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 How can I allow a call Nomorobo is blocking to ring through? Can Nomorobo Landline block private or unknown callers? Test Robocall Report a Number How does Nomorobo Max Call Screening work?