I got a call from (613) 688-5051 and when we answered we heard children laughing in the background.

I received a call this evening from area code (613) 688-5051 and when I called back it said number is out of service.  I tried re-dailing it and it said this number is out of service.  I am sure this a scam.

same thing happened to me except that the message  was  in Russian. My second name is RussianI don't know where they got my info . My phone  # is unlisted and it's a company phone. I could  tell that the person who left a message had a really good Russian, but also  I could tell he was not native Russian.This slight accent can be detected only by native speaker. Which is I am. So those telemarketers when to extent to find a solicitors with the knowledge of foreign languages. LOL I am not picking up. I need to find out how to block certain  numbers.

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Callers from this number do not leave messages, hang up when phone answered, can not be reached by calling 1 (613) 688-5051.
When phoning back to this number:
Calling direct, the message is "this number is out of service.:
The number can not be reached by dialing 0-(613) 688-5051. Operator indicates the number could be a call center or other marketing service which is only equiped for outbound calls.
Also telephone booth service phones can not be reached by calling them back.

A man called from (613) 688-6051 and said he was from Health Canada doing a survey on chronic diseases.