Telnyx

Overview

Telnyx 서비스 내용 정리

Number

NPA

NPA stands for Number Plan Area, commonly called Area Code. "NXX" refers to the three digits of a phone number immediately following the area code, also called the "exchange" or the Central Office Designation. Each DID is typically made up of NPA-NXX-FDN. The FDN(Fixed Dialer Number) refers to the 4 digits that follow the NXX.

자세한 내용은 이곳을 참조하자. https://en.wikipedia.org/wiki/List_of_North_American_Numbering_Plan_area_codes