Panasonic KX-T336 System Reference Manual page 219

The number that is registered in "Special Carrier
Access–OCC Access", Toll Restriction Table is
the number of the Area/Office Code Table.
(when virtual trunk group 5 is designated):
Special Carrier Access-OCC Access OFL PRG SCR SEL
OCC Access No.=1
Toll Restriction Table 8
Toll Restriction-Area/Office Code Tables
Area/Office Code Table No.=8 Entry=200
Trunk Group 05 Yes
OFL PRG SCR DIR
3-C-12
Programming <4>
System Programming
"System-Operation",
Home Dialing Plan
There are three types of dialing plans for local
and long distance calls. Each area has one of
the three plans as mentioned before.
Reference
VT Dumb
9-D-1.0010-C-4.00