour to hour on the weekends]. You can also contact us by going to our website, [URL], and live-chatting or emailing us. If you’d like us to call you back, please leave your name and number after the beep.” “Hello, you’ve reached [company]. If you’re looking for information on [X], please check out our [Facebook page, company website, etc.] If you want to know more about [Y], take a look at [Z page on our site, our YouTube channel, etc.] Still have more questions, or just want to hear our lovely voices? Leave your name and number, and we’ll return your call straight away.”

If you use one, your automated phone system is the first point of contact a caller makes with your business. You want to make the best first impression. Instead of a complex series of robotic instructions, choose a friendly, warm voice offering simple phone prompts to guide the caller to the person or information they’re looking for.
The above section details types of phrasing to avoid; however, it doesn’t detail what users should NOT say on their greeting. Though this is a bit loaded, as there are hundreds of combinations of things one shouldn’t say, there are some key components users should ALWAYS avoid. a. Forget About Slang: You should strive to be as professional and welcoming as possible in your greeting. While this may steer you towards using slang, in an attempt to make callers comfortable, it’ll most likely work against you. As a professional, your demeanor, tone, and speech should be clear cut and well articulated. Using slang undercuts this and works against you. b. Don’t Even Think About Profanity: This is a no-brainer. Never, under any circumstances, curse in your greeting EVER! c. Keep Your Sentences Clean, Don’t Ramble: Introduce yourself and give your caller specific direction. Avoid long diatribes detailing tangent thoughts. Keep it simple and quick. d. Always Return Your Calls: It’s important for callers to feel they are valued. Nothing dissolves this quicker than a greeting that doesn’t stress this. For example, “I’ll call you when I can,” “If I don’t return your call, please call back”—these phrases are terrible and completely destroy any good will you may have with a caller.