An initial investigation has revealed the death of an eight-month-old baby on Thursday was unlikely to have been caused by a triple zero outage on the Optus network .

A critical outage in the telco giant's network meant triple zero calls in South Australia, Western Australia and the Northern Territory were blocked, with the company announcing it had led to three deaths; a fourth was later confirmed by WA Premier Roger Cook.

One of the initial deaths announced by Optus was that of an eight-month-old baby boy in Gawler, north of Adelaide.

Opinion: Optus has many questions to answer after another staggering failure

The boy's grandmother had initially told police she had tried to call triple zero on her mobile phone after realising her grandson was not breathing.

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