Traditional PSTN landline infrastructure in Australia has been progressively retired. With copper network and ISDN services now decommissioned, businesses that have not yet migrated to a cloud-based phone system are running on borrowed time – or already dealing with degraded call quality and no upgrade path.

Beyond the infrastructure reality, the business case for cloud VoIP has never been stronger:

• Remote and hybrid work – staff working from home, from the road, or from interstate offices can use the same phone system and extension number on any device, anywhere
• Cost reduction – no line rental for unused PSTN lines, competitive call rates, and free calls between internal extensions and locations
• Scalability – adding a new staff member means adding a software licence, not ordering a new PSTN line and waiting weeks for installation
• Microsoft 365 integration – for businesses already running Teams, a cloud VoIP system can integrate directly so staff make and receive calls from within Teams without a separate phone app
• Business continuity – cloud-hosted systems have built-in redundancy that on-premise PBX hardware cannot match

For a complete breakdown of the financial case for switching, read our guide: Why a Business VoIP Provider Saves More Than Money.

Why 3CX?

3CX is one of the world's most widely deployed business phone platforms, chosen by over 600,000 businesses globally because it combines enterprise-grade features with genuine flexibility – including a free tier for small businesses and unlimited scalability for enterprise deployments.

As a 3CX partner and managed service provider, Code Hyper One deploys, configures, and manages 3CX on your behalf – so you get the power of a world-class phone system without needing internal IT expertise to run it.

What 3CX delivers for Sydney businesses:

• Cloud-hosted PBX – your phone system runs in a data centre, not a server room. No hardware to fail, no software to patch manually, no IT staff needed to maintain it
• Any-device calling – staff make and receive calls on desk phones, desktop softphones, mobile apps (iOS and Android), or directly within Microsoft Teams
• Auto-attendant and IVR – professional call routing with customisable menus, greetings, and business hours handling – presenting even small businesses with an enterprise-grade phone presence
• Call queuing and ring groups – route incoming calls to the right team or department, with intelligent queuing so callers are never simply abandoned
• Call recording – record calls for training, compliance, and dispute resolution – stored securely in your Australian-based 3CX environment
• Voicemail to email – voicemails are transcribed and delivered to the assigned user's email inbox, so messages are never missed and can be searched and actioned from any device
• Video conferencing – built-in video meeting capability within 3CX, reducing reliance on separate conferencing subscriptions
• Real-time call analytics and reporting – live wallboards, call duration, abandoned call rates, and extension activity – giving managers genuine visibility into communication performance

VoIP call quality is determined almost entirely by the quality and reliability of the underlying internet connection. Residential NBN and shared broadband connections introduce packet loss, jitter, and latency – the three technical factors that make VoIP calls choppy, delayed, or dropped.

Code Hyper One pairs 3CX with TPG Telecom's dedicated fibre connectivity – a business-grade internet service with:

• Dedicated bandwidth – your internet connection is not shared with other businesses. The bandwidth you pay for is the bandwidth you get, consistently, including during peak hours
• Guaranteed SLAs – TPG Telecom business fibre comes with uptime SLAs and fault resolution commitments that residential NBN simply does not offer
• Symmetric speeds – equal upload and download speeds, which is critical for VoIP (your voice is uploading while theirs is downloading – asymmetric speeds create one-sided call quality problems)
• Low latency – fibre's physical properties deliver consistently lower latency than copper-based connections, reducing the delay in conversation that makes VoIP calls feel unnatural
• Australian routing – traffic stays on Australian infrastructure, reducing the latency introduced by international routing hops

For businesses needing to understand the technical requirements behind reliable VoIP, our QoS Configuration Guide for VoIP and Microsoft Teams explains exactly how we configure network Quality of Service to prioritise voice traffic on your connection. For business internet options, see our business internet services.

For Sydney businesses already running Microsoft 365, there is a powerful option that Smartcom and most pure-play telco providers cannot properly deliver: using Microsoft Teams as your business phone system.

Via Microsoft Teams Direct Routing or Microsoft Calling Plans, your existing Teams environment becomes a full-featured business phone system – staff make and receive external calls directly inside the Teams app they are already using for chat, video, and file collaboration.

