Found it on caller ID, they left no message.
I found this information on ITL, Seattle, Washington.
Check out their website
 Feb 12th, 2008
Hello, my name is Jody and I work at International Telcom LTD (ITL). We are a local exchange telephone company just like Qwest. I have received numerous complaints about bothersome calls that are coming from specific caller IDs - especially 206-337-0577, 206-888-1934 and 206-888-8920. These numbers that appear on the caller ID do in fact belong to my company, however these calls did not actually come from those numbers nor have they gone through our network in any way. It appears that the person making these calls is spoofing/faking their caller ID to appear as these numbers, but the calls are actually coming from somewhere else. This needs to stop. Not only is this dragging my company's name through the mud, but I am also receiving numerous threats from angry people who have been woken up in the middle of the night. Please be assured that I am doing everything in my power to stop this from continuing, and urge you to please file a complaint with your local telephone company as they should be able to track down the actual number that these calls came from (not just the fake caller ID that is being sent). I want you to know that I am very sorry for the bother that this very irritating scam has caused. Please help me to get this to stop by contacting your local telephone company.
 Feb 12th, 2008