NBN Business Phone Systems in Australia
With Australia's copper PSTN network being progressively retired, NBN-ready VoIP and cloud phone systems are now the standard for Australian businesses. Find suppliers who specialise in NBN-based business phone systems — including migration from legacy PSTN and ISDN infrastructure.
Browse NBN business phone system suppliers below, or use the filters to narrow by system type or feature.
What is an NBN Business Phone System?
An NBN business phone system is a VoIP or cloud-based phone system that delivers voice calls over your NBN internet connection — replacing traditional phone lines that ran over Telstra's copper network. As Australia's copper infrastructure is progressively decommissioned, VoIP over NBN has become the default for business phone connectivity.
NBN business phone systems are functionally equivalent to any cloud or VoIP system — the "NBN" designation simply confirms that the system is designed to work optimally over NBN connections, and that the supplier can support businesses migrating from legacy PSTN or ISDN services.
Voice calls are delivered as data packets over your NBN connection — no separate phone line required. Quality depends on your NBN plan speed and quality of service (QoS) configuration.
Suppliers who specialise in NBN phone systems can manage the migration from your existing PSTN or ISDN services — including number porting, cutover planning and staff transition.
Retain your existing business phone numbers when migrating to an NBN phone system — suppliers manage the porting process from your current provider to the new platform.
Quality VoIP over NBN requires proper Quality of Service (QoS) configuration on your router and sufficient bandwidth allocation for voice traffic — reputable suppliers provide guidance on this.
For businesses retaining on-premises PBX hardware, SIP trunks replace traditional ISDN lines — connecting your existing PBX to the NBN for outbound and inbound calling.
NBN phone systems deliver the same feature set as any cloud or hosted PBX — auto attendant, call queuing, recording, voicemail-to-email and analytics.
Migrating Your Business Phone System to NBN
- Audit your current services: List all your existing phone lines, DDI numbers, fax lines and ISDN services before engaging a supplier — this determines what needs to be migrated or replaced.
- Check your NBN connection: Confirm your NBN plan provides sufficient bandwidth for your expected concurrent call volume. A general guide is 100 Kbps per simultaneous call — a business with 10 concurrent calls needs at least 1 Mbps dedicated to voice.
- Plan number porting: Porting business numbers takes time — plan this well ahead of any cutover date to avoid any period without your existing numbers.
- Hardware assessment: Decide whether to retain existing desk phones (many are SIP-compatible), replace with new IP phones, or move entirely to softphones and mobile apps.
- QoS configuration: Work with your supplier to ensure your router and network are configured to prioritise voice traffic — this is the most common cause of call quality issues on NBN.
Telstra has been progressively decommissioning its copper network infrastructure as part of the NBN rollout. If your business is still operating on PSTN or ISDN services, contact a supplier below about your migration options — the timeline for your specific area may be closer than you think.
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