Most likely this is a microphone problem.

1.Check that your microphone/headset is properly plugged-in and switched on.

2.Check that your microphone/headset is correctly set up for your operating system.

Test your microphone to see that it works normally.

We recommend you test the microphone/headset with an internal windows sound recorder.

3.Check that your Raidcall is using the correct devices.

A.In Raidcall, open System Settings> Audio Settings> Output Devicesand check that the correct Input/ Output Devices is selected.

B.Input Device is for your voice transmission/recording, and you may have to tweak on it for sound if other people can't hear your voice.

C.Otherwise, you may have to change the output devices (speakers or headset) if you can't hear others speak.