An inquest into an Adelaide woman's brutal murder has heard police were warned she was petrified she could be killed.

Zahra Abrahimzadeh was stabbed repeatedly by her estranged husband in front of hundreds of people at the Adelaide Convention Centre in March 2010.

Ten months earlier, Sandra Dunn from the Central Domestic Violence Service telephoned the police assistance line to report a possible breach of a restraining order.

She told the operator Mrs Abrahimzadeh had seen her brother-in-law and two other men in a car outside her home.

Ms Dunn told the operator "this woman is petrified that she's going to be killed".

The operator Kellie Van Dongren later transferred the call to the message bank of Port Adelaide police.

The court was told that under standard operating procedures a police patrol should have been sent to the address.