60 Aastra MBU 400 User GuideAdditional Features Additional FeaturesThis section describes other tasks you can perform, if required, on the MBU and theAastra 420d Handsets.Resetting the MBUIn order for handsets to register with the MBU you must press the RESET button onthe rear of the MBU. Each time you reset the MBU, the handsets must re-register.Make sure handsets are within range of the MBU to register properly.Note: When you reset the MBU, the MBU waits until active calls have beencompleted on the handsets before starting the reset process. If a registered handset isoff during an MBU reset, it reconnects when turned on as long as the MBU was notfactory defaulted.To reset the MBU:• Press and release the RESET button on the rear of the MBU (do not hold it down)On the front of the MBU, POWER lights steadily during a reset and I-NET flashes.When the reset is complete I-NET lights steadily, indicating the MBU is ready touse.Note: Check to be sure all handsets are registered (or reconnected) properly withthe MBU after the reset is complete.Manually Registering/De-registering a HandsetHandsets will usually register without any action on your part if they are close to theMBU 400 after a reset. If required, you can manually register and deregister ahandset. Make sure your handset is within range of the MBU.To register or deregister the handset do the following.1. In Idle mode, press OK z to display the Main Menu.2. Select Settings and press OK z.3. Select System settings, and press OK z.4. Select Handset settings, and press OK z.5. Select Register handset or Deregister handset and press the Yes softkey at theprompt.If registering, the handset prompts to be placed in its charger cradle so auto-registration can occur.Listing all Registered HandsetsTo view a list of all registered handset do the following.1. In Idle mode, press OK z to display the Main Menu.2. Select Settings and press OK z.3. Select System settings, and press OK z.4. Select Handset settings, and press OK z.