Called at 4:45am and again at 7:00am and no one is there. Very eerie. Call back from blocked and the line is busy.

Called 7:15 AM. Has called repeatedly but never leaves a message.

We received a call from this number telling us an Alarm had gone off.  They then hung up.

When we called back there was a tape telling us to call our alarm company.

COMPLETELY BOGUS!!!

I received a call from this number at 5am then again at 9pm, no voicemail either time. The number looks vaguely familiar but doesn't belong to any of my contacts.
I received some calls like this last year when there was an issue with my 24 Hour Fitness account. I'd gotten a new credit card and they had attempted to bill my old one. After I got things straightened out the calls stopped. I don't remember exactly but it may have been this same number.

It is Security Solutions inc in Seattle.