Just got the call from this number about 5 mins ago. They leave a message stating that "The IRS is filing a lawsuit against you. Please call back this number for more info." Bull to the highest degree. I wonder how many people are getting scared into calling back this scam. I take care of an elderly relative and I screen all calls. If I didn't, crap like this would cause a lot of needless worry. Just block the call if you can. It's a scam to scare you into giving up your information by returning the call and confirming that the phishing job worked.
I found 2 voice mails from the number, please call 314-449-9388 immediately to the department (non was specified). Check number in this website and found it's fraud.