What does the intercept mode in the black-and-white list mean?

Telephone numbers are classified into blacklist, whitelist, address book (except black-and-white list) and unfamiliar numbers (not in black-and-white list and address book). There are five interception modes for black-and-white lists: only intercept blacklists: that is, normally receive messages and incoming calls from whitelists, address books and strange numbers; Text messages and phone calls on the blacklist will be blocked. Only white list and address book are accepted: that is, short messages and incoming calls from white list and address book will be received normally; Blacklists, text messages from strange numbers and incoming calls will all be blocked. Only accept whitelist: that is, whitelist text messages and incoming calls will be received normally, and blacklists, address books and strange numbers will be blocked. Accept all: blacklists, whitelists, address books, text messages and calls from strange numbers will be accepted.