Leave a message. Bob's not here, please leave a message. You know the drill. I can't talk to you but you can talk to me. Who are you and why are you calling me? Hello, Bob's not here, please leave a short or long message. Say something. Hey it's Bob, do your thing at the ring. If at first you don's succeed, try again.or leave a message.
When you want callers to leave a message, make sure your voicemail greeting indicates that. Be sure to keep your greeting short and direct, and include the info you want to capture.

1. Personal Business Voicemail Greetings. Hello! You’ve reached (insert company name.) This is (insert name) in the (insert department.) My apologizes for not being available to take your call, but I’m on the line helping another customer (insert business’s most attractive result or purpose point.)
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.