Relax everyone! I have noticed this number (613) 232-7437 seems to be the number that often gets posted on caller ID equipment when people call in from overseas. For whatever reason the local routing carrier in Ottawa, whoever that may be, assigns this number as the calling number, however it is a bogus number. I don't think anything can be done about it, but if it really bothers you you might try calling your telephone service provider and have them investigate this.

Got a call from this number, nobody there. Came to this site.
Didn't bother calling back.  (October 24, 2007)

Got a call from this number.  Nobody there.
Called back, got a not in service message.

Someone has called me from this number twice in the past week. No message is left. I can assure you it is not a collection agency because I don't owe anyone or any organization any money (except my mortgage). If it is a collection agency, then they are calling the wrong person. But, I suspect it's a spammer.

This is a Skype landline originating in the Ottawa area.  Anyone world-wide placing a call in the Ottawa area could go out on this line.

This call came in from someone supposedly representing TD Canada Trust asking who made the last transaction at the bank etc.
Obviously a scammer.