Panasonic KX-TD816JT Features Manual page 97

Level-6 Excepted Code Table
Location
1
2
3
4
5
[Explanation]
If your Toll Restriction Level is 6;
a)
You cannot make a call whose toll call number is "201", because the number whose
second digit "0" is one of the Denied Codes for Level 6.
b)
You can make a call whose toll call number is "800". Though the number whose second
digit "0" is one of the Denied Codes for Level 6, the number "800" is one of the Excepted
Codes for Level 6. The Excepted Codes override the Denied Codes.
Features Guide
Code
911
1911
800
1800
1.6 Originating Features
97