ee.getReceivers()[0];

    for (const ssrc of await listenForSSRCs(t, receiver)) {
      assert_equals(typeof ssrc.senderCaptureTimeOffset, 'undefined');
    }
  }, '[' + kind + '] getSynchronizationSources() should not contain ' +
      'senderCaptureTimeOffset if absolute capture time RTP header extension ' +
      'is not offered');

  promise_test(async t => {
    const [caller, callee] = await initiateSingleTrackCall(
        t, /* caps=  */{[kind]: true}, /* absCaptureTimeOffered= */false,
        /* 