Information Resources and Technology Management


Data Element: INTERNATIONAL TELEPHONE NUMBER

You are invited to read the definitions of terms used in this data standard.

Name
International Telephone Number
Description
A number assigned to a person or place for the purpose of communicating by telephone in a geographic area that is not part of the North American Numbering Plan (NANP). The number is a combination of all (or a subset of) the following: International Access Code (IAC) or International Direct Dialing (IDD) prefix, Country Code, City (routing) Code, local area code, and local telephone number.    
Type IAC or IDD Prefix:   Character Field*

Country Code:          Numeric

City (routing) Code:  Character Field*

Local Area Code:     Character Field*

Local Number:         Character Field

* The "Character Field" data type is used to allow leading zeros in these data fields when required.

Syntax IAC or IDD Prefix:   NN, NNN, or NNNN, where each N represents a number from 0 through 9. A leading zero is required when the "011" access code is used.

Country Code:          N, NN, or NNN, where each N represents a number from 0 through 9. The first digit of the country code is always a number from 1 through 9; a leading zero is not permitted.

City (routing) Code: A one- to six-digit number (e.g., N, NN, NNN, etc.), where each N represents a number from 0 through 9.

Local Area Code:   NNN, where each N represents a number from 0 through 9.

Local Number:       Usually a four-, five-, or six-digit number (e.g.,  NNNN, NNNNN, or NNNNNN), where each N represents a number from 0 through 9. Local telephone numbers may include an area code and extend to eight digits or more. When applicable, a hyphen shall be used to separate the local telephone prefix from the local telephone number (e.g., NNN-NNNN or NNNN-NNNN).

Recommended Field Name IAC or IDD:         ACCESSCODE

Country Code:      COUNTRYCODE

City Code:            CITYCODE

Local Area Code:  LOCALAREA

Local Number:      TELEPHONE

Source
N/A
Historical Data

For information on past versions of this standard, contact the National Data Administrator, Branch of Data and Systems Services, Division of Information Resources and Technology Management.

Reference(s)

Part 270, FW 6, Data Management and Standards, has been superceded by Part 274, FW 2, Establishing Service Data Standards.

AT&T Country & City Codes - Complete worldwide list of Country Codes and City Codes.

Country Calling Codes - User friendly web site with "From/To" menu selections that identify the country calling code and, when applicable, a list of the cities that have city dialing codes.

American Computer Resources, Inc. - International directory of calling codes in alphabetical order.

Use Instructions
As of the approval date, this data element will be used in any new automated system, data set, database, or information application, including new Geographic Information System (GIS) data and applications. This data element will also be used in any major modifications to existing systems or versions of these data-related items that include telephone numbers in geographic areas that are not part of the North American Numbering Plan (NANP).

This data element standard should also be used for international facsimile (FAX) numbers, when applicable.

Service staff are strongly encouraged to utilize this data element in existing systems, data sets, databases, and information applications. Where existing systems and data-related items are not in compliance, they should be modified to achieve compatibility and implement this data standard.

The following United States territories and associated areas are not part of the NANP and require, at a minimum, an IAC or IDD prefix and a Country Code: American Samoa, the freely associated states of Micronesia and the Marshall Islands, and the trust territory of Palau.

Examples of international dialing codes when calls originate in the United States: American Samoa is  011 + 684 + the local number (city codes are not required); London (inner), United Kingdom is 011 + 44 + 171 + the local number (codes are required for specified cities).

The IAC or IDD prefix, Country Code, City (routing) Code, local area code, and local telephone number will be handled as separate data fields, and will not be combined in a single data field.

Phase
Adopted
Approval Date
January 24, 2001
Validation Date
January 18, 2011
Data Steward
National Data Administrator, Branch of Data and Systems Services, Division of Information Resources and Technology Management.

 


Last updated: February 5, 2013