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LBI-39040 CONFIGURATION FILES

A user in class 0 calls “8564”. This call is not allowed since there is no entry in the table. Only numbers which are

explicitly defined in the table are allowed.

4.3. DISALLOW.DAT (TOLL CALL RESTRICTION)

Call restrictions are stored in two different files which are read upon startup of the PI: ALLOW.DAT and

DISALLOW.DAT. ALLOW.DAT and DISALLOW.DAT may be viewed and updated with the callres command. Please

refer to the callres command in section 6 for more details on file syntax.

The table of disallow entries contains phone numbers which may be disallowed for users in classes 0 to 14 . Class 15

users are not affected by the disallow table. Called numbers that the allow table permits must be checked to determine

whether they are denied by the disallow table.

The disallow file contains a table of phone numbers, each of which is followed by a field of 15 (0-14) Yes/No entries that

define whether the number is permitted or denied for the class.

Y Means the call is permitted for a class.

N Means the call is denied.

The disallow table (once it has been read in from a file and stored in the PI) works as follows when a call is placed and is

shown to be permitted by the allow table:

While NOT End Of Disallow Table

{

if (

called

phone number = = Disallow Number in table)

If there is an

in the table entry, the call is denied.

else

If there is a

under the user's class in the table,

continue to scan the table to make sure there is not another entry which would deny the call.

else

Go to the next entry in the table.

}

If the end of the disallow table is reached and no phone numbers in the disallow table match the called phone number,

then the call is allowed.

If a phone number in the disallow table matches the called phone number and there is an “N” under the user's class, then

the call is denied.

Table 15 - Sample Entries in the Disallow Table

In the allow table from the preceding section, users in classes 6 and 14 are allowed to make calls of the form

99?????????.

As an example of how the disallow table works, suppose a user in class 6 makes a call “99001234567”. The allow table

shows that the call is permitted because the last entry in the table is “99?????????”. Then, the disallow table is checked and

“99001234567” matches “9900???????”. Since class 6 is set to “N” in the disallow table the call is denied.

#Called

#Number

0 1 2 3 4 5 6

...

9900??????? NNNNNNN...Y

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 95 96

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