code: public Observable<Page<ExpressRouteCrossConnectionPeeringInner>> listAsync(final String resourceGroupName, final String crossConnectionName) {
          return listWithServiceResponseAsync(resourceGroupName, crossConnectionName)
              .map(new Func1<ServiceResponse<Page<ExpressRouteCrossConnectionPeeringInner>>, Page<ExpressRouteCrossConnectionPeeringInner>>() {
                  @Override
                  public Page<ExpressRouteCrossConnectionPeeringInner> call(ServiceResponse<Page<ExpressRouteCrossConnectionPeeringInner>> response) {
                      return response.body();
                  }
              });
      }
docs: Gets all peerings in a specified ExpressRouteCrossConnection.
  
  @param resourceGroupName The name of the resource group.
  @param crossConnectionName The name of the ExpressRouteCrossConnection.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the PagedList&lt;ExpressRouteCrossConnectionPeeringInner&gt; object