Cvoice question 1

Which two codes together make up the number that follows the E.164 recommendation numbering scheme? (Choose two)

A. country code
B. subscriber code
C. national destination code
D. provider code

Answer: A B

Explanation

E.164 is an international numbering plan created by the International Telecommunication Union (ITU). Each number in the E.164 numbering plan
contains the following components:

Country code (CC)
National destination code (NDC - optional)
Subscriber number (SN)
The CC consists of one, two or three digits. It is what we add in order to access different countries and often prefixed with a +

The NDC is the code we often call the area code.

The SN is for telephone numbering. It is given by your phone operator.

E.164 numbers are limited to a maximum length of 15 digits.

For example, the North American Numbering Plan E.164 is as follows:

1-783-444-2222

+ 1: Country code
+ 783444: National destination code (for North American Numbering Plan, 783 is called the area code while 555 is called Central Office Code)
+ 2222: Subscribe Number

Answer C is also correct but just optional. E.164 Numbering Plan must have Country Code and Subscriber Code so A & B are the correct answers.