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.
In certain situations, it’s a good idea to let a call go to voicemail. If you’re in a loud area, unable to spend 10-15 minutes talking, or are otherwise distracted, don’t answer. Recruiters who cold-call candidates will understand that you’re simply unavailable – but make sure to return calls in a timely manner. If possible, call back during regular business hours.

Hi. I am probably home, I’m just avoiding someone I don’t like. Leave me a message, and if I don’t call back, it’s you.
Voicemails can give an important message or inform the caller about the receiver's status. Thus, it is important for you to be clear while recording such messages. Here are a few examples of voicemail greetings to get an idea about appropriate messages that can be recorded the next time you leave your house or desk.