code: public Observable<Page<SubscriptionMediaServiceInner>> listAsync() {
          return listWithServiceResponseAsync()
              .map(new Func1<ServiceResponse<Page<SubscriptionMediaServiceInner>>, Page<SubscriptionMediaServiceInner>>() {
                  @Override
                  public Page<SubscriptionMediaServiceInner> call(ServiceResponse<Page<SubscriptionMediaServiceInner>> response) {
                      return response.body();
                  }
              });
      }
docs: List Media Services accounts.
  List Media Services accounts in the subscription.
  
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the PagedList&lt;SubscriptionMediaServiceInner&gt; object