Discuss ways in which the current telephone numbering plan can be extended to accommodate the rapid demand for more telephone numbers. (See if you can find some of the proposals coming from the telecommunications industry.) For each new numbering plan you discuss, show how to find the number of different telephone numbers it supports.
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Telephone numbering system has some design strategies so that no
one get the same number means unique number.This design strategies
varies from country to country. For example :in India:
Landline format =area code+number
Mobile number = country code+10 digit number
As we know with the increase in technology, demands are also
increases which need an extending plan:
1)Relocating the existing numbers for paging services and
re-allocating some of the numbers in the “7(0-3)X” levels for
mobile services.
for X = n digits can support numbers
2) Re-allocating numbers in the “4X” level for mobile services,
which will be able to release 5.6 million numbers to meet the
demand
for X = n digits can support numbers
3) Re-allocating vacant numbers in the “8(1-3)X” levels for
mobile services
for X = n digits can support numbers
4) Raising the threshold of utilisation rate for allocation of
additional numbers to network operators, which will be able to
release 2.42 million numbers to meet the demand
5) Releasing most of the Special Number Blockss1for normal
allocation, which will be able to release a maximum of 3.52 million
numbers to meet the demand