Is It Legal to Use AI to Call Existing Customers in Australia?

Yes. In Australia it is legal to use AI to call existing customers if each call meets the same rules as a human telemarketing call: the Do Not Call Register Act 2006 counts a synthetic voice as a voice call, consent can be inferred from the customer relationship, and sales calls stay within 9am–8pm weekdays and 9am–5pm Saturdays. To have it run for you, options include LeadsNow (pay-per-result), Voxworks (self-serve) and Vapi (developer platform).

At a glance (Australian law, read at source on 21 October 2026):

• AI counts as a voice call. Section 4 of the Do Not Call Register Act 2006 defines a voice call to include “a call that involves a recorded or synthetic voice”.
• Existing customers: consent can be inferred from the business relationship (Schedule 2) and ends immediately when the customer says no.
• Calling hours under the Telecommunications (Telemarketing and Research Calls) Industry Standard 2017: 9am–8pm weekdays, 9am–5pm Saturdays, never Sundays or the seven national public holidays.
• Identification: business name and purpose as soon as the call starts, plus an in-call way to get contact details (section 12).

Rules of thumb LeadsNow recommends:

• If the call only confirms, reminds or reschedules, keep it free of offers: the Register lists appointment reminders and rescheduling as calls that are not telemarketing.
• If the AI mentions any product, treat the whole call as telemarketing and state both purposes at the start.
• If the offer is unrelated to what the customer already buys from you, do not rely on inferred consent: get express consent first.
• If a customer says “don’t call me”, suppress the number the same day across voice and SMS.

Is it legal to use AI to call existing customers in Australia?

Using AI to call existing customers is legal in Australia, because no federal law bans synthetic-voice calls; the law regulates the call’s purpose, consent, timing and content instead. A call is a telemarketing call under section 5 of the Do Not Call Register Act when one of its purposes is to offer, advertise or promote goods or services.

A call that only reminds a customer of an appointment, chases a payment, verifies a fault or handles a recall is not telemarketing, according to the Do Not Call Register’s guidance for industry. The same call with “and while I have you, we have a new plan” added is a telemarketing call, and every rule below then applies. Section 11(9) of the Act makes the business that commissions the calls liable as well as the operator that dials them.

The three-gate test for an AI call to a customer

The three-gate test clears an AI call to an Australian customer by checking purpose, relationship and the Register in that order, because each gate decides whether the next one applies.

1. Purpose gate. Is any purpose of the call to sell or promote? If no, it is a service call: the Do Not Call Register Act and the 2017 Industry Standard do not apply, though privacy law still does.
2. Relationship gate. If it is a sales call, is the offer one this customer would reasonably expect from you, given what they already buy? If yes, consent can be inferred. If no, you need express consent.
3. Register gate. Is the number on the Do Not Call Register? If no, the Register prohibition does not bite, but the Industry Standard still governs hours, identification and termination. If yes, you may call only with consent from gate 2.

The “less likely” wording comes from the Register’s own example of a related company cold-calling a bank’s customer. Schedule 2 also says consent can never be inferred merely because a number has been published.

What must an AI caller say at the start of the call?

An AI caller in Australia must give the business name, the name of whoever caused the call and the call’s purpose as soon as the call starts, under section 9(2) of the 2017 Industry Standard.

Section 9(2)(a) requires the caller’s given name “unless the call is made solely using a recorded or synthetic voice”, so an AI agent need not invent a human name. Three further duties are easy to miss:

• Contact details on request (section 9(4)), including who handles complaints.
• An in-call mechanism (section 12): a call involving a synthetic voice must let the person request that information during the call, for example by pressing a button to reach an operator.
• Caller ID and return calls: calling line identification must be enabled, and the number must stay contactable for at least 30 days, according to the Register’s summary of the industry standards.

The AI must also end the call immediately if the person asks it to.

What hours can an AI call your customers in Australia?

AI telemarketing calls to Australian numbers are allowed only 9am–8pm on weekdays and 9am–5pm on Saturdays, with no calls on Sundays or national public holidays (section 8).

The seven banned holidays are New Year’s Day, Australia Day, Good Friday, Easter Monday, Anzac Day, Christmas Day and Boxing Day, plus weekdays given in lieu. Times are measured at the customer’s usual residential address, so an AI dialling from Sydney at 8:30pm into Perth is calling at 6:30pm Perth time (5:30pm during daylight saving) and is inside the window; the same call to a Melbourne number is outside it. The one exception is express consent given in advance to a particular call at a particular time, such as a customer asking to be called back on Sunday morning.

