For TwInnensechskant intercom systems with intercom traffic, microprocessor-controlled and with data protection function. It features a high-quality electret microphone, a dynamic receiver, a speaker for call signals, and a magnetic fork switch. The system provides optimal user guidance through illuminated function buttons and a night design. It includes call differentiation for door and floor calls, with 5 melodic ringtone variants selectable by the end user. The LED call display has a call memory function, and the volume can reach up to a maximum of 90 dBA with 4 adjustable volume levels. Additionally, it has a call disconnection switch, a call connection relay, and pre-wiring via a plug-in screw connection, ensuring that there is no interruption of the bus line when disassembling the device. The system supports various call numbers and offers a one-person setting procedure with programming protection as well as 3 slots for additional modules.