This number, when called back, identifies as "Accutel Conferencing".  A Google Search of Accutel Conferencing shows the companying hailing from Vancouver.  That's all I know at this point.

I get these calls from 1-(416) 354-4000 several times a day, every day and when you call back you get an automated menu from Accu-Tell. They are a call centre, or as they prefer "conference" centre- whatever that means. I have never done business with them so don't know why they keep calling. And my number is in the Do Not Call Registry, so there you have it.