For CP200D, Mag-One BPR 40, and all Portable radios, the most common issue with the radio simply not working with a connected headset is that the cable is not pushed all the way and firmly clicked into the portable radio. This is very common even with seasoned pros and is most likely the culprit. To fix this issue, push the cable in as hard as you can. You will hear it click or pop into place. This needs to be done REALLY, REALLY HARD. Don't worry you will not break it. This snug fit is designed to keep the cable firmly locked in place and ensure that radio communication will not fail under extreme conditions.If this does not solve the issue please contact us and we will be happy to help troubleshoot further. We are alway here to help and make sure you are ready to go with reliable high-quality two-way communications.