The same Bluetooth accessory can not be registered again to the Gigaset handset?

• Please deregister other devices which were possibly registered to the handset before.
• - Bluetooth Menu
  - Known Devices
  - Select the accessory, e.g. a headset 
  - Options
  - Delete Entry

If it is again not possible to register the accessory to the handset, please check, whether the accessory supports a reset-function, and execute it. Please pay attention that perhaps previous settings will be deleted in the accessory.