A:Answer If you have a landline phone with a headset, 3.5mm jack, you would need to buy a bluetooth transceiver and connect it to the headphone jack, then pair the transceiver with the headset in bluetooth mode
Same for the computer, if it already has buetooth, just pair it with the headset in bluetooth mode, otherwise, plug the supplied dongle in to your computer and put the headset in wireless mode (not bluetooth)
You may need to adjust your PC's setting to send the audio to the headset if it doesn't switch there automatically.