While missed calls aren’t ideal, you can let your caller know you’re still there for them by having a great voicemail greeting. The best business voicemail greetings let your customers (and potential customers) know why you’re not available and how they can best get in contact with your business. They are also short and to the point. You usually want to keep your greeting between 6 and 24 seconds long so callers don’t hang up halfway through.
I have a confession to make: I haven't recorded a new voicemail greeting in nearly a decade. Since then, I've (hopefully) become more articulate, poised, and self-assured. But hear my voicemail recording, and you'd think I was still new to the work world, a little unsure of myself — and probably not an authority.

Whoopee, a call. I wonder who this could be? No…wait…don’t tell me…Oh yeah. Sorry, you bore me.
In a highly competitive graduate market even something like an unprofessional voicemail message could mean the difference between you getting selected for an internship opportunity or being rejected. There is no point in having an amazing interview and following up with a thank-you email to only let yourself down with an unprofessional sounding voicemail.