Exchange guaranteed to have same terminal identifier information as that of subscriber terminal equipment

An exchange of a communications system in which terminal equipment having its own terminal identifier information is connected to the exchange with a point to point configuration, a logical link is established conditional on a match, by a layer 2 procedure, of terminal identifier information before the link establishment, and thereafter call processing by using a layer 3 message is carried out, provided with:

• a layer 3 control unit by which the exchange per se generates a pseudo layer 3 global reception call and
• a layer 2 control unit which terminates the global reception call at the terminal equipment by the layer 2 procedure before the link establishment, extracts the terminal identifier information of the terminal equipment from a logical link establishment request frame sent from the terminal equipment in response to the termination, and notifies the terminal identifier information to the layer 3 control unit,
• the layer 3 control unit holding the terminal identifier information notified from the layer 2 control unit so as to use the same when later termination of a call to the terminal equipment occurs, whereby mismatching between respective terminal identifier information held in the exchange and terminal identifier information allotted to respective terminal equipment is avoided.