What happens when a call is blocked on a landline? Follow When we block a call we give them a "message" saying Nomorobo has blocked the call. If the caller enters the Captcha code, we push the call through to you. If not, the call is terminated. Related articles Can Nomorobo Landline block private or unknown callers? How can I allow a call Nomorobo is blocking to ring through? Test Robocall Report a Number How does Nomorobo Max Call Screening work?