Australia voice guidelines
Voice calling guidelines for Australia (AU), covering reachability, caller ID formats, DTMF support, and emergency services.
Locale overview
| Field | Value |
|---|---|
| Country | Australia |
| ISO code | AU |
| Region | Asia-Pacific |
| Dialing code | +61 |
Reachability
| Call type | Inbound | Outbound | Notes |
|---|---|---|---|
| Domestic | Yes | Yes | Calls from AU numbers to AU destinations must route through the Sydney edge location |
| International | Yes | Yes | — |
| Toll-free | Yes | No | Toll-free numbers (1800, 1900) are inbound only; outbound origination is not supported |
Outbound restrictions
The following caller types are blocked for outbound calls:
- Anonymous calling numbers
- Unallocated +61 numbers not assigned by the Australian Communications and Media Authority (ACMA)
- Invalid international number formats
- Special service numbers (13, 1300, 1800, 1900) cannot be used as outbound caller IDs
Calls originating from Australian numbers to Australian destinations must be made by users located in Australia and use the Sydney edge location to prevent international gateway transit, which carriers may block. As of November 30, 2021, Telstra enforces caller ID validation; calls to Telstra subscribers must use a provisioned Australian phone number.
Caller ID
| Call type | Inbound format | Outbound format |
|---|---|---|
| Domestic | +E.164 | Local format |
| International | +E.164 | +E.164 |
| Toll-free | +E.164 | N/A |
DTMF support
DTMF tones are carried using RFC 2833 and are supported for both inbound and outbound calls.
Emergency services
Outbound calls to Australian emergency services numbers are supported.
Special requirements
- Geographic routing: Domestic calls that originate from Australian calling numbers to Australian destinations must use the Sydney edge location. Routing through an international gateway may result in carriers blocking the call.
Compliance note
These guidelines summarize carrier requirements at the time of publication and do not constitute legal counsel. Verify that your implementation complies with all applicable telecommunications regulations in Australia.