Executive Briefing
A detailed comparison of VoIP and traditional phone systems for business, covering call quality, features, costs, and migration considerations for Australian organisations.
Understanding Traditional Phone Systems (PSTN/PBX)
Traditional phone systems, also known as the Public Switched Telephone Network (PSTN), transmit voice signals over dedicated copper wires. Many businesses use a Private Branch Exchange (PBX) -- a physical on-premises box that manages internal extensions, call routing, and voicemail. These systems have been the backbone of business communication for decades and offer reliable, predictable call quality.
However, traditional systems come with significant limitations in 2026. They require dedicated hardware that is expensive to maintain and upgrade, offer limited mobility for remote or hybrid workers, and cannot easily integrate with modern business applications like CRM systems, email, or project management tools.
What Is VoIP and How Does It Work?
VoIP converts your voice into digital data packets and transmits them over the internet instead of traditional copper phone lines. Modern VoIP platforms go far beyond basic phone calls -- they offer a unified communications experience that combines voice, video, messaging, and file sharing in a single platform.
The technology works by digitising your voice using a codec (compression algorithm), breaking it into data packets, sending those packets over your internet connection, and reassembling them at the receiving end. All of this happens in real time, and with a decent internet connection, the call quality is indistinguishable from a traditional phone line.
Feature Comparison: VoIP vs Traditional Systems
Call Quality and Reliability
Traditional PSTN lines have historically been the gold standard for call quality, with consistent audio clarity and minimal latency. VoIP call quality in 2026, however, has reached parity with traditional systems when running on a stable broadband connection. HD Voice codecs used by modern VoIP platforms actually deliver wider frequency ranges than traditional phone lines, resulting in clearer, more natural-sounding calls.
The key difference is reliability. Traditional lines work during power outages (copper carries its own power), while VoIP depends on your internet connection and electricity. However, most VoIP platforms offer automatic failover to mobile phones, ensuring calls are never missed even during outages.
Features and Functionality
- Call management: Both systems offer call forwarding, voicemail, and hold. VoIP adds visual voicemail, voicemail-to-email transcription, call recording, and auto-attendants as standard inclusions rather than costly add-ons.
- Video and conferencing: Traditional systems require separate video conferencing equipment. VoIP platforms include built-in video calling and screen sharing at no extra cost.
- Mobility: Traditional desk phones tie you to your office. VoIP lets you make and receive business calls from your mobile phone, laptop, or tablet using your business number -- essential for hybrid and remote work.
- Integration: VoIP platforms integrate with CRM systems, helpdesk tools, Microsoft 365, and Google Workspace. This means call logs, contact details, and communication history flow automatically into your business applications.
- Scalability: Adding a new extension on a traditional PBX may require new hardware and technician visits. VoIP lets you add or remove users in minutes through an online portal.
Important Note
VoIP call quality depends heavily on your internet connection. For reliable VoIP, each concurrent call requires approximately 100 Kbps of dedicated bandwidth. A 10-person office with 5 simultaneous calls needs at least 500 Kbps reserved for voice traffic. Consider implementing Quality of Service (QoS) rules on your router to prioritise voice packets over other internet traffic.
Cost Comparison: The Real Numbers
Cost is often the deciding factor, and VoIP delivers significant savings for most businesses. Here is how the numbers typically compare for a 10-person Australian business:
Traditional PBX Costs
- Hardware: $5,000 to $15,000 upfront for a PBX system with 10 handsets
- Line rental: $30 to $50 per line per month (typically 2 to 4 lines for 10 users)
- Call charges: Local calls included, national and mobile calls $0.10 to $0.30 per call
- Maintenance: $500 to $2,000 per year for technician visits and repairs
- Estimated total (year 1): $8,000 to $20,000
VoIP/UCaaS Costs
- Hardware: $0 to $2,000 (optional IP handsets; many users use softphones on their computer or mobile)
- Per-user subscription: $15 to $45 per user per month, depending on the platform and plan
- Call charges: Most plans include unlimited national calling; international rates vary
- Maintenance: $0 (managed by the provider as part of the subscription)
- Estimated total (year 1): $1,800 to $7,400
VoIP Options for Australian Businesses
The Australian VoIP market in 2026 offers several mature platforms, each with distinct strengths. Here are the leading options for small and medium businesses:
- Microsoft Teams Phone: The strongest choice if your business already uses Microsoft 365. Teams Phone integrates directly into the Teams app your team already uses for chat and video. Add-on calling plans start from approximately $12 AUD per user per month on top of your existing Microsoft 365 licence.
