We have no audio on zoiper, but other program works well.
The headset tested and working.
My system is Windows 10 and Dell Inspiron 17 3721.
Can you help me on remote desktop or team viewer connection?
Try going to Zoiper -> Settings -> Audio and click on the arrow buttons next to "Output device" and "input device". If you can hear the test tone and the microphone graph reacts to your voice, this means that your headset is recognised and works properly. In this case you are probably experiencing NAT related issue and you need to follow our troubleshooting article, here: https://www.zoiper.com/en/support/home/article/14/Missing_or_one_way_audio