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To edit a tariff table, select it from the Select a tariff table drop-down list at the top-left of the screen. The table will then be loaded into the main editing window. This editing window is split into two halves, left and right.
The right-hand window contains all of the combinations of each valid dialling code for both national and international calls. Select between national and international dialling codes by clicking on the relevant option button in the Show dial codes for group. When selecting between the different dialling codes, the table below it is refreshed to include the new information.
Mobile numbers and other non-geographic numbers appear in the National table.
Each dialling code contains its partial prefix which allows the system to recognise the destination from the original dialled number, a location name (such as 'London'), a band name, and a code pattern. These are explained below.
| Dialling code | Description |
|---|---|
| Digits | Contains the most significant digits necessary to associate a dialled number to this dialling code. When determining the destination and cost of a dialled number, the system takes the first six digits of the number and attempts to locate it in the table. If it cannot, it takes the first five, and so on, until a match is found. |
| Location | Represents a geographical location name for the dialling code. |
| Band | The name of the tariff band that contains the properties (such as cost per minute) of any call to this type of number. |
| Code Pattern | A numeric mask used to validate a number of this type. For example, a London number (020 dialling code) requires a codepattern of 020########* which indicated that a London number, in order to be valid, must start with 020 and then be followed by at least eight numbers. If this code pattern is not matched, a call is discarded, as it could be the result of a misdial. |