Who called from 4154841880

This VOIP number called and hung up after one ring.  They are also apparently using 415-484-1894, which called on subsequent days at the exact same time of day and also hung up after one ring.  It sounds like a computerized scammer fishing for working numbers.

And also if the called party returns the call, the equipment at 415-484-1880 gets the CNAM along with the number of the returned call.