Thanks to the 30 freely programmable keys incl. LED support, which can be assigned in two levels as with the Sensorfon ST 56 (IP), the STE 56 becomes a work relief for all those who have to manage a multitude of telephone numbers and functions. You can see at a glance which colleagues are currently speaking and can coordinate incoming calls perfectly. The STE 56 can only be operated in conjunction with Agfeo ST 56 and ST 56 IP system telephones. A maximum of three STE 56s can be connected to one system telephone. The total number of STE 56s that can be connected depends on the communication system used.