code: private void addQueryParams(final Request request) {
          if (muted != null) {
              request.addQueryParam("Muted", muted.toString());
          }
  
          if (hold != null) {
              request.addQueryParam("Hold", hold.toString());
          }
  
          if (coaching != null) {
              request.addQueryParam("Coaching", coaching.toString());
          }
  
          if (getPageSize() != null) {
              request.addQueryParam("PageSize", Integer.toString(getPageSize()));
          }
      }
docs: Add the requested query string arguments to the Request.
  
  @param request Request to add query string arguments to