A list of CallingPoint objects.

        This is the list of all subsequent calling points for the service,
        including all associated services if the service splits into multiple
        services.

def subsequent_calling_points(self):
        """
        A list of CallingPoint objects.

        This is the list of all subsequent calling points for the service,
        including all associated services if the service splits into multiple
        services.
        """
        calling_points = list()
        for cpl in self._subsequent_calling_point_lists:
            calling_points += cpl.calling_points
        return calling_points