I got calls from 206-900-9172 and 206-900-9173. I called back from a different number. I had trouble getting through, but when answered, it was someone with and Indian accent both times (both numbers). I said I was returning a call from this number. They asked what was it for, I said that the IRS was having trouble reaching me. They asked for the telephone number this was in reference to. I said who is this. They said they were the IRS. I said it doesn't sound like the IRS, and they hung up both times.
Once they called and I answered, they didn't say anything and hung up.