TeamSpeak (and Skype) mute other sounds

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Hello! I have a persisting problem with TeamSpeak (and Skype). When I'm voice-chatting with someone those programms mute ALL other sounds. As soon as I'm calling someone or recieving a call, every other sound (videogames, music, youtube) is dead silent. I've searched the internet for help, but... TeamSpeak (and Skype) mute other sounds