It’s important to stay semi-ambiguous, create interest and curiosity, and focus on simply getting them to call you back as the topic of your voicemail.
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.

There are plenty of options for business voicemail messages, including professional greetings, casual messages, and even funny ones. Consider your brand voice and target audience to choose the tone. And include directions for those who call.
I have a confession to make: I haven’t recorded a new voicemail greeting since 2014. In the past four years, I (hopefully) have 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. Obviously I need toupdate it. And if you haven’t changed your voicemail greeting in over a year, you’re likely in the same boat. After all, a professional voicemail recording boosts your credibility, makes you seem more competent, and encourages whoever’s listening to it to continue the relationship. A relatively unprofessional one — like mine, for instance — does the opposite: It encourages prospects, recruiters, and potential connections to run in the other direction. With that in mind, I’ve written 18 unique voicemail greetings for every situation. Pick your favorite, practice a few times, then record your new voicemail.