In order to dial a number and reach the newly created destination, the administrator must put entries in the user’s numbering plan’s prefix access code table.
Every digit analysis starts with the dialing user’s PAC table, and stops there if a matching entry cannot be found. To create a new entry, here are some typical values:
The prefix digits. In as simple routing arrangement, only a few PSTN prefix digits may need to be defined (for example, for the US, 9 for local calls, 91 for national calls, and 9011 for international calls).Parent topic: PAC (Prefix Access Codes)
The minimum and maximum number of digits that must be dialed for this prefix, if the entry is to be matched. Note the same prefix digits can appear in the table twice, but with different, non-ambiguous, minimum and maximum lengths. For the examples of (a) the minimum and maximum for prefix 9 will be 8, for prefix 91 the minimum and maximum will be 11. For prefix 9011 the minimum and maximum would be a range.
Prefix type – for normal PSTN call routing, this is typically set to off-net access.
Digit position – indicates how many leading digits to delete before inserting the digits below.
Digits to insert – used to add prefix digits, for example to normalize the number before passing it to the e164 code table. In a simple prefix based PSTN routing scheme there is probably no need to modify the digit string at this point.
Nature of address – used to indicate the NOA (for example, international) of the resulting digit string. The e164 code table can select a destination based not only on dialed digits, but NOA, routing area, and class of service. So the value selected here can influence the final routing decision.
Destination type – for the prefix type off-net access can be BG Common Destination, E164 Destination, or none. None means the resulting digits will be processed in the user’s numbering plan’s destination codes table (below) BG Common Destination means that the resulting digits after modification wil be offered to the user’s business group’s common numbering plan and E164 Destination means that the resulting digits after modification will be offered to the E164 numbering plan.