Are you sure you don't mean lawbreaking Portfolio Recovery Associates? The name sans "recovery" appears to be for an innocent looking PR firm in Philly.
I got one today, too (June 16, 2011) I didn't recognize the number so I didn't answer. Thanks for posting about this being another Portfolio Recovery number.
They just called me about 30 minutes ago, i didn't hear my phone ring. Debt collector I assume. But as far as I know, in CA, they have to call from the same state to collect money from you.