Hello Friendlyuser_507, welcome to the Microsoft community, I'll be happy to help you today;
If you hear phones ringing or voices on a voice call it means the problem is with the microphone of the user who is on the voice call with you;
Tell the other user who is on the voice call with you to enable Noise Suppression:
https://www.partitionwizard.com/partitionmagic/...
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After the user enables noise suppression check if you can still hear the background sounds;
See you soon!