Why this matters for M365 users:

• One app, everything – no separate softphone app, no separate phone number to remember. Your Teams identity becomes your calling identity
• Calling from any device – the Teams mobile app, desktop app, and desk phone (via Teams-certified handsets) all ring simultaneously
• Unified communications – voicemail appears in your Teams feed. Call history sits alongside your chat history. Contacts are your M365 contacts
• Licence efficiency – Teams Phone licences are integrated with your existing Microsoft 365 Business Voice or E5 licensing, avoiding duplicate subscription costs
• Managed from one dashboard – Code Hyper One manages both your Microsoft 365 environment and your Teams calling configuration, so you deal with one provider instead of a telco and an IT company separately

For businesses weighing 3CX against Teams Phone, the decision comes down to your existing infrastructure, user behaviour, and licensing position. Our IT consulting services can provide a platform-neutral assessment of which approach delivers the best outcome for your specific environment.

See our full Microsoft Teams services for context on Teams management beyond calling.

This is the section most business VoIP providers would rather you did not read.

VoIP infrastructure is a target. Toll fraud – where criminals gain unauthorised access to your phone system and make thousands of dollars of calls on your account, often overnight or on weekends – is one of the fastest-growing forms of business financial crime in Australia. SIP brute-force attacks, where automated tools try thousands of username/password combinations to access your VoIP system, happen continuously on every internet-exposed PBX.

A telco provider sells you a phone service. Code Hyper One secures the entire environment the phone service runs in.

VoIP security measures we implement as standard:

• SIP authentication hardening – strong credential policies and failed-login lockout on every extension, preventing brute-force access attempts
• Geo-blocking – restricting outbound calling to Australian and whitelisted international destinations, so even if an account is compromised, fraud calls to international high-cost routes are blocked at the system level
• Real-time toll fraud detection – spending threshold alerts that trigger automatically if unusual call volumes are detected, stopping fraud events before the bill reaches thousands of dollars
• Encrypted SIP trunks (TLS/SRTP) – call signalling and voice media are encrypted in transit, preventing call interception on shared network segments
• VoIP firewall rules – SIP traffic is restricted to known carrier IP ranges, blocking direct SIP registration attempts from the open internet
• Regular security audit of call logs – unusual patterns (calls to unusual destinations, calls outside business hours, extension registration from unexpected IP addresses) are reviewed as part of our ongoing management

These controls are standard in our VoIP deployments because our team approaches telephony the same way we approach every other part of your IT environment – as a security surface that needs active management. This is an area where pure-play telco providers have no capability and no interest.

For the broader security context around your business communications, see our network security services and email security offerings.

Auto-Attendant and IVR

Present a professional call experience from the first ring. Customisable greeting messages, business hours routing (calls handled differently inside and outside business hours), and multi-level menu options (press 1 for sales, press 2 for support) ensure every caller reaches the right person efficiently.

Call Queuing and Ring Groups

Inbound calls are distributed intelligently across available staff. Ring groups ring multiple extensions simultaneously or in sequence. Call queues hold callers with on-hold music and position announcements when all agents are busy – reducing abandoned calls and improving caller experience.

Call Forwarding and Failover

Never miss a call. Calls forward to a mobile when a desk extension is unanswered, escalate to a backup number when the primary is unavailable, and route to voicemail with a professional greeting when a team is outside business hours. For multi-site businesses, calls automatically fail over to an alternate site or mobile if a location's internet connection is disrupted.

Call Recording and Compliance

Record calls for quality assurance, staff training, and compliance purposes. Recordings are stored securely, searchable by date, extension, or number, and accessible to authorised managers through the 3CX management portal. For industries with regulatory obligations around call recording (financial services, legal, healthcare), we configure recording policies that meet your specific compliance requirements.

Voicemail to Email

Voicemail messages are converted to audio files and delivered to the assigned user's email inbox with a transcript. Staff working remotely, travelling, or between meetings can action voicemails from any device without calling into a voicemail service.

Live Dashboards and Reporting

Real-time wallboards show call queue depth, agent availability, average wait time, and abandoned call rates – giving managers live visibility during busy periods. Historical reporting covers call volumes by time of day, average call duration, extension activity, and missed call rates – the data you need to make staffing and routing decisions with confidence.

This is the question every business asks first: "Can I keep my existing phone numbers?"

Yes. Code Hyper One manages the complete number porting process, transferring your existing landline and 1300 numbers to the new VoIP system with zero gap in availability. You do not lose your numbers, your clients do not need to update their records, and the cutover happens during a scheduled maintenance window with the shortest possible disruption.

The porting process typically takes 5–15 business days depending on your current provider. During this period, your existing phone service remains live until the transfer is complete – there is no period where you are unreachable.

For a full explanation of how number porting works in Australia, read our guide: VoIP Number Porting Process: What Australian Businesses Need to Know.

For businesses needing new numbers – including new Sydney DID numbers, 1300 numbers, or VoIP numbers for additional locations – we provision these as part of the deployment. See our guide on VoIP Numbers in Australia for the full picture.

One of the first practical decisions in a VoIP deployment is whether staff use physical desk phones, software-based phones (softphones) on their computers or mobiles, or a combination of both.

Desk phones – hardware handsets from brands like Yealink, Fanvil, and Poly that plug into your network and register as extensions on the 3CX system. Best for reception, customer-facing roles, shared workstations, and staff who prefer the familiarity of a physical phone.

Softphones – the 3CX app installed on a Windows or Mac desktop, iOS device, or Android device. Best for mobile workers, remote staff, and office workers who are already at their computer for most of the day.

Microsoft Teams with Teams Phone – for businesses on M365, the Teams app itself becomes the softphone. Best for organisations where staff are already living inside Teams for chat and video.

Most Sydney business VoIP deployments use a mix: reception and management on desk phones, field and remote staff on softphones or Teams. We assess your team's working patterns and recommend the right combination for each role. For a full comparison, read our Softphone vs Desk Phone guide.

For hardware procurement of desk phones and accessories, our hardware solutions team sources and configures VoIP handsets as part of the same engagement.

The single biggest fear around switching to VoIP is disruption: dropped calls, lost numbers, confused staff, and a migration that takes weeks longer than promised. Here is exactly how Code Hyper One manages VoIP migrations for Sydney businesses to make sure none of that happens.

Step 1 – Current Environment Assessment We document your existing phone system: number of lines, extensions, call volumes, fax lines (if any), integration requirements, and current call costs. This tells us exactly what needs to be replicated, what can be improved, and what the migration timeline looks like.

Step 2 – Solution Design We design your 3CX configuration: extension layout, ring groups, call queues, IVR menu structure, voicemail settings, business hours routing, and integration points (CRM, Teams, etc.). You review and approve the design before any work begins.

Step 3 – Parallel Deployment We build and configure your new 3CX environment while your existing phone system remains live. Staff can be trained and softphones tested before the number transfer – eliminating the risk of a "big bang" cutover.

Step 4 – Number Porting and Cutover We initiate the port of your existing numbers and schedule the cutover for a low-traffic window (typically early morning or weekend). The transition is coordinated so there is no gap in call availability.

Step 5 – Training and Handover Staff are trained on the 3CX app and desk phones. We provide quick-reference guides for common features. For the first week post-cutover, our team is on standby to resolve any teething issues immediately.

Most Sydney business VoIP migrations are completed within 2–4 weeks from sign-off to live deployment.

If your business operates across multiple Sydney locations, regional offices, or a distributed remote workforce, cloud VoIP delivers capabilities that traditional phone systems simply cannot match.

• Single phone system, multiple sites – staff at Parramatta, CBD, North Sydney, and working from home all share the same extension directory, ring groups, and call queue
• Free inter-site calls – calls between extensions cost nothing, regardless of whether those extensions are across the office or across the country
• Consistent call handling – your IVR, call routing, and business hours rules apply uniformly, so callers get the same experience regardless of which location picks up
• Centralised management – one 3CX portal manages every site, every extension, and every call recording – no need to log into separate systems per location
• Business continuity – if one site loses internet connectivity, calls route automatically to another site or to mobile numbers, with zero manual intervention required

This integrates naturally with our disaster recovery planning and online IT support services – so your communication infrastructure is covered by the same monitoring, support, and recovery framework as every other system we manage.

Business VoIP is consistently less expensive than traditional PSTN services – but the savings depend on your current setup, call volumes, and the number of lines you are replacing.

Where the cost savings come from:

• Line rental elimination – PSTN lines cost $40–$80 per month each. VoIP extensions cost a fraction of that per user
• Call costs – local and national calls on VoIP plans are significantly lower per minute than traditional carrier rates, and calls between your own extensions are free
• Hardware capex reduction – cloud-hosted PBX eliminates the need to purchase and maintain on-premise PBX hardware (which typically costs $5,000–$30,000+ for a business system) and removes the refresh cycle entirely
• Maintenance – no on-site PBX maintenance contract, no hardware vendor relationship, no firmware updates managed in-house

Code Hyper One provides a fixed-price quote after the environment assessment – so you know exactly what you will pay before committing to anything. Pricing is per-user per-month for 3CX licences, with separate line items for TPG fibre and any hardware (desk phones).

For a detailed cost analysis framework, see our blog: Why a Business VoIP Provider Saves More Than Money.