Telephone numbers in Norfolk Island Telephone numbers in Norfolk Island In Norfolk Island: Country code +672 was originally assigned to Portuguese Timor until annexed by Indonesia in 1975. It is also used for the Australian Antarctic Territory, whose numbers are in area code 1. The code was also used for Christmas Island and the Cocos Keeling Islands until October 1994 (encompassing area codes 2 and 4), when they were migrated to the +61 country code, under area code 091 (using exchange prefixes 62 for Christmas Island and 64 for the Cocos Islands). These numbers have since been migrated to 08 9162 and 08 9164 respectively.
Telephone numbering plan open numbering plan, however, imposing a maximum length of 15 digits to telephone numbers. The standard defines a country calling code ("country code") for each state or region which is prefixed to each national numbering plan telephone number for international destination routing. Private numbering plans exist in telephone networks that are privately operated in an enterprise or organizational campus. Such systems may be supported by a private branch exchange (PBX), which provides a central access point to the PSTN and also controls internal calls between between telephone extensions. In contrast to numbering plans, which determine telephone numbers assigned to subscriber