Voice mail allows business professionals access to messages -- even when they're away from the office. A call to any business or home used to mean one of three things -- an answer, a busy signal or endless, unanswered ringing. Increasingly, it now means an encounter with voice mail.
An excellent business voicemail greeting conveys your level of professionalism and competence while also providing your callers with a glimpse into your company’s culture and level of care. As minor as it may seem, your voicemail greeting can instill confidence and trust in your callers or it can be a cause for concern.

1. 15 Professional Voicemail Greetings to Engage Your Callers. Sorry about your luck. If this is an emergency, hang up and call someone who can help you now.
I think one of the most important things to include in a business answering machine message is the hours of operation. I've often called a local business during evening hours, hoping that someone might still be there to answer a question or take a message. If I get an answering machine, I always want to know when it would be best to call back. It could be that the business was still open at night, but no one could get to the phone. By including that information on the outgoing message, I'll know not to make any more after-hours calls. Smiling while speaking can make a business answering machine greeting sound pleasant. Jotting down the greeting will prevent mistakes when recording it.