METHOD AND SYSTEM FOR ENABLING OF COMMUNICATION VIA EXCHANGE NETWORK, SAFETY NODE, METHOD FOR GIVING OF SAFETY FUNCTION TO EXCHANGE NETWORK, METHOD FOR PROCESSING OF ENCODED COMMUNICATION AND METHOD FOR GIVING OF SAFE COMMUNICATION

摘要

PURPOSE: To provide comparatively secure communication even when parties concerned of a call use a security device with different protocols and algorithms by placing a security node that explains a security signal received from a CPE before information is delivered to a called party in a non-encryption form. CONSTITUTION: A security node 150 placed to an electric communication network connecting a caller and a called party has a converter 151, a controller 152 converts received encrypted voice and data signals into information or non-encryption information encrypted by a different form in cooperation with the exchange 151 and conducts the inverse conversion. The controller 152 gives a control signal relating to the type of selected encryption used by the caller to the exchange 151. In the case of calling a hunt group, a proper encryption device such as 172 is selected and the controller 152 is used for the processing. The call signal is fed from the controller 152 to the exchange 151 through a conductor wire 168, and reverse communication, that is, communication from the called party 102 to the caller 101 takes the same path when the call path is once formed by the exchange 151 and an encryption device 172 in the return direction is used.