Unpleasant high-pitched beep when 2 users is meeting

Hello everyone, i am new here.

My problem when after started an audio or a video meeting; while 2 users is meeting, we hear a repetitive really unpleasant high-pitched beep.

Here is my code to send a meeting request in OutgoingInvitationActivity:

URL serverURL = new URL(“https://meet.jit.si”);
JitsiMeetConferenceOptions.Builder builder = new JitsiMeetConferenceOptions.Builder();
builder.setServerURL(serverURL);
builder.setWelcomePageEnabled(false);
builder.setRoom(meetingRoom);
if (meetingType.equals(“audio”)) {
builder.setVideoMuted(true);
}
JitsiMeetActivity.launch(OutgoingInvitationActivity.this, builder.build());
finish();

And here to accept the meeting request in IncomingInvitationActivity:

URL serverUrl = new URL(“https://meet.jit.si”);
JitsiMeetConferenceOptions.Builder builder = new JitsiMeetConferenceOptions.Builder();
builder.setServerURL(serverUrl);
builder.setWelcomePageEnabled(false);
builder.setRoom(getIntent().getStringExtra(Constants.REMOTE_MSG_MEETING_ROOM));
if (meetingType.equals(“audio”)) {
builder.setVideoMuted(true);
}
JitsiMeetActivity.launch(IncomingInvitationActivity.this, builder.build());
finish();

How to solve the high-pitched beep ?

Thanks.