System for concurrently transmitting call set-up signals to a plurality of terminals

By providing a system comprising four system-parts like a GSM-handset, a DECT-handset, a pc and a switch with a detector for detecting a set-up signal originating from or sent to one of said system-parts and by in response to said detecting sending a signalling signal to at least an other system-part for either just generating an alert signal at said other system-part or establishing a further coupling between said one system-part and said other system part the system becomes more user-friendly, especially when said set-up signal comprises an indication code for indicating whether and to which other system-parts said signalling signal is to be sent.