“Obviously,we’re asking all of our business customers irrespective of their size to contact either their direct account manager,or else our business care line,and we’re going through each customer’s concerns and we’ll continue to do that,” she said.

Telecommunications industry ombudsman Cynthia Gebert said her office could force payments of up to $100,000 for a business that could prove a loss and up to $1500 for individuals with a claim.

“If you can see a customer has clearly been impacted,we’d be encouraging them to really own the complaint and deal with it,” she said.

“But if we need to take a strong line with Optus to get the right outcome for their customers,that’s what we will do.”

Government figures are fuming about the way Optus has communicated about the outage.

Assistant Treasurer Stephen Jones said on Thursday that the communications minister was forced to “fill the gaps” asBayer Rosmarin took hours to make her first public comments on Wednesday while essential services such as rail networks and hospital hotlines shut down across the country.

Victorian Premier Jacinta Allan announced her governmentwould review its relationship with Optus after the outage halted Melbourne’s trains and blocked phone services at 11 hospitals,while NSW Premier Chris Minns urged the company to pay generous compensation.

“They’re going to have to come to the table and do something big,in my view,to keep their customer base and to prove to everybody that they are a reliable telecommunication service,” Minns said.

Australian Chamber of Commerce and Industry chief executive Andrew McKellar described Optus’ response as a “clown show” and predicted many of its 400,000 business customers would want financial compensation.

“Optus needs to do the right thing,” he said. The Greens-led Senate inquiry into the incident ensures the public fallout will drag on for Optus.

“We will force the Optus CEO and the executives of the giant telco to front up and explain what’s happened and what they are going to do to consider the losses,the impact that this has had on millions of Australians and what they’re going to do to make sure it doesn’t happen again,” Hanson-Young said.

The Coalition secured a deal to ensure the inquiry would also examine the federal government’s response.

Rowland announced her department wouldlaunch its own review into the incident.

“I think it’s really important to recognise that Australians,being reasonable people,understand that things sometimes go wrong,but they also have an expectation that large corporations will do the right thing by them when they suffer loss or inconvenience,” she said.

Opposition communications spokesman David Coleman said the government had been “clear as mud” on compensation and called on Rowland to explain publicly how people should access payments.

Legal expert and chief executive of the Cyber Security Cooperation Research Centre Rachael Falk said major corporations and government services such as train networks and hospitals could have clauses in their contracts with Optus that would force the telco to pay for damages.

“In many of the big contracts with government clients or big corporations,there are what is called service-level agreements around time the network is up and time networks are down,and that can result in damages being paid depending on the nature of those contracts to the customers who are impacted,” she said.

Small businesses are also looking at their compensation rights. Council of Small Business Organisations Australia chief executive Luke Achterstraat said it was the main question on the minds of organisations.

“Some small businesses are reporting they’ve lost as much as $10,000,” he said. “It’s not a question of if they get compensation,it’s a question of how much.”

Cut through the noise of federal politics with news,views and expert analysis from Jacqueline Maley. Subscribers can sign up to our weeklyInside Politics newsletter here.