If your business is closing on one of its normal operating days for a holiday, or is dealing with an emergency or unforseen situation, you should update your after hours announcement to avoid confusion.
You should script out your greetings, rehearse, and find a tone of voice that is reflective of your professionalism and your company’s personality. If applicable, your tone and your message should take into account that certain industries and companies are more conservative than others.

For many small businesses, the announcement will send the caller straight to a voicemail box. But larger organizations may decide to direct callers to a phone menu or forward the call to an external destination, depending on the situation. These options can include: Listing individual voicemail boxes for different departments or employees. Forwarding calls to a professional answering service. Giving callers an option to connect to an after hours or emergency support line. Directing calls to a personal cell phone. Presenting menu options for additional recordings about office locations, ongoing promotions, and other information.
Be honest...you've been fooled by this one before, haven't you? It goes like this: riiiing, riiing, riiiing "Hey." "Hi, it's Juli what's up?" "Oh. I'm not here right now, leave me a message after the beep". There is actually very little I find more irritating than this voicemail, especially for business. Why do you want to fake out a business opportunity? This voicemail leaves callers feeling embarrassed and you looking foolish.