<!doctype html>
<meta charset=utf-8>
<title>RTCRtpSender</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
  'use strict';

test((t) => {
    const pc = new RTCPeerConnection();
    t.add_cleanup(() => pc.close());

    const t1 = pc.addTransceiver("audio");
    const t2 = pc.addTransceiver("video");

    assert_not_equals(t1.sender.dtmf, null);
    assert_equals(t2.sender.dtmf, null);
}, "Video sender @dtmf is null");

</script>