This appears to be one number for pin.ca, which pitches businesses for sale.  
I do not accept unidentified callers - instead, they are shunted to VM by my 'droid's call blocker (See http://www.squidoo.com/extreme-call-blocker-droid-great-android-app for a real review - I don't earn commissions or have any association with the app's developers).

Now that I know they do not leave voicemail, I will program Call Blocker to simply pick up and hang up.

I get this call at least once a day. I don't pick up and they NEVER leave a voice mail message.

Have gotten a call from this # a few times...never leave a voicemail...looks like spam to me.

Wish I had an android so I could call block these #'s.

i Called the number back and the recording indicated this was for google adwords

It's Google Adwords calling to confirm details about your account and offer to help you if you have had any problems activating it / starting to use it.