Cant hear other party voice when whatsapp call

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Hello,

i have problem regarding my whatsapp call. i was incall with person A using whatsapp app desktop and it went quite well. i didnt end the call and went to other different place. then i tried to call that person A using my smartphone this time but i couldnt hear a single voice from the other party, only they can hear me. and this is only happening to person A which didnt happen to others in my contact number. please help me go through this


System Configuration: Android / SamsungBrowser 16.0