What's the most cost effective way to use a Plantronics CS540 with a computer?

By adding the Discover D315 USB adapter, you'll be able to use your existing Plantronics CS540 headset and any wireless desk phone headset with your computer. That being said, you won't get remote call answering. So, if you need the ability to answer incoming calls when away from your desk then you'll want to order a compatible wireless headset for your computer instead.