docs: function Simulcast(options) {
  
      this.options = options ? options : {};
  
      if (!this.options.numOfLayers) {
          this.options.numOfLayers = DEFAULT_NUM_OF_LAYERS;
      }
      console.log("SdpSimulcast: using " + this.options.numOfLayers + " layers");
  
      /**
       * An IN-ORDER list of the simulcast ssrcs
       * @type {list<number>}
       */
      this.ssrcCache = [];
  }