def get_escalable_contacts(self, notification, escalations, timeperiods):
        """Get all contacts (uniq) from eligible escalations

        :param notification: Notification to get data from (notif number...)
        :type notification: alignak.objects.notification.Notification
        :param escalations: Esclations objects, used to get escalation objects (contact, period)
        :type escalations: alignak.objects.escalation.Escalations
        :param timeperiods: Timeperiods objects, used to get escalation period
        :type timeperiods: alignak.objects.timeperiod.Timeperiods

        :return: Contact uuid list that can be notified for escalation
        :rtype: list
        """
        cls = self.__class__

        # We search since when we are in notification for escalations
        # that are based on this time
        in_notif_time = time.time() - notification.creation_time

        contacts = set()
        for escalation_id in self.escalations:
            escalation = escalations[escalation_id]

            escalation_period = timeperiods[escalation.escalation_period]
            if escalation.is_eligible(notification.t_to_go, self.state, notification.notif_nb,
                                      in_notif_time, cls.interval_length, escalation_period):
                contacts.update(escalation.contacts)
                # And we tag this escalations as started now
                notification.already_start_escalations.add(escalation.get_name())

        return list(contacts)
Get all contacts (uniq) from eligible escalations

        :param notification: Notification to get data from (notif number...)
        :type notification: alignak.objects.notification.Notification
        :param escalations: Esclations objects, used to get escalation objects (contact, period)
        :type escalations: alignak.objects.escalation.Escalations
        :param timeperiods: Timeperiods objects, used to get escalation period
        :type timeperiods: alignak.objects.timeperiod.Timeperiods

        :return: Contact uuid list that can be notified for escalation
        :rtype: list