Establishing connection between a local and a central communications device central control unit initiating new link establishment by accessing call-back module in central device

摘要

The method involves initiating link establishment between the devices (KE-A, PBX) by entering a special call number at the local device (KE-A). A control unit (STE) in the central communications device activates a call-back module (M-RR) in the central device (PBX) and the link establishment is broken off and a new link establishment between the devices is initiated by the central control unit by accessing the call-back module. Independent claims are also included for the following: a communications system.