Panasonic KX-TD308 Installation Manual page 214

Features
3-154
Extra Table
100 extra codes can be entered in one of Denied or Excepted Code
Table. There is a maximum of either 120 entries for Denied Code
Table or 105 entries for Excepted Code Table.
Applicable Denied and Excepted Code Tables depend on the
assigned toll restriction level of an extension as follows:
[Explanation]
Level 1: allows all calls.
Level 2: denies codes stored in the Denied Code Table for Level 2 except
the codes stored in Excepted Code Tables for Levels 2 through 6.
Level 3: denies codes stored in the Denied Code Tables for Levels 2 and 3
except the codes stored in Excepted Code Tables for Levels 3
through 6.
Level 4: denies codes stored in the Denied Code Tables for Levels 2
through 4 except the codes stored in Excepted Code Tables for
Levels 4 through 6.
Level 5: denies codes stored in the Denied Code Tables for Levels 2
through 5 except the codes stored in Excepted Code Tables for
Levels 5 and 6.
Level 6: denies codes stored in the Denied Code Tables for Levels 2 through
6 except the codes stored in Excepted Code Table for Level 6.
Level 7: allows intercom calls only.
Level 8: allows operator calls only.
Here is an example to explain the procedure for Toll Restriction
programming.