Embattled telco Optus has commissioned an independent review into the technical issues that caused last week's fatal triple-zero outage.

Optus has appointed Kerry Schott to lead an investigation into the botched firewall upgrade that affected more than 600 emergency calls and was linked to three deaths over 13 hours on Thursday.

Schott is currently a Director of AGL, Chair of the Carbon Market Institute and Chair of the Competition Review Panel.

The review will examine Optus' management of triple zero calls and actions in response to the incident in adherence to policies, procedures and legal requirements.

The report is expected to be completed before the end of the year. 

Optus admitted that five people had called their customer service line to report an issue affecting triple-zero

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