User Guide for the SIP-T48G IP Phone516. Tap OK to confirm the deletion or Cancel to cancel.System CustomizationsHeadset UseIf you want to use a wired headset, physically connect your headset to the phone and activate the headset modefor use.If you want to use a wireless headset, insert the Bluetooth USB dongle BT40 into the USB port on the back of thephone.This section provides an introduction to wired headset use.Note If both a Bluetooth headset and a wired headset are connected, only the Bluetooth headsetcan be used.Headset Mode Activation/DeactivationTo activate the headset mode:1. Press on the phone.The HEADSET key LED illuminates solid green, and the icon appears on the status bar of the touchscreen when the headset mode is activated. When you tap the line key or the Answer soft key to answeran incoming call, the call is connected to your headset automaticallyWith the handset on-hook, enter the desired number and tap Send, thephone will then place a call using the headset automatically.