Upgrading from ISDN to VoIP in Australia: What You Need to Know

With the ISDN shutdown in Australia well underway, now is the time for businesses to switch to VoIP. Learn what’s involved, the benefits, and how to make the transition smooth.

Australia’s ISDN network is being phased out, and businesses across the country are being pushed to find a modern alternative. For most, the answer is VoIP (Voice over Internet Protocol) — a flexible, cost-effective, and scalable solution that fits today’s digital work environment. But if you’re still relying on an ISDN setup, you might be wondering what the switch actually involves.
In this article, we’ll break down what’s happening with ISDN in Australia, why VoIP is the natural upgrade, and how your business can move over with minimal disruption.

Table of Contents

• What Is ISDN and Why Is It Being Shut Down?
• Why Australian Businesses Are Moving to VoIP
• Key Differences Between ISDN and VoIP
• How to Transition from ISDN to VoIP
• Common Challenges and How to Avoid Them
• Real-World Example: An Aussie Business That Made the Switch
• Conclusion: Making the Move to VoIP with Confidence

What Is ISDN and Why Is It Being Shut Down?
ISDN (Integrated Services Digital Network) was once the standard for business phone lines in Australia, providing stable, high-quality voice and data services over traditional copper lines.
However, with the rollout of the NBN and the rise of internet-based services, Telstra and other providers have begun retiring ISDN services across the country. The final disconnection dates vary by location, but for most businesses, the switch-off is already in progress or completed.

Key reasons for the phase-out:

• Ageing copper infrastructure
• Higher costs to maintain
• Limited scalability and flexibility compared to internet-based options
• Alignment with global digital communication trends

Why Australian Businesses Are Moving to VoIP
VoIP uses your internet connection to make and receive calls, eliminating the need for legacy phone lines. It’s a smarter option for modern business needs.
Benefits of VoIP:

• Lower ongoing costs: No expensive line rental fees or call charges — especially for long-distance and international calls.
• Scalability: Add or remove lines as your team grows or changes.
• Remote flexibility: Make and take calls from anywhere using a softphone, desk phone, or mobile app.
• Feature-rich systems: VoIP platforms typically include features like voicemail to email, call recording, call forwarding, and auto attendants — features that would cost extra (or be unavailable) with ISDN.

Example:
A Melbourne-based legal firm switched from ISDN to VoIP and saved around 40% on their monthly communications bill, while enabling remote staff to stay fully connected via mobile devices.

How to Transition from ISDN to VoIP
Switching to VoIP doesn’t need to be complex — but it does require some planning. Here’s a general roadmap:
1. Assess Your Current Setup
Start by auditing your existing ISDN infrastructure: how many lines, what hardware you use, and what features you rely on.

2. Check Your Internet Connection
VoIP relies on stable internet. For most Australian businesses on the NBN, standard broadband is enough. For higher call volumes, consider a dedicated connection or QoS (Quality of Service) settings.

3. Choose a VoIP Provider
Look for an Australian-based provider that offers local support, customisation, and scalable plans that suit your needs.

4. Select Your Hardware
You can use existing IP-compatible handsets or upgrade to new VoIP-enabled phones. Alternatively, opt for a softphone setup and ditch desk phones entirely.

5. Port Your Numbers
You don’t have to lose your business numbers. Your VoIP provider can help port over your existing numbers during the switchover.

6. Train Your Team
Ensure your staff are familiar with the new system, especially if you’re adding new tools like call recording or mobile apps.

Common Challenges and How to Avoid Them

• Poor Call Quality: Usually due to weak internet or lack of QoS settings. Make sure your ISP supports VoIP traffic.
• Loss of Numbers: Always work with your provider to port numbers properly — don’t cancel your ISDN service until the porting is complete.
• Downtime During the Switch: A well-planned migration with testing and staged rollouts can minimise any interruptions.

Real-World Example: An Aussie Business That Made the Switch
Business: Small accounting firm in Brisbane
Challenge: They needed more flexible communication after transitioning to hybrid work but were still on an ISDN system.
Solution: Upgraded to a cloud-hosted VoIP solution with mobile integration.
Outcome: Saved $2,000 per year and improved client call handling by using automated greetings and voicemail-to-email features.

Conclusion: Making the Move to VoIP with Confidence
ISDN is on its way out, and for good reason. VoIP offers a modern, flexible, and cost-effective alternative that fits the needs of today’s Australian businesses — whether you’re a startup or a multi-site enterprise. By planning your upgrade now, you can avoid disruption, unlock powerful new features, and position your business for the future of communication.
Thinking about upgrading? Get in touch with the team at VoIP System Australia for personalised advice and a free consultation.