“Greetings! You’ve reached [your name and position]’s voicemail. I am away from my phone or [other important and expected job function]. Please leave me your name, telephone number, and a short message. I’ll get back to you as soon as I can, typically within [reasonable timeframe, like 12 or 24 hours].” How do I record my company voicemail?
Consider for a moment how your phone is currently being answered. Professional courtesy is quite often not the standard for many college students. An abrupt "Yeah!" could be listed among the more courteous greetings. The more outrageous remarks will often buy you a major black mark in the professionalism category—even if it was your roommate answering your phone and acting crazy. A simple "This is ____" is always a pleasant change for a college student call. Make the change today, before the next (or first) employer phone call. If you have a landline, you should also encourage your roommate to do the same.

Even in today's fast-paced world, customers don't like being greeted with an automated message. According to the New York Times, callers of a certain age are put off entirely if they are answered by a voicemail instead of a real person.
Hello. You have reached Erin Klineman, Marketing Manager for Stone & Associates. I am currently out of the office attending a conference until August 4th. I will be checking messages daily, however, if you need immediate assistance, please contact Marketing Specialist, Michael Kim at extension 240. Otherwise, please leave a message, and I will call you back at my earliest opportunity.