Working to Combat Robocalling

Update May 21, 2019 In 2018, the FCC issued an order (FCC 17-151) that allows service providers to block calls originating from numbers that are not valid under the North American Numbering Plan (NANP). As of May 21, 2019, we have started, exercising our right to block outbound calls from invalid numbers in a continued effort to combat robocalls. We are going to begin at the NPA level only (and a small handful of NPAs to start). Any domestic originating calls that contain an invalid NPA will be blocked with an ISUP 21-Call Rejected or SIP 403-Forbidden. Overview of Carolina Digital Phone’s...