Works with my Grandstream GXP2135. You hear me and I hear you. I bought one for myself so I tested it and planned to buy more for the rest of my colleagues once I confirmed it worked. Well, when I speak, I hear an annoying noise, let's not say an echo or feedback, but some kind of tinny hiss. So I decided to wait before buying more for my co-workers. It works and saves me from buying a $60+ headset, but I think I'll eventually tire of the noise and spend the extra money on a better quality kit.
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