Survivable Branch Appliance
AudioCodes Enhanced Media Gateway 94 Document #: LTRT-18206
4.10.3 Numbering Plans and Type of Number
Numbers are classified by their Numbering Plan Indication (NPI) and their Type of Number
(TON). The Media Gateway supports all NPI/TON classifications used in the standard. The list of
ISDN ETSI NPI/TON values is shown in the following table:
Table 4-3: NPI/TON Values for ISDN ETSI
NPI TON Description
Unknown [0] Unknown [0] A valid classification, but one that has no information
about the numbering plan.
E.164 Public
[1]
Unknown [0] A public number in E.164 format, but no information on
what kind of E.164 number.
International [1] A public number in complete international E.164 format,
e.g., 16135551234.
National [2] A public number in complete national E.164 format, e.g.,
6135551234.
Subscriber [4] A public number in complete E.164 format representing
a local subscriber, e.g., 5551234.
Private [9] Unknown [0] A private number, but with no further information about
the numbering plan.
Level 2 Regional [1]
Level 1 Regional [2] A private number with a location, e.g., 3932200.
PISN Specific [3]
Level 0 Regional (local) [4] A private local extension number, e.g., 2200.
For NI-2 and DMS-100 ISDN variants, the valid combinations of TON and NPI for calling and
called numbers include (Plan/Type):
0/0 - Unknown/Unknown
1/1 - International number in ISDN/Telephony numbering plan
1/2 - National number in ISDN/Telephony numbering plan
1/4 - Subscriber (local) number in ISDN/Telephony numbering plan
9/4 - Subscriber (local) number in Private numbering plan
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