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Long-Distance Control Table
This table controls the level of authority of an outgoing call through FXO.
If Level 0 (the highest level) is set to prohibit dialing any number started with prefix 0204, then any level
below 0 (including Levels 1 to 5) is also prohibited.
If Level 1 is set to prohibit dialing any number with prefix 0, then any level below 1 (including Levels 2 to 5)
is also prohibited. Since Level 0 is not restricted to any prefix, therefore at level 0 users can dial a number
with the prefix 0.
Note: Downward Restriction —If the users at a higher level cannot dial a number with a certain prefix,
then users at lowers level also cannot dial a number with the same prefix.
Long Distance Exception Table
This table handles any exceptions to the long-distance call table.
According to the Long Distance Control Table, users at Level 0 are prohibited to dial a number with the
prefix 0204. But, if the number 020488988 is set in the Exception Table as above, then users could then
dial this number.
Note: Upward Opening —If the users at a lower level can dial a number with a certain prefix, then the
users at higher levels can also dial a number with the same prefix.