How numbering plan is achieved in modern telephony, Computer Engineering

Assignment Help:

How numbering plan is achieved in modern telephony? Give the structure with example.

The objective of numbering plan is to uniquely identify every subscriber connected to a telecommunication network. A numbering plan may be semi-open or open or may be closed. An open-numbering plan permits broad variation in the number of digits to be used to specify a subscriber in a multi exchange area or within a country. This plan is utilized in countries equipped extensively with non-Director Strowger switching systems. In these cases the numbering scheme is generally an exact image of the network structure changes. A semi-open plan permits number lengths to be different by almost one or two digits. Now, this scheme is the most common and is utilized in many countries involving India. In the Uniform numbering scheme or closed numbering plan, the number of digits in a subscriber number is not changed. An international numbering plan or world numbering plan has been explained by CCITT in recommendations of this E.160-E.163. For numbering reasons, the world is divided in zones as demonstrated in figure. Each zone is specified a single digit code. For the European zone two codes have been allotted due to the large number of countries in this zone. All international telephone number contains two parts as demonstrated in figure. The country code consists of one, two or three digits, the first digit being the zone code wherein the country lies. If an integrated numbering plan already covers a whole zone, the countries in which zone are identified through the single digit zone code itself.

The existence of world numbering plan places limit on the national numbering plan of all countries. The number of digits in an international subscriber number is restricted to an absolute maximum of 12. In practical, with a few exceptions, world numbers are limited to 11 digits. Accordingly, the number of digits available for a national numbering plan is 11-N, here N is the number of digits in the country code.

Generally, a national number consist of three parts as demonstrated in figure. The area or the trunk code specifies a particular numbering area or the multi exchange area of the called subscriber, therefore determine the routing for a trunk call and a charge for this. As per to CCITT international usage, a numbering area is identified such as area wherein any two subscriber use equal dialing procedure to reach any other subscriber into the network. An exchange code specifies a particular exchange in a numbering area. This determine the routing for incoming trunk call from other numbering area or for a call originating from one exchange and destined to other in similar numbering area. Subscriber line number is utilized to select the called subscriber line on the terminating exchange. In a CCITT terminology, the combination of the exchange code and the subscriber line number is termed as the subscriber number that is the number listed in the telephone directory.

1729_World Numbering Zones.png

FIG - World Numbering Zones

 

1323_International Telephone Number.png

FIG - International Telephone Number

 

2323_National Telephone Number.png

FIG - National Telephone Number


Related Discussions:- How numbering plan is achieved in modern telephony

Determine frequency of a dtmf phone, In a DTMF phone a dialling of 8 genera...

In a DTMF phone a dialling of 8 generates (A) 1336 Hz- 770 Hz                      (B)  1209 Hz - 1477 Hz (C)  1209 Hz- 941 Hz                     (D)  1336 Hz-852 Hz

Functions for various communication modes, Q. Functions for various communi...

Q. Functions for various communication modes? MPI offers both non-blocking and blocking send/transmitting and receive operations for all modes. Functions for various commun

Which network connects multiple company locations, A/An                net...

A/An                network is typically a company network that connects multiple company locations into a single network. (A)  local area                                  (B

Estimate the size of the state space, 1. The missionaries and cannibals pro...

1. The missionaries and cannibals problem. Three missionaries and three cannibals are on the left river bank, with a boat that can hold one or two people. If on either side of the

Explain data warehousing, data warehousing Data warehouse means  ...

data warehousing Data warehouse means  Subject oriented Integrated Time variant Non-volatile collection of data for management's decisions. It is h

Software Engineering, Software Engineering is a layered technology. Explain...

Software Engineering is a layered technology. Explain

How will these instructions perform?, Q. How will these instructions perfor...

Q. How will these instructions perform? Let's assume that above machine instructions are stored in three consecutive memory locations 1, 2 and 3 and PC contains a value (1) tha

Address translation with dynamic partition, Address translation with dynami...

Address translation with dynamic partition : Given figure shows the address translation process with dynamic partitioning, where the processor provides hardware support for

Computer systems architecture, Assume that you are working in a software co...

Assume that you are working in a software company as a programmer and a bank is your company's client. The Bank is a most popular and one of the leading banks in Malaysia. Your

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd