VoIP Phone System: Cost, Features & Setup

What VoIP is and how it works for Australian businesses

A voip phone system converts voice into digital data packets that travel over your internet connection rather than traditional copper telephone lines. When you speak into a VoIP handset, desk phone app or mobile client, your voice is digitised, compressed and transmitted via IP protocol to the recipient, where it is reassembled into audible speech. This happens in real time with latency typically under 150 milliseconds on a properly configured network.

For Australian businesses, VoIP eliminates the need for separate voice and data infrastructure. Your Melbourne office, Sydney warehouse and remote workers in regional Victoria all connect to the same phone system through their existing internet service, whether that is NBN, fibre or 4G backup. The system itself—the PBX or private branch exchange—can run on a server in your office, in an Australian data centre or as a fully hosted cloud service.

VoIP works particularly well for businesses with flexible work arrangements; 68 per cent of Australian workers now operate under flexible arrangements, and a voip phone system allows remote staff to use the same extension, call routing and features as office-based colleagues. A sales representative working from home in Geelong appears to customers as part of the same switchboard as the head office in Melbourne.

The technology also supports unified communications, integrating voice calls with video conferencing, instant messaging, presence indicators and screen sharing in a single platform. A support query that begins as a chat message can escalate to a voice call and then a screen-share session without changing applications or losing context. For businesses evaluating platforms, understanding the difference between 3CX and Microsoft Teams clarifies which architecture suits operational requirements and existing Microsoft 365 investments.

Cost breakdown: licence, hosting, SIP trunks and calls

VoIP costs divide into four components: the software licence, hosting infrastructure, SIP trunk channels and per-minute call charges.

Software licence: 3CX prices by simultaneous calls rather than per user, making it substantially more affordable than per-seat hosted alternatives for businesses where not everyone is on the phone at once. An 8-simultaneous-call system supporting up to 40 extensions costs approximately USD 925 per year as at July 2026. A 16-call system suits 60–80 users, while enterprises with contact centre operations typically deploy 32, 64 or unlimited-call licences. The licence is a fixed annual cost regardless of how many staff you add, provided you stay within the simultaneous-call limit.

Hosting: You can run 3CX on your own server (capital cost plus maintenance), in an Australian data centre (AUD 40–80 per month for a managed virtual machine) or via a 3CX-certified hosting provider (AUD 60–120 per month including the hosting environment and system updates). Cloud hosting removes hardware refresh cycles and provides geographic redundancy, while on-premise deployment keeps voice traffic entirely within your network perimeter—a consideration for businesses with strict data residency requirements.

SIP trunks: These are the digital equivalent of phone lines, connecting your PBX to the public telephone network. SIP trunk channels cost AUD 10–18 per channel per month; for 8 simultaneous calls, budget AUD 80–144 monthly. Channels determine how many concurrent external calls you can make or receive—internal calls between extensions use zero trunk capacity.

Call charges: Local and national calls cost AUD 0.03–0.06 per minute depending on provider and plan. Mobile calls cost more, typically AUD 0.15–0.25 per minute. Many providers offer unlimited local/national call bundles for AUD 30–50 per trunk per month, which suits businesses with predictable high call volumes.

A worked example: a 20-person professional services firm with 8 simultaneous calls, cloud hosting and moderate call volume pays roughly AUD 925 annual licence (AUD 77/month) + AUD 80 hosting + AUD 120 SIP trunks + AUD 80 calls = AUD 357 per month total, or AUD 18 per user. Small businesses can reduce costs by up to 50 per cent compared with legacy PBX systems using this model.

Key features: call routing, recording, CRM integration and unified communications

Modern voip phone system platforms extend well beyond dialling and receiving calls. The features that deliver measurable business value are call routing, recording, CRM integration and unified communications capabilities.

Call routing directs incoming calls based on time of day, caller ID, IVR menu selection or agent availability. A caller pressing 1 for sales reaches the sales queue; pressing 2 for support routes to the support team with different ring strategy and overflow behaviour. Advanced routing includes skills-based distribution, geographic routing and priority queuing for VIP customers identified by CRM lookup. Well-designed routing reduces hold times, eliminates manual transfers and ensures the right person answers each call.

Call recording captures conversations for training, compliance and dispute resolution. 3CX records calls on demand, automatically for specific queues or extensions, or based on rules. Recordings are stored with metadata—caller ID, date, duration, agent—and indexed for search. Regulated industries including financial services and healthcare rely on call recording to meet Australian Privacy Act obligations and demonstrate compliance during audits.

CRM integration connects the phone system to your customer database, displaying caller details on screen before you answer and logging calls automatically against the customer record. 3CX integrates with Microsoft 365, Google Contacts and in-house directories for click-to-dial from CRM records, eliminating manual number entry and reducing misdials. For businesses using CRM automation, phone system integration triggers workflows: a missed call creates a follow-up task, a call over ten minutes flags the deal as high-value, or a support call opens a ticket automatically. This integration is a core element of customer relationship management strategy, turning call data into actionable business intelligence.

Unified communications combines voice, video, chat and presence in one interface. Staff see who is available, busy or in a meeting before calling; instant messages replace internal phone tag; video meetings launch with one click from a chat thread. For distributed teams, unified communications collapses communication friction: a project discussion moves fluidly from group chat to voice call to screen share as the conversation demands, without switching applications or losing context.

3CX vs cloud-only platforms: deployment options and total cost of ownership

Choosing between 3CX and cloud-only platforms like 8×8, RingCentral or Dialpad hinges on deployment flexibility, total cost of ownership and control over the environment.

3CX offers on-premise, private cloud and hosted deployment. 3CX provides a secure private solution with no data uploads to third parties when deployed on your own infrastructure, making it the preferred choice for businesses with strict data sovereignty requirements or complex integration needs. You own the licence perpetually (annual renewal maintains support and updates), choose your own SIP trunk provider to optimise call costs, and scale by purchasing a larger licence rather than renegotiating per-seat contracts. Total cost of ownership for a 50-user business over three years typically runs AUD 15,000–25,000 including licence, hosting and trunks, or AUD 100–140 per user per year.

Cloud-only platforms like 8×8, RingCentral and Dialpad operate as fully managed services with per-user-per-month pricing, typically AUD 25–60 per user depending on feature tier. These platforms captured about 71 per cent market share in Australia's small business unified communications market in 2025, driven by zero-touch deployment and bundled support. The vendor manages infrastructure, updates and availability; you consume the service like any SaaS application. The trade-off is less control: you cannot choose SIP providers independently, call data resides in the vendor's environment (which may include offshore data centres), and per-user pricing becomes expensive as headcount grows. A 50-user business pays AUD 1,500–3,000 per month (AUD 54,000–108,000 over three years), or AUD 360–720 per user per year.

Which suits your business? Choose 3CX if you need data residency control, have in-house or managed IT capability, want to optimise call costs through SIP provider choice, or expect to scale beyond 50 users where per-seat pricing becomes prohibitive. Choose a cloud-only platform if you lack IT resources, need instant deployment with zero infrastructure decisions, operate a small team (under 20 users) where per-seat costs remain reasonable, or value vendor-managed updates and support over deployment flexibility. For businesses already invested in Microsoft 365, comparing 3CX vs Microsoft Teams clarifies whether Teams Phone meets requirements or whether 3CX's richer call centre and routing features justify a separate platform.

Security, compliance and data residency in Australian VoIP

VoIP systems are network-attached services and inherit the same security risks as any internet-facing application: unauthorised access, toll fraud, eavesdropping and denial-of-service attacks.

Toll fraud occurs when attackers compromise a poorly secured PBX and make international calls at your expense, often racking up thousands of dollars in charges overnight. Mitigation requires strong SIP authentication, IP whitelisting to restrict access to known addresses, disabling international dialling for extensions that do not need it, and rate limiting to cap call spend per extension. 3CX includes built-in security features including automatic IP blacklisting after failed login attempts, but configuration discipline is essential—default passwords and unrestricted international access are the most common attack vectors.

Eavesdropping intercepts voice traffic to capture sensitive conversations. SIP traffic should be encrypted using TLS (Transport Layer Security) for signalling and SRTP (Secure Real-Time Transport Protocol) for media streams. On-premise deployments keep voice traffic entirely within your network perimeter, eliminating internet exposure for internal calls. Cloud-hosted systems must encrypt traffic end-to-end; verify that your provider supports TLS and SRTP and that Australian data centres are used for call routing.

Data residency matters for businesses handling personal information under the Privacy Act, which increased penalties to AUD 50 million for corporations in 2024. Call recordings, voicemail and chat logs are personal information; storing them offshore may breach privacy obligations or contractual commitments to customers. On-premise 3CX deployments store all data locally; cloud-hosted deployments should specify Australian data centre locations and confirm that backups remain onshore.

Compliance obligations include supporting Triple Zero (000) calls with location data and following ACMA regulations for consumer protection. Providers must support Triple Zero calls with location data and comply with ACMA consumer safeguards, including number portability and service reliability standards. Businesses should confirm that SIP trunk providers meet these obligations and that the PBX correctly passes location information for emergency calls—particularly important for multi-site deployments.

For businesses requiring integrated security and communications, Bestcomm's cybersecurity services and unified communications are delivered as one connected environment, ensuring VoIP security is designed into the deployment rather than retrofitted. Understanding identity and access management principles also strengthens VoIP security by enforcing least-privilege access to system administration and call recording archives.

How to choose and implement a VoIP system for your business

Choosing a voip phone system starts with defining requirements across five dimensions: team size and growth trajectory, call volume and routing complexity, integration with existing systems, deployment preference and budget.

Team size and growth: Count current staff, then project three years ahead. If you expect to grow from 15 to 50 users, per-seat pricing becomes expensive; 3CX's simultaneous-call licensing offers better economics. Map team size to simultaneous calls: a 20-person office where half the team is customer-facing typically needs 8–12 simultaneous calls; a 50-person contact centre needs 32 or more.

Call volume and routing: Businesses making hundreds of calls daily benefit from unlimited call bundles and advanced routing (skills-based queues, priority handling, overflow to mobile). Professional services firms with moderate call volumes and simple routing need less sophistication and pay less. List your routing requirements—time-based rules, IVR menus, queue callbacks—and confirm the platform supports them without custom development.

Integration requirements: Identify the systems your phone must connect to: CRM, helpdesk, Microsoft 365, accounting software. 3CX integrates with Office 365, Google Contacts and in-house directories; cloud platforms offer pre-built connectors to popular SaaS applications. For businesses with custom CRM systems or unique workflows, API availability and CRM automation capability determine whether integration is straightforward or requires software development effort.

Deployment preference: Choose on-premise if you need data residency control, have in-house IT capability or operate in a regulated industry. Choose private cloud hosting if you want control without hardware management. Choose fully hosted cloud if you lack IT resources, need instant deployment or operate a small team.

Budget: Calculate total cost of ownership over three years, including licence, hosting, SIP trunks, call charges and handsets (AUD 80–250 per desk phone, though softphone apps are free). Compare this to your current phone system cost—many businesses discover VoIP delivers richer features at lower cost, but the savings depend on deployment choice and call volume.

Implementation follows a structured path: audit current phone usage, design the new system (extension plan, call flows, integrations), provision infrastructure (hosting, SIP trunks, handsets), configure and test, train staff and migrate numbers. Number porting takes 10–20 business days in Australia; plan cutover for low-call periods and maintain the old system as backup for the first week. For businesses without in-house expertise, engaging a provider like Bestcomm that delivers unified communications, hosting and cybersecurity as one integrated service eliminates coordination overhead and unclear ownership across vendors.

Testing is non-negotiable: make test calls to every queue, verify CRM screen-pops display correct customer data, confirm call recording captures and indexes properly, and validate that remote workers on home internet achieve acceptable call quality. The 3CX mobile app extends the system to smartphones, allowing staff to make and receive calls on their business number from anywhere—test this thoroughly for remote and field workers.

Post-implementation, monitor call quality metrics (jitter, packet loss, latency), review call recordings for training opportunities, analyse queue statistics to optimise staffing and refine routing rules based on real usage patterns. A voip phone system is not a set-and-forget deployment; continuous improvement based on operational data delivers the productivity and cost benefits that justify the investment.