It's a collection agency called Global International.  
They have a website for consumers that are getting called:
http://www.globalcollection.net/Consumers.aspx

They call me 5 or 6 times a day and don't leave a message.  Very annoying.

this number is showing up repeatedly on my VoiP statement - no clue who it is. what i see is that they are using my VoiP phone number and dialing to an out of the country phone number... !! it appears they are using roll over numbers too.

here is a copy from my statement:

03/03/08       11:00 PM GMT       (905) 413-8799       +12121110013       1 min

03/10/08       3:18 PM GMT       (905) 413-8770       +12121110013       1 min

This is for Global Credit.  They consistently call my home and hang up on my answering machine.  So, playing by their rules, I continuously called them back, dialing *67 before the 1 + phone number (this conseals your caller ID on their end) and simply said nothing.  I did this for over an hour and was more than thrilled to discover that they soon turned on their answering machine.  My logic is this:  They must enjoy the harrassment as they have no problem dishing it out to others.  I strongly suggest that others also impliment the above steps in dealing with Global Credit.  Here is also an additional number they can be reached at:  (905) 413-8660.  Have fun!!!!!!

I keep getting calls from this number that says it's from Ontario, Canada.  If they are a collection agency, isn't it illegal if they are in another country?

They call me 5 or 6 times a day and don't leave a message. ?Very annoying.