I have my own answering machine on my home landline phone, with a message: they called ~3pm and left no message, before I could get to one of my cordless phone stations. I did some research -> likely from Iristel Inc. which seems to host some dubious VOIP phone numbers or spoofed scam numbers? maybe? Since I did not have a chance to answer...GOOD POLICY: don't answer unrecognized or expected calls!