VoIP vs Landline: Which Is Better for Your Business?

The difference between VoIP and a landline is how the call travels: VoIP carries calls as data over the internet, while a landline uses dedicated copper phone lines. For business phone systems, VoIP is generally cheaper, more flexible, and richer in features, and it is increasingly the only forward-looking option as Australia retires its legacy copper network. A landline's main remaining advantage, working in a power cut, matters less than it used to.

Key facts

• VoIP carries calls over the internet; a landline carries them over dedicated copper phone lines.
• VoIP is usually cheaper, with lower call rates and no separate line rental.
• VoIP lets staff use their business number anywhere; a landline is fixed to one location.
• Australia's legacy copper network is being retired, so traditional landlines are being phased out.
• A landline keeps working in a power cut; VoIP needs power and internet, so it needs a failover plan.

What is the real difference between VoIP and a landline?

The fundamental difference is the path the call takes. A landline call travels over the copper phone network that has been in place for decades, a dedicated physical line from your premises to the exchange. A VoIP call is converted into data and travels over the same internet connection that carries your email and web traffic. Everything else, the cost, the features, the flexibility, flows from that one distinction.

Because a landline is tied to a physical line at a fixed address, it does one thing: connect that location to the phone network. VoIP, being software over the internet, is far more adaptable. The same system can serve multiple sites, follow staff to wherever they are working, and add features without new wiring. The copper line is simpler but rigid; VoIP is more capable but depends on a good internet connection.

Is VoIP cheaper than a landline?

For most businesses, yes. VoIP removes line rental, reduces or eliminates the cost of maintaining on-site phone hardware, and typically offers lower call rates, particularly for long-distance, international, and mobile calls. Instead of paying per line, you pay for a VoIP phone system and a SIP trunk sized to your needs, which usually works out cheaper than a comparable number of copper lines.

The saving grows with the size and spread of the business. A single landline for a one-person office is cheap enough, but once you have multiple lines, multiple sites, or remote staff, the cost and rigidity of copper add up quickly. VoIP scales more economically because adding capacity is a configuration change rather than a new physical line.

When might a landline still make sense?

A landline's enduring advantage is that it keeps working when the power and internet are down, because it draws power from the phone line itself. For a handful of critical uses, a lift emergency phone, an alarm line, an EFTPOS terminal in an area with unreliable internet, that resilience can still matter, though even these are increasingly moving to other solutions.

For general business calling, though, the landline's edge is smaller than it appears. A well-designed VoIP setup handles outages by diverting calls to mobiles automatically and, for phone-critical businesses, running a backup internet connection. And with the copper network being retired, holding onto landlines is a shrinking option rather than a long-term strategy. The practical question for most businesses is when to move to a SIP trunking solution, not whether.

Frequently asked questions

Are landlines being phased out in Australia?

The legacy copper network that traditional landlines run on is being progressively retired, with services moving to the NBN and other modern infrastructure. Traditional ISDN business lines in particular are being withdrawn. This is a major reason businesses are moving to VoIP now, on their own terms, rather than waiting to be migrated off copper at short notice.

Will a VoIP call sound as good as a landline?

On a properly set up connection, yes, and often better. VoIP call quality depends on having adequate bandwidth and a network configured to prioritise voice. With that in place, VoIP can carry higher-quality audio than a copper line. Poor VoIP call quality is almost always a network configuration problem rather than a limitation of VoIP itself.

What happens to VoIP in a power cut?

VoIP needs power and internet, so a power cut stops VoIP devices unless they are on backup power. This is the one area where a landline traditionally wins. The practical answer is a failover plan: calls divert automatically to mobiles when the office connection or power drops, so the business stays reachable even though the desk phones are dark.

Can we switch from a landline to VoIP and keep our number?

Yes. Your existing landline number ports to a VoIP system, including geographic, 1300, and 1800 numbers, usually within 10 to 20 business days. We manage the porting so your number keeps working through the transition. Switching to VoIP does not mean losing the number your customers already know.

If you are still on landlines and wondering whether now is the time to move, we are happy to look at what you have, explain what the copper retirement means for you, and lay out a sensible path to VoIP.