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SIP Operation Manual
Long-Distance Control Table
This table controls the level of authority of an outgoing (transit out) call that is dialed through FXO
and diverted to PSTN network, as below
Descriptions:
Digit strings in this table are prefixes that the gateway will check on dialed numbers in
transit out calls.
This table is used to prohibit dialing any numbers started with specified prefixes.
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 from dialing 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.
