Panasonic KX-T336 System Reference Manual page 1238

Boundary number is ranging from "000" to "200."
If "000" is entered in Speed Dial Boundary, whole system speed dialing
screen is used to register the System Account Codes.
If "200" is entered in Speed Dial Boundary, whole system speed dialing
screen is used to register a number for Speed Dialing.
After Speed Dial Boundary is determined, register System Account Codes
at "System-Speed Dialing-System" screen.
(2) Assigning Account Code Verified (ACV) Feature to the Extension
ACV command is used to assign Account Code Verified feature to each
extension user on a basis of COS No. for that extension.
When Account Code Verified feature is assigned "Yes" to COS No.2, the
account code entered is checked against the System Account Code List.
If match is found on the table, a call is completed, if not found, a call is
stopped and reorder tone is sent.
To program Account Code Verified feature, enter ACV command as follows.
Then enter "Y" to activate this feature, or enter "N" to deactivate this feature.
<Example>
; PRG>ACV AT<CR>
; Class of Service No. 01 ----------------- N
; INPUT>> Y <CR>
; Class of Service No. 02 ----------------- N
; INPUT>> Y <CR>
; Class of Service No. 03 ----------------- N
; INPUT>> Y <CR>
; Class of Service No. 04 ----------------- N
; INPUT>> $EOD <CR>
; PRG>
Input Format
(1)
Mode
S P B
(2)
Mode
A C V
Index Number
(1) None
(2)
Index Number
01 to 32
CR
Index Number CR
10-C-91
(21292)
Explanation
COS (Class of Service) Number