Global Teck Worldwide Avaya Compatible Headset XS 820 w/Mute - Avaya IP Phones: J139, J169, J179, 1608, 1616, 9601, 9608, 9610, 9611, 9611G, 9620, 9621, 9630, 9640, 9641, 9650, 9670

No issues, seems fine with IP Phone 9608G

I would actually give this product 2 1/2 stars if it was possible. The headset is lightweight and setup/connection was simple and straight forward. That is where the positives end, unfortunately. The mouthpiece/microphone arm has no flexibility at all and sticks almost straight out leaving it far away from your mouth. The curvature of the headband is also not very ergonomic which (at least with the shape of my head) makes it difficult to find a comfortable position with which to wear it.Sound quality on my end was not terrible (not good either just passable), but those I spoke to on the other end of the calls complained of my voice being choppy and that the call seemed to be cutting in and out. While certainly not a high end headset, at about $80.00, I would expect a little bit better quality.