Panasonic KX-TD500 System Reference Manual page 1212

48.00 Account Code Verified (ACV)
Description
Account Code Verified is used to prevent the extension users from making
unauthorized outside calls by checking the validity of the entered account code.
In default mode, the validity of the entered account code is not checked by the
system.
When Account Code Verified is utilized, account code entered before making an
outside call is checked against the list of system account codes.
If the entered account code matches one of the codes on the list, the outside call is
completed.
If the entered account code is not found on this list, reorder tone is returned to the
extension user and the outside call is restricted.
System Account Codes for this feature can be registered by the ACC command.
This feature is applied to the extension user whose Class of Service No. is
assigned to "Y" by ACV command at dumb programming mode.
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
Mode
A C V
Index Number
Index Number
01 to 32
Index Number CR
11-C-86
Explanation
COS (Class of Service) Number