So I just got this adapter. Level unbeatable price I think. The jack is difficult (I confirm what was said by another user). For a Cisco phone (IP 7941), we must reverse the mic / audio jacks for it working .. (not necessarily intuitive) And I think the description is missing one thing anyway! This is a MONO sound ... I bought in // headset for audio conferences, hoping just to be "isolated" thanks to sound in my ears 2, but in fact, I have the sound only one side! Not necessarily so annoying than that, but I find that ca would require to be clarified! If not, a priori means me well .. (but I think a lot depends on this part of the helmet with which you plug this product!)