ENCRYPTION APPARATUS AND METHOD OF ADDITIONAL FUNCTIONS IN KEYPHONE SYSTEM

摘要

PURPOSE: An encryption apparatus and a method of additional functions in keyphone system are provided to limit execution of the additional functions by comparing encryption stored in an encryption storing part with encryption assigned to the addition function. CONSTITUTION: An encryption apparatus in keyphone system has a main control board(21) and a memory expansion board(20). The main control board(21) controls a keyphone system to provide desired service and limits and releases service for additional functions using encryption of the additional functions. The memory expansion board(20) increases memory capacity upon addition of additional functions to the main control board(21) and stores encryption information for comparison with encryption of the additional functions.