I have an Avaya 2410 (listed under compatible devices). The audio works decently, you can hear the sounds of phones. The microphone input does not work when using a regular stereo + microphone headset. I even tried moving the connector a little further to see if the mic connection was misaligned, to no avail. This should be a fixable solution if the manufacturer has specified what pin configuration you need if it is a connector input issue.
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