Centrally-controlled telephone PBX - attaches additional stores to peripheral units to expand existing programs and associated functions

摘要

The telephone exchange allows new function to be added and old functions and system conditions to be modified (e.g. authorisation changes, call rerouting, conference sharing facilities etc.). Existing programs of various peripheral units can be expanded by attaching type-specific further additional stores and their associated further data stores to existing type-specific data stores and additional stores. Addressing is accomplished by supplementary addresses.