Finally was able to answer the phone when they called at 1:43pm PDT today with caller id of "unavailable". It was eWeek resources confirming a couple of no-charge IT publications I previously requested. Stated they are not allowed to leave messages... that coupled with the "Unavailable" caller id has got to make things tough for them. They also confirmed the conversation with an eMail from the domain www.eweek.com
I get this call at my work. They never leave a message. I called it back and got a fast busy - no doubt a teller marketer or something/ I will pick up next time to see who it is.