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.
“Hi, thanks for calling the office of (insert your name). I’m away from my desk or out of the office. Please leave your name and number, and I’ll return your call as soon as possible. If you need immediate assistance, please hang up and reach our customer support team at (insert phone number). Thanks, and have a great day!”

Rather than waiting for a callback, open up additional channels of communication with your callers by inviting them to email. The most professional voicemail greetings often include an alternative method of communication.
5.) Bienvenue chez John Doe – Merci pour votre appel. Actuellement, nous sommes tous occupés. Restez en ligne, nous serons rapidement avec vous.