Below are some suggestions to check and fix possible audio related problems. Just try whichever are applicable or you haven’t tried yet.
1. Double-check if your microphone/s and speaker/s are properly plugged-in, active, or turned on. Be sure that they are also not muted. You can also test them using other applications to make sure that they are working and not defective.
2. Download and install the most recent version of Skype. Issues, bugs, problems, and irregularities in older versions are often fixed or solved in the latest Skype version.
3. Update your audio/microphone/webcam drivers. You can use the Update Device Drivers function of your operating system, or visit the corresponding manufacturers’ site to check if there are new versions of drivers for your devices.
4. Download and Install remaining updates for your Operating System.
5. Then click Tools >> Options >> General Audio Settings.
Now, if your Skype still doesn't work continue reading:
If the other party can’t hear you
Under Microphone, select the preferred microphone device that you want to use (there could be one or more options available when you click the dropdown selection arrow). Check if the Volume Meter will respond when you make sounds.
You can also try to uncheck Automatically Adjust Microphone Settings and manually Adjust the volume to 80%-90% full.
If you can’t hear the other party with Skype
Under Speakers, select the preferred speaker/headphone device that you want to use (there could be one or more options available when you click the dropdown selection arrow). To test you speaker/headphone, click the check speakers option (green play icon) and check if the Volume Meter will also respond.
You can also try to uncheck Automatically Adjust Speakers Settings and manually Adjust the volume to 80%-90% full.
You can also click the Show Advanced Options to change the order of preference of the available microphone and speaker devices in your computer. For example; you place your external microphone on the top of the list, followed by your internal microphone. Skype will first look for your external mic, and will only use the internal mic of the external mic is not available or not plugged-in.
6. Call echo123, the Skype sound testing service to check if your mic and speakers are working. If both are working, you should be able to hear the automated voice and the recording of your own voice.
This should work on Microsoft Windows Vista, Windows 7 , Windows 8 , Windows 8.1 Blue but probably it will work on Windows XP too.
This is what users says:
ive done everything, i have audio in all other apps and even in my browser, the other side can hear me, but i cannot hear them, i dont even hear any ringing if i call them. Tried Skype test call and its all silent, no ringing sound, nothing