From the comments, this number must be a Skype VOIP/telephone gateway. Anyone could be calling.

missed a call from it during sleep. called back but always busy.

Well it was the number stealing scam.  That address in Quebec they give doesn't exist on google maps...Called back tapped nine and it's owned by primus Canada. I've sent them an email asking to have my number removed from their list, well see what they say, however if they're aiding and abetting harrasing scam calls...

Received call at 1944 (744 pm) xmas eve.  Too busy (BY) to answer it.  Tried trace but to no avail.  When called mid day 081230 I just got dial tone.  (perhaps a fake dial tone, and was it collecting my calling number?)

I got a call from this number asking questions about my banking experience.  At the end the caller asked about the amount that I can come up to make investment and my name.  I naively gave out such information and asked the caller to keep them confidential.  When I realized there could be a leak, it was too late to take it back.  As a member of the society, I feel I have the obligation to help others in doing market research.  But, I think I am wrong.  I will decline to answer such a call from now on.

It's a generic number for re-routed calls through calling cards, skype, etc. The nature of the call could always be different. If it turns out to be a "business call" I would question their validity as they are obviously using "hard to track" numbers for a reason.