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E.164 Numbering in the PSTN The E.164 Numbering Plan guaranties that every end-point can be reached globally from any other end-point Therefore the E.164 Numbering Plan has a hierarchical structure used for routing (and billing) Digit analysis in one network provides the route to the next network, to the area, to the destination office and to the subscriber line (e.g. CC - area code - office code - subscriber number) Service numbers and number portability have partially destroyed this simple routing scheme, but only on a national basis. To achieve this, national (non E.164) routing numbers are used. It is therefore NOT possible to route international calls directly from an origination network to a destination network. |