System Functions and Features as of I7.9
Numbering Plan
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Numbering Plan
This Chapter features the different types of internal and external numbering plans
available in the various systems. It explains the differences between internal numbering
plans for the private network and external numbering plans for the public network. It
tells you what you need to know when creating numbering plans for each particular
network.
2. 1
Numbering Plan Identifiers
The numbering plan is used to analyse numbers and allocate them to an addressa-
ble destination. Two types of numbering plans (Numbering Plan Identification, NPI)
are relevant to the system:
•
The public network uses numbering plan identifier E.164, which is defined and
standardized by the ITU-T.
•
Private networks use numbering plan identifier PNP (Private Numbering Plan).
The internal numbering plan of a PBX or PINX is also of the PNP type, as is the
private numbering plan supplied by the public network provider.
PINX 3 is a virtual PINX (Centrex)
1)
Fig. 1
Numbering plan identifiers in the public network and in the PISN (in PINXs)
Numbers in a numbering plan are analysed with the aid of the Type Of Number (or TON).
1)
depends on the network provider
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