BT is used here to connect to a cell phone. Not to a headset.
Yes, you can.
How to register / pair a Bluetooth headset to telephone.
Before you proceed in registering your Bluetooth headset to the base, note the following information:
Make sure that no Bluetooth device is connected to your Bluetooth headset. Refer to your Bluetooth headset’s operating instructions for proper procedure in pairing it to another device.
Only one Bluetooth headset can be connected and used to the base unit.
To register your Bluetooth headset follow this procedure:
Bluetooth headset: Set your Bluetooth headset to registration mode. (refer to the headset operating instructions.)
Refer to the headset’s operating instructions.
Press [ MENU # 6 2 1 ].
If your headset PIN is ” 0000 “, go to step 4.
If your headset PIN is not ” 0000 “, press [ CLEAR ], then enter your headset’s PIN. Typically, default PIN is “0000”.
Press [ OK ] then wait until a long beep sounds.
Press [ OFF ] or [EXIT].
When the Bluetooth headset is ready for use, the HEADSET indicator on the base unit lights up.