Is PSTN Dead? What Businesses Need to Know About Modems, VoIP, and Telephony in 2025

 

For decades, businesses relied on the Public Switched Telephone Network (PSTN) to manage their phone communications. Whether it was for making calls, running fax machines, or connecting EFTPOS terminals, PSTN was the backbone of traditional business telephony.

However, as technology evolves, PSTN is being phased out globally and replaced by VoIP (Voice over Internet Protocol) and cloud-based communication systems. In countries like Australia and the UK, traditional landlines are being switched off, forcing businesses to adapt to modern alternatives.

So, what does this mean for businesses still using PSTN-connected modems and phone systems? Let’s explore the shift from PSTN to VoIP and what your business needs to do to stay connected.

 

 

1. What is PSTN, and Why Was It Important?

The Public Switched Telephone Network (PSTN) is the traditional, circuit-switched telephone network that has been used for over a century. It connects landline phones through copper wires and exchanges, enabling voice communication across long distances.

How PSTN Works:

• A phone call is transmitted as an analog signal over copper wires.
• The call is routed through a switching network at telephone exchanges.
• The connection remains active for the duration of the call.

 

PSTN’s Role in Business:

• Landline phone systems
• Fax machines
• EFTPOS machines
• Alarm and security systems

While PSTN was reliable, it is now considered outdated due to high maintenance costs, lack of flexibility, and limited scalability. This is why telecom providers worldwide are shutting it down in favour of digital solutions like VoIP.

 

2. Why Is PSTN Being Phased Out?

Many countries are replacing PSTN with modern alternatives like VoIP, SIP (Session Initiation Protocol), and cloud-hosted telephony. The reasons include:

• Aging infrastructure: Maintaining copper networks is costly and inefficient.
• Limited functionality: PSTN doesn’t support modern communication features like video calls, CRM integrations, and remote work setups.
• Internet-driven communication: Businesses are now using broadband and mobile networks for telephony.
• Cost savings: VoIP is significantly cheaper than traditional landline services.

 

PSTN Phase-Out Timeline

• Australia: PSTN is being phased out as part of the NBN rollout, with businesses required to migrate to VoIP or SIP-based systems.
• UK: Openreach plans to switch off PSTN by 2025, requiring all businesses to transition to digital communication.
• Other countries: Many telecom providers worldwide are ending PSTN services and encouraging VoIP adoption.

 

3. The PSTN to VoIP Transition: What It Means for Businesses

With PSTN disappearing, businesses must transition to VoIP or alternative digital telephony systems. But how will this affect operations?

Key Business Impacts:

• Landline phones: Traditional desk phones must be replaced with VoIP-enabled phones or connected via an ATA (Analog Telephone Adapter).
• Fax machines: Many businesses are switching to cloud fax solutions.
• EFTPOS terminals: Newer IP-based EFTPOS machines are replacing old PSTN-dependent devices.
• Alarm systems: Some security systems may require upgrades to support digital connections.

For businesses that still rely on PSTN, now is the time to upgrade to ensure seamless communication without disruptions.

 

4. Does Your Business Still Need a Landline in 2025?

With mobile and cloud-based solutions dominating business communication, do you really need a landline anymore? The answer depends on your specific requirements.

PSTN vs. VoIP vs. Mobile Solutions

Feature	PSTN	VoIP	Mobile
Technology	Copper-based, circuit-switched	Internet-based	Cellular network
Scalability	Limited	Highly scalable	Highly scalable
Call Features	Basic	Advanced (video, call forwarding, CRM integration)	Advanced (SMS, video calls, mobile apps)
Reliability	High but aging	Reliable with good internet	Reliable with good coverage
Cost	Expensive	Cost-effective	Varies based on plan

 

When a Business Might Still Need a Landline:

• Regulatory requirements (certain industries may require fixed-line services).
• Existing PBX systems that haven’t been upgraded to VoIP.
• Business locations with poor mobile reception where VoIP isn’t an option.

For most businesses, VoIP or mobile solutions are now the best choices.

 

5. Choosing the Right VoIP-Compatible Modem or Router

If you’re moving away from PSTN, you’ll need the right VoIP-compatible modem or router.

Features to Look For in a Business-Ready Modem:

• FXS ports (to connect analog phones via ATA adapters).
• SIP compatibility (supports VoIP services).
• QoS (Quality of Service) settings (ensures clear call quality).
• Failover capabilities (switches to mobile backup if internet drops).

Some of the best VoIP-compatible modems include:

• Grandstream HT801 ATA Adapter (for connecting old PSTN phones to VoIP).
• DrayTek Vigor2865 (for business-grade VoIP support).
• Ubiquiti UniFi Dream Machine (for businesses using cloud-based communication).

 

6. How to Transition Smoothly from PSTN to VoIP

 

Step-by-Step Guide:

1. Check with your ISP – Ensure your broadband supports VoIP services.
2. Assess your needs – Consider whether you need desk phones, softphones, or mobile apps.
3. Choose a VoIP provider – Look for business-grade VoIP solutions with good support.
4. Set up VoIP-compatible hardware – Invest in VoIP-enabled phones, modems, and adapters.
5. Port your phone number – Transfer your existing business number to your new VoIP system.
6. Test and train staff – Ensure smooth adoption with proper setup and training.

 

7. Common Questions About the PSTN Switch-Off

 

“Can I still use my old landline phone?”

Yes, but you’ll need an ATA adapter or a VoIP-enabled router.

 

“Will my fax machine and EFTPOS still work?”

Check with your provider for VoIP-compatible fax and EFTPOS alternatives.

 

“Is VoIP reliable?”

Yes, provided you have a stable internet connection and a quality VoIP provider.

 

Final Thoughts: Future-Proofing Your Business Telephony

The shutdown of PSTN is not just a technology shift—it’s a business opportunity to upgrade to a more efficient and cost-effective communication system. Moving to VoIP or cloud-based phone solutions ensures better features, lower costs, and long-term scalability.

Need Help Transitioning?

At Central Telecoms, we make switching from PSTN to VoIP easy and stress-free. Our expert team can help you find the best VoIP solutions for your business.

📞 Contact us today to future-proof your business communications! 🚀