Award winning article

Telephone numbers in Castadilla

From IxWiki
Jump to navigation Jump to search
Castadilla telephone numbers
Map of Castadilla
Location
CountryCastadilla
ContinentSarpedon
RegulatorNCI
TypeClosed
NSN length9, 12, 15
Typical format0X-COE-xxxx, 0X-NPA-COE-xxxx
Access codes
Country calling code422
International call prefix00
Trunk prefix0

Telephone numbers in Castadilla are administered by the National Communications Institute of Castadilla.

The NCI divides the territories of its members into numbering plan areas (NPAs) which are encoded numerically with a three-digit telephone number prefix, commonly called the area code. Each telephone is assigned a seven-digit telephone number unique only within its respective plan area. The telephone number consists of a three-digit central office code and a four-digit station number. The combination of an area code and the telephone number serves as a destination routing address in the public switched telephone network (PSTN). For international call routing, the NCI has been assigned the international calling code 422.

History

Since at least the 1920s, the use of telephones have became widespread all across what would eventually become Castadilla. Of course, back then each of the Delepasian nations have had their own numbering plans with some even exclusively using letters of the alphabet in lieu of numbers. This led to the Great operators' strike of 1931 when operators went on strike due to them being exhausted from having to convert letters into the appropriate numbers. A direct consequence of this blackout was the establishment of the Delepasian Telephony Institute (now the NCI) in 1935 with the goal of regulating telephone numbers throughout the region to ensure easier communication and drastically reduce the burdens that operators had when converting these so-called "phone letters" into phone numbers. This meant that phones that exclusively dialed alphabetical letters were to be replaced by conventional numerical phones (although letterings were permitted via phonewords, this just meant that only numbers were to be dialed regardless). However, the numbering system would not be completely standardised into how it is structured today until the formation of the Delepasian Commonwealth in 1976.

Numbering plan

The NCI numbering format may be summarised in the notation 0X-NPA-COE-xxxx

Component Name Number ranges Notes
PN Prefix Number Code Allowed ranges: [1-3], and [7-9]. See Castadillaan number prefixes
NPA Numbering Plan Area Code Allowed ranges: [1–9] for the first digit, and [0-9] for the second and third digits. When the second and third digits of an area code are the same, that code is called an easily recognizable code (ERC). Each state of Castadilla has its own area code.
COE Central Office Exchange code Allowed ranges: [0–9] for the first digit, and [0–9] for both the second and third digits (however, the second digit of the exchange cannot be 0 if the first digit is also 0). Often considered part of a subscriber number. The three-digit Central Office codes are assigned to a specific CO serving its customers, but may be physically dispersed by redirection, or forwarding to mobile operators and other services.
xxxx Subscriber Number [0–9] for each of the four digits. This unique four-digit number is the subscriber number or station code.

For example, 01-404-235-5678 is a valid telephone number with area code 404 (Valió), central office prefix 235, and line number 5678. The number 01-404-009-5678 is invalid, because the central office code must not be in the form 00N. 01-404-159-2653 is invalid, because the office code must not begin with 1. 01-123-234-5678 is invalid, because the NPA must not begin with 0 or 1.

The country calling code for Castadilla is 422. In international format, a Castadillaan number should be listed as +42214045550100, where 404 is an area code, the trunk prefix is omitted, and 1 denotes a landline number.

Each three-digit area code has a capacity of 9,839,887 telephone numbers:

  • COE may begin with the digits [0–9], providing a base of 10 million numbers: (10 × 100 × 10000).
  • However, the first two digits of COE cannot both be 0, to avoid confusion with the 00N codes (subtract 100000).
  • Despite the widespread usage of COE 555 for fictional telephone numbers—see 555 (telephone number)—today, the only such numbers now specifically reserved for fictional use are 555-0100 through 555-0199, with the remaining 555 numbers released for actual assignment as information numbers (subtract 100).
  • The subscriber number may not be any of the four-digit special codes, to avoid confusion with them (subtract 13).
  • In individual geographic area codes, several other COE prefixes are generally not assigned: the home area code(s), adjacent domestic area codes and overlays, area codes reserved for future relief nearby, industry testing codes (generally COE 958 and 959) and special service codes (such as COE 950 and 976).

Area Codes

Here are the area codes within Castadilla:

Prefixes

The "0" is the trunk prefix. If an international call were to be made, the zero would be omitted.

  • 00 - Reserved for special numbers and codes
  • 01 - Landline
  • 02 - Mobile phone services
  • 03 - Mobile phone services
  • 04 - Reserved for future use
  • 05 - Reserved for future use
  • 06 - Reserved for future use
  • 07 - Special services
  • 08 - Special services
  • 09 - Premium services

Special numbers and codes

Some special numbers in the Castadillaan system:

  • 000 - Operator assistance
  • 0000 - Long-distance operator assistance
  • 00 - International access code using direct dial (for all destinations outside Castadilla)
  • 001 - International access code using operator assistance (for all destinations outside Castadilla)
  • 002 - Local community information or social services
  • 003 - City government or non-emergency police matters
  • 004 - Local telephone directory service
  • 005 - Traffic, road, and tourist information
  • 006 - Telephone line repair service, wireless operator customer service
  • 007 - Relay service for customers with hearing or speech disabilities
  • 008 - Non-urgent telehealth/teletriage services
  • 009 - Emergency telephone number - fire department, medical emergency, police
  • 0051 - A history of unanswered calls on a telephone number, useful for those who are not Caller ID subscribers.
  • 0057 - Used to trace harassing, threatening, abusive, obscene, etc. phone calls, and keep results of trace at phone company.
  • 0066 - To keep retrying a busy-line (see also Called-party camp-on)
  • 0067 - Caller ID Block
  • 0069 - Call Return caller may press '1' to return call after hearing number
  • 0070 - Cancel call waiting on a call-by-call basis
  • 0071 - Three-way calling, which lets a person talk to people in two different locations at the same time.
  • 0074 - Speed dial, which allows someone to quickly dial any of eight frequently called numbers using a one-digit code, from any phone on their line.
  • 0075 - Allows a total of 30 speed-call numbers with two digits.
  • 0077 - Activates Anonymous Call Rejection Service
  • 0082 - Releases Caller ID block on a call-by-call basis
  • 0087 - Deactivates Anonymous Call Rejection Service
  • 00315 - Common Videocom prefix
  • 00317 - Premium Videocom prefix

Retrieved from "https://ixwiki.com/index.php?title=Telephone_numbers_in_Castadilla&oldid=82210"