Optus failed to follow protocol after it only contacted WA Police late Thursday evening about an outage affecting triple-0 calls, and only informed them of less than 20 per cent of total cases in the state, the WA acting premier says.

The outage, which began on Thursday morning and lasted for 13 hours, meant around 600 calls to triple-0 in Western Australia, South Australia and the Northern Territory failed to get through.

Optus chief executive officer Stephen Rue told a press conference yesterday he only became aware of the issue after a customer contacted their call centre at 1:30 pm AEST Thursday.

Acting WA Premier Rita Saffioti says Optus contacted WA Police just after 9:00 pm AWST on Thursday, nine-and-a-half hours later, and informed them of 26 emergency calls that had not gone th

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