This is VOCUS, aka PR WEB, aka HARO (Help a Reporter Out). If you've created an account on any of those sites, it's one of their sales reps calling to talk about their product and sell you their other marketing services.
Does it occur to them that I don't care to talk with them? I'm on the no call list. Just because I went to their site doesn't give them the right to bother me. And if they bothered looking at our site they'd know there is no one to take their call during the day.