OFFICIAL · Australian Regulatory Framework

ACMA in practice: CLI verification, alphanumeric Sender ID and the SMS Sender ID Register for SMS-A2P traffic into Australia

The Australian Communications and Media Authority (ACMA) administers the Australian numbering plan and the rules for sender identity under the Telecommunications Act 1997. Australia's distinctive requirement is the SMS Sender ID Register — operated under the Reducing Scam SMS Industry Code (C661:2024) so that carriers can block impersonators of registered alphanumeric IDs. 4notify routes over tier-1 direct interconnects with Telstra, Optus and Vodafone/TPG and washes every marketing send against the Do Not Call Register at the API edge.

Three Australian mobile carriers

Telstra

Market share: ~44% · P50: 2.6 s

Market leader; strongest tier-1 interconnect; preferred activation for regulated sectors and the widest regional coverage.

Optus

Market share: ~30% · P50: 2.9 s

SingTel Optus; good alphanumeric Sender ID acceptance across metro and regional networks.

Vodafone / TPG

Market share: ~22% · P50: 3.0 s

TPG Telecom; competitive metro coverage; growing regional footprint via network sharing.

ACMA numbering plan

+61 4xx — Mobile numbersThree carriers plus MVNOs; ACMA CLI verification chain required.
13 / 1300 / 1800 — Business numbersInbound business and freephone services; call centres and support lines.
Short code (e.g. 19xxxxx)Two-way SMS; brand and carrier registration; dedicated or shared.
Alphanumeric Sender ID (≤11 chars)Registered on the SMS Sender ID Register; ABN and brand evidence required.

Five-step ACMA + Sender ID Register compliance chain

  1. 01

    ACMA-aware onboarding + carrier agreements

    4notify operates as a recognised delivery partner and holds alphanumeric Sender ID agreements with all three carriers.

  2. 02

    Alphanumeric Sender ID registration

    Brands enrol Sender IDs on the SMS Sender ID Register. Required: ABN, trademark or brand evidence, sample message, use declaration. Activation: 5-10 business days.

  3. 03

    SMS Sender ID Register enrolment (Australia-specific)

    Registered IDs are protected so carriers block impersonators under the Reducing Scam SMS Industry Code (C661:2024). The distinctive Australian anti-scam requirement.

  4. 04

    Do Not Call Register washing

    Every marketing send is washed against the Do Not Call Register at the API edge; registered numbers are rejected before dispatch. Transactional traffic is exempt.

  5. 05

    STOP keyword handling

    Every commercial message carries a STOP unsubscribe; opt-outs are honoured within five business days under the Spam Act 2003.

Frequently asked questions

Do I need an Australian entity to send SMS into Australia?

4notify manages the tier-1 interconnects from EU infrastructure, but for the SMS Sender ID Register you provide an ABN or brand evidence. The register is the distinctively Australian anti-impersonation requirement.

What is the penalty for a Spam Act breach?

Under the Spam Act 2003 the ACMA can issue infringement notices and seek civil penalties for sending commercial electronic messages without consent, identification or a functional unsubscribe.

How long does Sender ID activation take?

Usually 5-10 business days. Telstra is fastest; Optus and Vodafone/TPG can take 1-2 days longer.

Start for free

Full ACMA + Sender ID Register compliance. Sender ID live in 5-10 business days. Support across Australian business hours.