Apart from the use of numbering plans for telephone numbers, they are also used in routing of SS7 signalling messages as part of the Global Title. In Public land mobile networks, the E.212 numbering plan is used for subscriber identities (e.g. stored in the GSM SIM) while E.214 is used for routing database queries across PSTN networks.
The Numbering Plan Indicator (NPI) is a number which is defined in the ITU standard Q.713, paragraph 220.127.116.11.3. The NPI is used primarily in SCCP messages. As of 2004 the following numbering plans and their respective Numbering Plan Indicator values have been defined:
|5||maritime mobile||E.210 and E.211|
Numbering plan crisis hits services old and new. (telephone numbers and the North American Numbering Plan) (Column)
Jun 01, 1992; As discussed in this column last month, the growth and variety of new telecommunications services since divestiture has place...