Your question about SiemensOptiset E headset plus adaptor

The offered product enables the connection of a maximum of two headsets and presents users the following features

• Intended for the connection to Optiset E advance, advance plus, Optiset E advance conference and memory
• Connectivity (2xRJ8) for two headsets via 121TR9-5
• Connectivity (RJ11) for 600 Ohm-digital recorder