Welltech LP-388 Oct-12-2007 - Manual (Page 71)

LAN Phone 388 User’s Manual 70
(3) Digit Manipulation
add: Add a rule to drop or insert prefix digits of incoming call.
prefix: Set which prefix number to implement digit manipulation
rule.
drop: Enable or disable drop function. If this function is enabled,
Phone will drop prefix number on incoming call.
insert: Set which digit to insert.
delete: Delete a digit manipulation rule by index.