Got one from that number on our office phone. It left a 62-sec message on our answering machine, nothing but beep-beep-beep-... Added to my block list.
Beep Beep Beep for over a minute. Might assume is a fax, but never did the "weeeeooooo weeeeeoooo weeeeeeeeee deeee deeee deeeeeee" sound. Just beep... beep.... Beep.........