Telephone exchange equipment identifying telephone numbers during call - has identification unit and central processor scanning line sets

摘要

Two subscribers (Tn 1, Tn 2) are connected through their lines (T1), their exchange equipment (TS 1, TS 2), the exchange dialling equipment (W1) and a line set (LS). these connections can be for local or trunk calls. The central identification unit (1DZ) automatically identifies the caller's number (Tn 1). The central processor (RP) scans continuously and cyclically all engaged line sets (LS) and employs the central identification unit to identify the called subscriber. The information is stored for further processing and may be displayed. The collecting of this information may be initiated from a place remote from the caller's local exchange.