I get multiple calls from this number, saying it's Tom from Home Monitoring Systems.  Finally called back and pressed "1" to stop calls.  Hopefully it works.  I get the same type of call from different numbers, and it's worked so far.  So annoying.  Also received calls from 503-468-5227, 971-220-1019, 267-235-3729, 503-902-8297, 508-475-1968, 602-214-3653... they will NOT stop changing numbers :(