Title: Plantronics DSP-400
Review: I am starting a call center using VOIP technology. Two of the headsets I purchased did not work out of the box. A third headset received audio from one ear only. I do however like the ease of access of the volume and mute control. I would not suggest using these in a space with more than a few agents. Clients can not hear the call. We switched to the Audio DSP 400 without the audio interface and this set seems to perform better.
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