Information Technology Reference
In-Depth Information
Ta b l e 1 4 - 4
E.164 Country Codes
Country Code
Country
86
China
20
Egypt
91
India
49
Germany
380
Ukraine
44
United Kingdom
81
Japan
52
Mexico
966
Saudi Arabia
The ITU website that lists country codes is located at
www.itu.int/itudoc/itu-t/ob-lists/
Each country divides its network into area codes that identify a geographic region or city.
The United States uses the North American Numbering Plan (NANP). NANP has the ad-
dress format of
NXX
-
NXX
-
XXXX
, where
N
is any number from 2 to 9 and
X
is any
number from 0 to 9. The first three digits are the area code. The address is further divided
into the office code (also known as prefix) and line number. The prefix is three digits, and
the line number is four digits. The line number identifies the phone.
An example of a PSTN address in the United States is 1-713-781-0300. The 1 identifies the
United States; the 713 identifies an area code in the Houston, Texas, geographical region.
The 781 identifies a CO in west Houston. The 0300 identifies the phone.
Another example of a PSTN address is 52-55-8452-1110. The country code 52 identifies
the country of Mexico. The area code 55 identifies the geographic area of Mexico City.
The office code 8452 and line number 1110 follow.
Other PSTN Services
The PSTN provides a suite of services in addition to call setup and routing:
Centrex
■
Vo i c e m a i l
■
Database services
■
Interactive voice response (IVR)
■
Automatic call distribution (ACD)
■
