3Com VCX V7122 User Manual page 51

Numbering Plans
Numbers are classified by their Numbering Plan Indication (NPI) and their Type of Number
(TON). The VCX V7122 supports all NPI/TON classifications used in the standard. The most
important NPI/TON values are as follows:
Table 16 NPI/TON Values
NPI
Unknown [0]
E.164 Public [1]
(ISDN)
Private [9]
3Com VCX V7122 SIP VoIP Gateway User Manual
TON Description
A valid classification, but one that has no information
Unknown [0]
about the numbering plan.
A public number in E.164 format, but no information
Unknown [0]
on what kind of E.164 number.
A public number in complete international E.164
International [1]
format. For example: 16135551234
A public number in complete national E.164 format.
National [2]
For example: 6135551234
A public number in complete E.164 format
Subscriber [4] representing a local subscriber. For example:
5551234
A private number, but with no further information
Unknown [0]
about the numbering plan
A private number with a location. For example:
Level 1 Regional [2]
3932200
Level 0 Regional [4] A private local extension number. For example: 2200
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