- 8x8: A feature-rich UCaaS platform with strong Australian presence and local data centres. Plans start from approximately $20 AUD per user per month and include unlimited calling to selected countries.
- RingCentral: One of the largest global UCaaS providers with Australian data centres. Offers a comprehensive platform from approximately $30 AUD per user per month, with strong integrations and analytics.
- Zoom Phone: A natural extension for businesses already using Zoom for video conferencing. Australian calling plans start from approximately $15 AUD per user per month.
Making the Switch: Migration Considerations
Switching from a traditional phone system to VoIP requires careful planning to avoid disruption. Here are the key steps your business should follow:
- 1Test your internet connection: Run a VoIP quality test to check latency, jitter, and packet loss. Your connection should have less than 150ms latency, less than 30ms jitter, and less than 1% packet loss for reliable VoIP.
- 2Port your existing numbers: Number porting in Australia typically takes 1 to 10 business days. Start the porting process early and keep your old system running until the port is complete to avoid missing calls.
- 3Configure your network: Set up Quality of Service (QoS) rules on your router to prioritise voice traffic. If using wireless, ensure strong Wi-Fi coverage throughout your office or consider wired connections for desk phones.
- 4Train your team: VoIP softphones work differently from traditional handsets. Schedule a brief training session covering how to make and receive calls, transfer calls, set up voicemail, and use mobile apps.
- 5Plan for emergencies: Ensure your VoIP system is correctly configured for 000 emergency calls. Australian regulations require VoIP providers to support emergency calling, but you must verify your registered address is correct for location services.
Our managed IT team helps businesses across Sydney plan and execute their transition from traditional phone systems to modern VoIP platforms, ensuring zero missed calls during the switchover.
How We Researched This Article
This article was compiled using information from authoritative industry sources to ensure accuracy and relevance for Australian businesses.
Sources & References
- →Microsoft Teams Phone Documentation
Official Microsoft documentation on Teams Phone system features, calling plans, and deployment
- →Gartner UCaaS Market Guide
Independent analyst research on unified communications providers, market trends, and vendor evaluations
- →Australian Communications and Media Authority (ACMA)
Australian telecommunications regulatory authority overseeing VoIP provider obligations and emergency calling requirements
- →NBN Co -- National Broadband Network
Information on Australia's broadband infrastructure and its impact on business voice services
* Information is current as of the publication date. Telecommunications technology and pricing evolve regularly. We recommend verifying current recommendations with the original sources.
Frequently Asked Questions
Yes, on a stable broadband connection with adequate bandwidth, modern VoIP call quality is equal to or better than traditional phone lines. HD Voice codecs used by platforms like Microsoft Teams Phone and RingCentral deliver wider frequency ranges than PSTN, resulting in clearer conversations. The key requirement is a reliable internet connection with low latency and minimal packet loss.
Each concurrent VoIP call requires approximately 100 Kbps of upload and download bandwidth. For a 10-person office where up to 5 calls may happen simultaneously, you need at least 500 Kbps dedicated to voice traffic. Most NBN plans provide more than enough bandwidth, but you should also ensure low latency (under 150ms) and minimal jitter (under 30ms) for consistent quality.
Yes. Number porting is a standard process in Australia, regulated by the ACMA. You can port your existing landline and most 1300/1800 numbers to a VoIP provider. The porting process typically takes 1 to 10 business days. Your VoIP provider handles the porting request, and your old system continues to work until the port completes.
Yes. Australian VoIP providers are required by ACMA regulations to support 000 emergency calling. However, unlike traditional phones that automatically transmit your location, VoIP emergency calls rely on the registered address in your account settings. Make sure your VoIP provider has your correct office address on file, and update it if you move or have staff working from home.
Yes, and this is one of VoIP's biggest advantages. Most major VoIP platforms integrate with CRM systems (Salesforce, HubSpot), helpdesk tools (Zendesk, Freshdesk), Microsoft 365, and Google Workspace. These integrations enable features like click-to-call from your CRM, automatic call logging, screen pops with caller information, and unified communication history.