code: def enable_contact_svc_notifications(self, contact):
          
          if not contact.service_notifications_enabled:
              contact.modified_attributes |= \
                  DICT_MODATTR["MODATTR_NOTIFICATIONS_ENABLED"].value
              contact.service_notifications_enabled = True
              self.send_an_element(contact.get_update_status_brok())
docs: Enable service notifications for a contact
          Format of the line that triggers function call::
  
          DISABLE_CONTACT_SVC_NOTIFICATIONS;<contact_name>
  
          :param contact: contact to enable
          :type contact: alignak.objects.contact.Contact
          :return: None