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The North American Numbering Plan is a closed numbering plan, meaning that it assigns telephone numbers to individual endpoints based on a fixed-length telephone number. The national telephone number consists of a three-digit area code, a three-digit central office code, and a four-digit line number. Thus, each central office provides a ...
Local number portability (LNP) for fixed lines, and full mobile number portability (FMNP) for mobile phone lines, refers to the ability of a "customer of record" of an existing fixed-line or mobile telephone number assigned by a local exchange carrier (LEC) to reassign the number to another carrier ("service provider portability"), move it to another location ("geographic portability"), or ...
A key technical aspect of Mobile Number Portability (MNP) involves the routing of calls or mobile messages (SMS, MMS) to a number once it has been ported. Various call routing implementations exist globally, but the International and European best practice employs a central database (CDB) of ported numbers. Network operators replicate the CDB ...
Number Portability Administration Center. The Number Portability Administration Center (NPAC) is a function of the Federal Communications Commission (FCC) in the United States. It administers the routing of telephone calls and text messages (SMS) for the telecommunications industry and its customers in the regions of the North American ...
Porting Authorisation Code. Porting Authorization Code (PAC) is a unique identifier (normally 9 characters long and in the format "ABC123456") used by some mobile network operators to facilitate mobile number portability (MNP). This allows users to retain their mobile telephone number when switching operators.
Location routing number. A location routing number ( LRN) is an identification for a telephone switch for the purpose of routing telephone calls through the public switched telephone network (PSTN) in the United States. This identification has the format of a telephone number, in accordance with the North American Numbering Plan (NANP).
A telephone line is terminated at a telephone interface (fax modem) of a computer that runs fax server software. A set of digits of the assigned phone number is used to identify the recipient of the fax. This allows many recipients to have individual fax numbers while sharing only a few receiving interfaces (fax modems).
Voice over Internet Protocol (VoIP), [a] also called IP telephony, is a method and group of technologies for voice calls for the delivery of voice communication sessions over Internet Protocol (IP) networks, [2] such as the Internet. The broader terms Internet telephony, broadband telephony, and broadband phone service specifically refer to the ...