Your phone system can be a powerful marketing tool for your business, and that includes your voicemail greeting. If you want to utilize this opportunity to throw in a quick humblebrag and keep callers informed of your awards and accolades, there are a few best practices, you should follow. First, keep the self-promotion brief and appropriately placed within your voicemail message. Don’t promote yourself and your products/services in the same greeting, and finally, only include current achievements in your business voicemail greeting.
Leaving a voicemail can still be a good way to grab the attention of a potential new customer. However, when it comes to leaving a voicemail, you only have a few seconds to actually grab the listener's attention. Most salespeople screw this up by leaving too much information and making themselves sound like a salesperson, which is the kiss of death when leaving a voicemail.

Website: https://www.americanvoicemail.com/articles/10-must-haves-of-professional-voicemail-for-real-estate/
Hi, this is Stephanie's answering machine. If you're the phone company asking for money, stop bugging her, she'll send it sooner or later. If you're a TV company advertising TVs, she already has a TV with every channel known to man, and several known to monkeys. If you called for any other reasons, please hang up the phone, start screaming, and run to the nearest shoe store. When you get there, ask them for a cheeseburger. (This probably won't help you, but we'll always have something to laugh about when we're bored.)