How do Huawei phones intercept strange numbers?

operation method of emui5.x: open the mobile phone housekeeper, click SAO Ran Interception, open settings, select interception rules, and open: intercept unknown/hidden numbers and automatically intercept harassing calls. Operation is as follows

emui3.x &; 4.X Operation method: Turn on the mobile phone housekeeper, turn on the harassment interception function in the settings, and turn on "Interception of incoming calls with unknown numbers" in the interception rules. The following figure