I answered, out of curiosity, and it's a scam claiming to be the IRS stating they are filing a lawsuit against me. The IRS will NEVER call you!! They may send written notification or contact you in person (with proper ID) to notify you of these things, but will never notify you via pre-recorded message.
So I just got a call from this number and they claim to be from the IRS. They asked for my name.. and I asked, "who are you again?" and they asked for my name again with an attitude. I asked them again, "who is this calling?" and they continued to ask what was my name raising their voice. I just hung up.