def enable_contactgroup_host_notifications(self, contactgroup):
        """Enable host notifications for a contactgroup
        Format of the line that triggers function call::

        ENABLE_CONTACTGROUP_HOST_NOTIFICATIONS;<contactgroup_name>

        :param contactgroup: contactgroup to enable
        :type contactgroup: alignak.objects.contactgroup.Contactgroup
        :return: None
        """
        for contact_id in contactgroup.get_contacts():
            self.enable_contact_host_notifications(self.daemon.contacts[contact_id])