code: function applySdpHack(sdp) {
      var parts = sdp.split('b=AS:30');
      if (parts.length === 2) {
          // increase max data transfer bandwidth to 100 Mbps
          return parts[0] + 'b=AS:102400' + parts[1];
      } else {
          return sdp;
      }
  }
docs: borrowed from https://github.com/HenrikJoreteg/RTCPeerConnection