Identify the ordered service, supplier and responsibility boundary
Aussie Broadband presents SIP Trunks as a way to connect an existing PBX to Internet calling. Its current product page also says enquiries may be handled by Nexgen after its acquisition and that Nexgen invoices the resulting solution. Preserve the quoted seller, contracting and billing entity, product name, service identifier, number inventory, channel quantity, site, access service and support owner from the current order.
Do not merge SIP Trunks with Aussie Broadband single-line VoIP, Hosted Phone System, enterprise voice, wholesale voice or a legacy FaktorTel service. A product page, consultation, accepted quote, provisioned service, delivered handoff and completed call are different states.
Documented service facts
Reviewed 2026-10-27. Compare SIP trunk services →
SIP authentication
Not verifiedThe reviewed public SIP-trunk sources do not publish one universal authentication identity, secret, realm or source-address policy. The selected service handoff governs; BYO VoIP credentials are not transferred.
SIP registration
Not verifiedA universal REGISTER requirement, registrar, proxy, expiry, refresh and Contact policy were not established publicly for the selected trunk. Preserve the provider handoff and observed exchange.
Numbers and inbound delivery
DocumentedThe product supports transferred business numbers in most cases. Port completion, assignment, provider attempt, delivered number, PBX match and completed inbound call remain unverified.
Continuity and restoration
Not verifiedThe reviewed trunk records do not establish account-level failover, alternate destinations or established-call behavior. Public outage information and a fault ticket remain context, not restoration proof.
Access and serviceability
DocumentedThe July 2026 CIS requires an active Aussie Broadband NBN plan and says availability follows where that NBN connection can be supplied. The exact address, access order, lead time and delivered result remain unverified.
Codecs, RTP and audio
Not verifiedThe public SIP-trunk records reviewed here do not publish a universal codec, DTMF, packetization or media-port contract. SDP, RTP directions, decoding and audibility require call-specific evidence.
Fax
Not verifiedThe reviewed sources do not establish T.38, audio passthrough, fallback, gateway support or completed pages for one SIP trunk. Do not infer fax from an adapter or another voice product.
Transport, addressing and protection
Not verifiedTransport, firewall sources, TLS, certificate policy and SRTP were not established publicly for the selected trunk. General CGNAT guidance is not a trunk configuration contract.
Channels and simultaneous calls
DocumentedThe product says each SIP channel supports one simultaneous call; the CIS displays two-channel examples and allows additional channels. Ordered quantity, call starts, dialogs, PBX resources and bandwidth remain separate.
Emergency-service evidence
DocumentedAussie Broadband documents IPND emergency-service addresses and lists 000 across all phone services. Effective address, identity, callback, route, power, Internet and independent access remain unverified for the selected trunk.
Plans, pricing and term
DocumentedThe 1 July 2026 CIS publishes Basic and Premium channel examples, a two-channel minimum example, month-to-month service and possible equipment or installation costs. The current quote, order, taxes and later changes govern.
Administration and support
DocumentedThe CIS names MyAussie for usage and fault lodging; the business contact page separates sales, service delivery and technical support. A portal entry, ticket or restoration notice does not prove call recovery.
SMS and MMS
Not verifiedThe reviewed SIP-trunk sources do not establish SMS or MMS on trunk numbers, sender registration, API access, throughput, retention or price. Do not transfer messaging claims from another product.
Treat the current CIS and service handoff as separate records
The 1 July 2026 Critical Information Summary says the service adapts a customer-supplied fixed voice system and requires an active Aussie Broadband NBN plan. It also names equipment, plan, channel, support and commercial conditions. The same document describes an Aussie Broadband-supplied analogue-to-VoIP adapter in its access list while later saying available adapters are not mandatory, so the exact ordered architecture and installation record must resolve the apparent scope difference.
The public sources do not publish one universal proxy, username, password, source-address rule, REGISTER requirement or called-number format. Preserve the provider handoff exactly; never copy settings from BYO VoIP, another account, another supplier or a generic PBX template.
Keep access, NAT and SIP acceptance independently observable
The CIS makes an active Aussie Broadband NBN plan a service dependency and says call quality depends on the Internet connection. Ethernet or NBN access state, public addressing, routing, DNS, NAT, a sent SIP request, provider response and an accepted dialog remain separate evidence.
Aussie Broadband publishes a general process for opting an Internet service out of CGNAT or adding a static address, but that article is not a SIP-trunk requirement. Establish whether the ordered handoff uses registration, source-address trust, an adapter or another managed boundary before changing CGNAT, port forwarding, firewall or PBX transport.
Separate channels, numbers, routes and media
The current product page says each SIP channel supports one simultaneous call; the CIS prices its displayed examples from two channels and allows additional channels. Ordered channels, configured PBX limits, offered attempts, active dialogs, call starts and completed calls remain different quantities.
Number assignment, port completion, provider delivery, the called-number value, PBX route match, answer, SDP, packet flow and audible two-way media also remain separate. The public SIP-trunk sources reviewed here do not establish a universal codec, DTMF, fax, RTP, TLS or SRTP contract, so those fields stay unverified until the selected handoff or support response supplies them.
Bound adjacent VoIP, porting and outage guidance
Aussie Broadband publishes BYO VoIP proxy and credential guidance for its VoIP service. That page is useful only as evidence that adjacent product settings exist; it must not be copied into a SIP-trunk PBX unless the provider explicitly binds the ordered trunk to those values.
The number-porting article says most ports take four to six business days and warns not to cancel the former service before the new one is working. That dated expectation is not a guaranteed cutover time. Likewise, a public Internet or mobile outage notice is context rather than proof that a particular trunk, number, route or media path is affected.
Make support, emergency readiness and commercial facts time-bound
The CIS directs usage review and fault lodging through MyAussie; the current business contact page separates sales, service delivery and technical support. Preserve the fault identifier, opened time, affected service, provider observations, changes, restoration claim and customer-side retest rather than treating a ticket or status page as resolution.
Aussie Broadband says IPND stores phone-service address data and lists 000 and crisis numbers across its phone services. Confirm that the selected trunk number has the intended effective emergency-service address, identity, callback and routing under the approved process; never place an uncoordinated 000 test. Prices, eligibility, plan inclusions, support hours and port timing are date-sensitive and must be rechecked against the current order and provider records.
Sources & applicability
Primary references for the technical details above. Operational examples and planning checklists are VoIP.info editorial guidance.
- Aussie Broadband — SIP Trunks ↗
- Aussie Broadband — SIP trunks Critical Information Summary, 1 July 2026 ↗
- Aussie Broadband — legal, Critical Information Summaries and service schedules ↗
- Aussie Broadband — SIP Trunks: guide to the business internet phone service, updated 27 August 2024 ↗
- Aussie Broadband — BYO VoIP settings, updated 14 September 2026 ↗
- Aussie Broadband — Integrated Public Number Database and emergency-service address, updated 26 August 2025 ↗
- Aussie Broadband — free crisis numbers for all phone services, updated 4 October 2023 ↗
- Aussie Broadband — phone-number port timing, updated 5 May 2023 ↗
- Aussie Broadband — port forwarding and CGNAT, updated 13 August 2023 ↗
- Aussie Broadband — current, upcoming and past outages ↗
- Aussie Broadband — report a fault in MyAussie, updated 26 February 2024 ↗
- Aussie Broadband — business support and service-delivery contacts ↗
Examples require adaptation to your topology. No live PBX or hardware testing is claimed.