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Sennheiser Communications
 SupportHome » Support » FAQs » DW 800 telecom 
FAQ - DW 800 Wireless System
Why can't I hear any ringing tone in my headset when somebody tries to call me?

The ringing tone is only transferred to your headset if you connect your docking station through a TCI 01 box (optional accessory) to a phone that is equipped with one of the interfaces:
Mechanical handset lifter with ring tone detect
AEI interface
DHSG interface