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101

Notes

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There are two main types of Dial Plan

used on Nortel systems, these are :-

CDP Co-ordinated Dial Plan

UDP Uniform Dial Plan

CDP is the most common dial plan used

in Meridian/CS1000 networks and

allows users purely to dial the Extension

number of any other user on the

network.

However on a large network this can

limiting due to the numbers in use and

to accommodate larger networks we

have UDP.

UDP adds extra digits into the Dial

stream to identify different locations. As

you can see from the diagram calling

sets within the CDP domain is fine and

only the Extension number is required.

However calling from London to Rome

needs extra digits to make the numbers

unique. Thus we add a Location code

for each different area. To tell the

system we are using a Location code so

it knows where to look in its Routing

tables, we prefix the Location with an

AC (Access code) usually AC2.

CS 1000 Rel 7.5 16/04/2013

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