The federal opposition has accused Communications Minister Anika Wells of misleading parliament over when her office was notified of the Optus Triple-Zero outage that has been linked to four deaths. It comes as emails that Optus sent to notify the government and the regulator of the outages, which ultimately affected more than 600 people last month, are scrutinised in Senate estimates. Meanwhile, legislation creating a triple-zero custodian has passed the lower house.