This number has called multiple times the last couple of days.  Mostly shows up as 'unknown name', but did come up one time as 'sialk.ca' who appear to be a long distance reseller.

I finally did answer a call since the constant callbacks were annoying.  A woman asked for me by name and told me that Yak Communications asked her to call to give me a special money saving offer.  I cut her off indicating that the phone muber is on the National Do Not Call List, and asked they not call anymore.  Hopefully they will stop calling.

I received a couple calls from this number, one after the other, but I didn't answer.

Got a call today at our business from a foreign male, wanted to verify our business information -- hours of operation, mailing address, etc. I work at a doctor's office so all of this is normal. I got suspicious when they asked me to repeat a "verification code" which was supposed to be this guy's birthday. I said no I don't think so and hung up. A few seconds later I picked up the phone again and the same person called me a bi*** and hung up. Caller ID said Ontario Call.

Just got a call from 200-9 (no area code, just that number in the info part plus "unknown" of course). I answered, no reply, they hung up. This was on 4/10/14 at 2:53pm

also received a call from this number

I received 2 calls from this number, one after the other.  It was an Indian man.  He was offering duct cleaning for $100.00.  When I said I wasn't interested, he insisted I should take his offer.  I told him I was on the "Do not call list" and he should know about that, and he didn't care.  He wanted me to take his offer.  I put down the phone.