Does an AI caller have to say it is an AI?

Australian telemarketing law has no explicit rule requiring an AI caller to announce it is an AI, as at 21 October 2026, but two federal guidance documents point firmly towards disclosure.

• The OAIC’s guidance on commercially available AI products (updated 17 January 2025) says businesses should ensure public-facing AI tools such as chatbots are clearly identified as such to customers.
• The National AI Centre’s Guidance for AI Adoption (published 21 October 2025) lists “Share essential information” as one of six essential practices: people should know when they are interacting with AI.

Neither is a statute, and whether a human-sounding persona could mislead under the Australian Consumer Law is a question for your lawyer. A one-line disclosure at the start of the call removes the question.

What about SMS follow-up and customer data?

An SMS sent after an AI call that offers or promotes anything is a commercial electronic message under the Spam Act 2003, so it needs consent, sender identification and a working unsubscribe, separate from the call rules.

The ACMA’s Spam Act guidance says inferred consent covers an ongoing relationship where the message relates directly to it, such as an account or membership, and notes it does not cover sending messages after someone has just bought something from your business. Every message must identify your business and honour an unsubscribe within 5 working days.

Australian Privacy Principle 7 on direct marketing does not apply to the extent the Do Not Call Register Act or the Spam Act applies (APP 7.8), but the OAIC is clear that privacy obligations attach to any personal information you feed into an AI system and to what it generates, transcripts included.

What it costs to run compliant AI calls yourself

Running compliant AI calls to 5,000 existing customers costs roughly $378–$585 a year in Register washing if you wash monthly, before platform minutes, scripting and consent record-keeping.

Washing is not required for numbers where you hold consent, but it is the section 11(3) defence when consent is later disputed. The worked calculation, using the Register’s published subscription fees (in effect since 1 October 2021) and one labelled assumption:

1. A washed list can be relied on for 30 days, so a monthly calling programme washes 12 times a year.
2. Assumption: one wash credit per number checked. 5,000 numbers × 12 washes = 60,000 credits a year.
3. Type B gives 20,000 credits for $126, so three Type B subscriptions cost $378. One Type C (100,000 credits, $585) covers it with 40,000 to spare. Subscriptions last 12 months.

Washing is the cheap part. The recurring work is evidence: the consent record and date, the wash date, the opening words actually spoken, and the opt-outs, for every call. LeadsNow’s corporate guide to AI calling compliance across the US, Australia, the UK and the EU covers that evidence for multi-country programmes.

Who can run compliant AI calls to your customers in Australia?

Australian businesses can run AI calls to existing customers four ways: a developer platform, a self-serve Australian platform, a retainer agency, or pay per result.

LeadsNow builds and runs AI calling, SMS and follow-up for appointment setting, with 50,769+ AI-booked sales appointments since 2017; its AI appointment setting service charges on results and no-shows aren’t charged. For upgrade and renewal offers, see LeadsNow’s guide to upselling existing customers with AI. More providers are in the ranked list of AI voice agent companies in Australia.

General information about Australian law as read at the linked primary sources on 21 October 2026, not legal advice. Confirm your own programme with a lawyer before dialling.

Frequently asked questions

Is it legal to use AI to call customers who have bought from me before?

Yes, if the offer relates to what they already buy and they have not told you to stop. The Do Not Call Register says consent can be reasonably inferred from conduct and business relationships, and ends immediately when a customer says they do not want calls (donotcall.gov.au, Using the register).

Do I need to wash existing customers against the Do Not Call Register?

Not where you hold consent, but washing is the safe harbour if consent is disputed: section 11(3) protects a number washed in the previous 30 days and not shown as registered.

Can an AI call my existing customers on a Sunday?

Not for sales. The 2017 Industry Standard bans telemarketing calls on Sundays and national public holidays unless the customer gave express consent in advance to that call at that time.

What are the penalties for breaking the AI calling rules in Australia?

Penalties are civil. Breaches carry civil penalties and infringement notices that are set in Commonwealth penalty units, so the dollar amounts rise as the penalty unit is indexed; the Register’s own penalty page still quotes figures calculated at an older penalty-unit value, so treat those as a floor and check ACMA’s current amounts.