When calling any business number, you are often greeted with an automated voicemail greeting that helps guide you through the company directory, hours of operation, contact information and alternative steps for the call, such as leaving a message.
As you prepare to work from home, consider updating the outgoing message on your desk phone so external callers know you are working remotely.

Our audio engineers are able to work with voice talent and customers remotely to reduce social interaction. If you need to direct a voice over recording you can still do this via telephone.
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.