Answer incoming calls during normal hours with a custom phone greeting specific to your business with routing options to particular departments or employees, or just give callers the information they need.
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.

The service also recommends stating your name, apologizing for missing the call and that you will call them back. If possible include a time frame for a return call. Don’t ramble or include un-needed information.
While this information can be tucked behind a phone menu option, it's best to state it upfront in your after hours recording. This way, callers can decide whether to call back at a better time, or leave a voicemail message.