Guest posting is the marketing tactic of writing and publishing an original article, or any other relevant original content, on someone else's blog. . . .
However, I would not leave a voicemail until I had called that hiring authority many times. Only after I conclude that it is unlikely that I'll ever catch this person, would I leave a voicemail. The script for leaving a voicemail is not much different from the script for a live conversation: “Mr./Ms. Smith. My name is Sally Jones. My phone number is . I'm a recent college with a degree in _________. I'm offering hard work, determination, passion and commitment to an excellent employer like you. I would like a chance to meet with you. Again, this is Sally Jones and my phone number is . Please call me; I'd like to meet with you at your earliest convenience."

Many loan officers hand out their cell phone number. This is a way of selling themselves to potential clients and beginning a professional relationship.
Start your voicemail with a regular cadence, but get slower and slower the longer you speak. By the time you get to your phone number, you should practically be crawling. It sounds counterintuitive -- but this tactic actually makes prospects likelier to finish listening.