Panasonic KX-T336 System Reference Manual page 1053

Assigning Items
Doorphone Call Assignment
(cont.)
No.
Default
1 to 8 : Intercom group number for "ICM"
01 to 32 : pickup group number for "PICKUP"
1 or 2 : Attendant console 1 or 2
Three or four digits : directory number for "EXT"
9-G-25
Selection of Value
Continued
Reference