SureTel
Business voice comparison guide
VoIP vs Cloud PBX vs SIP Trunking
Compare the main business voice options before choosing a phone setup.
- • South African business VoIP provider
- • Cloud PBX and SIP Trunking available
- • Yeastar, 3CX and Teams integration context
- • Practical voice and network support
Comparison guide · Not a quote · Licensed SA ISP · ICASA licence 0009/CECS/AUG/09
Answer first
VoIP, SIP, Cloud PBX and SIP trunking — in one paragraph
VoIP is internet-based calling, SIP is the signalling protocol behind many modern VoIP calls, Cloud PBX is a hosted phone system with extensions and call features, and SIP trunking supplies voice channels for an existing PBX or compatible platform. SureTel can provide all three and help compare the right voice option for your business. Compare Voice Options.
- VoIP
- SIP
- Cloud PBX
- SIP trunking
Summary
- • Explains VoIP, SIP, Cloud PBX and SIP trunking plainly
- • Helps buyers choose between hosted and existing-PBX options
- • Positions Cloud PBX for complete managed phone systems
- • Positions SIP trunking for compatible Yeastar, 3CX or existing PBX setups
- • Routes commercial visitors to the correct SureTel service page
Quick comparison
VoIP, SIP, Cloud PBX and SIP trunking side by side
Use this table to help buyers compare the options without forcing them into one answer too early. The page should show that these terms often work together.
| Term | Practical role | Best fit | What SureTel can help with | Main hand-off |
|---|---|---|---|---|
| VoIP | Internet-based calling service | Businesses replacing traditional voice services or reducing call complexity | Business VoIP, call rates, number porting, routing and support | business VoIP |
| SIP | Underlying signalling protocol used by many modern VoIP calls | Technical layer behind compatible devices, PBXs and trunks | Explain how SIP fits the solution without making the buyer manage protocol detail | SIP trunking explainer |
| Cloud PBX | Hosted business phone system with extensions and call features | Businesses wanting a complete managed phone system | Extensions, call routing, mobile apps, queues, recordings, Teams options and support | SureTel Cloud PBX |
| SIP Trunking | Voice trunks/channels for an existing PBX or compatible platform | Businesses keeping Yeastar, 3CX or another compatible PBX | SIP trunk setup, channels, porting, routing, compatibility and provider support | SIP trunking |
Note: These options are not mutually exclusive. A business may use Cloud PBX with VoIP, or an onsite PBX with SIP trunking and VoIP.
Problems this solves
Where terminology confusion becomes a business problem
Business phone terminology can be confusing when suppliers use VoIP, SIP, hosted PBX and Cloud PBX in different ways. This section shows why the distinction matters before requesting pricing.
The buyer does not know what to ask for
They may need a phone system, call service, SIP trunk or a full migration plan.
An existing PBX may still fit
A Yeastar, 3CX or compatible PBX may only need SIP trunking and support, not immediate replacement.
A hosted phone system may be simpler
Cloud PBX can reduce onsite PBX management and make remote or multi-branch calling easier.
SIP is confused with SIP trunking
SIP is the protocol layer; SIP trunking is the service used to connect calls through a provider.
Teams requirements are not scoped properly
Teams voice workflows need clear planning and should not be assumed by default.
Network readiness is ignored
Any voice option still depends on stable connectivity, router/firewall setup and support.
Which option do you need?
Match the option to your situation
This section turns the comparison into practical decision support. Use it to see which option fits your users, phones and PBX today.
Choose Cloud PBX if you want a complete managed phone system
Best for: SMEs, multi-branch teams, remote workers, businesses replacing an old PBX.
Includes: Extensions, call routing, mobile apps, recordings, queues and hosted PBX features.
Choose SIP Trunking if you are keeping a compatible PBX
Best for: Businesses with Yeastar, 3CX or another compatible onsite / private PBX.
Includes: Voice channels, number porting, outbound/inbound calling and provider connection.
Choose VoIP when the main need is business calling service
Best for: Businesses moving away from traditional lines or wanting internet-based calling.
Includes: VoIP call service, rates, numbers and support around the selected phone setup.
Compare options if you are unsure
Best for: Buyers who have an old PBX, unclear requirements or multiple branches.
Includes: Voice needs review, device/network check and recommendation.
Scope Teams integration if it is part of the workflow
Best for: Microsoft 365 / Teams users who want calling aligned to collaboration workflows.
Includes: Requirement scoping, compatibility review and routing considerations where relevant.
Mixed deployments are common in practice but depend on customer requirements. Do not assume every business should use the same mix.
Cost guidance
Approved pricing context — not a pricing page
This is a comparison guide, not a pricing page. Approved high-level pricing context appears below; detailed pricing intent hands off to the correct pages.
Cloud PBX
From R60 per extension per month excl. VAT, scaling down by user band where applicable.
VoIP calling
Call-rate context may be shown where approved; detailed usage depends on destinations, volumes and bundle fit.
SIP Trunking
Pricing depends on trunk/channel requirements, numbers, usage, routing and PBX compatibility.
DIDs and number porting
DIDs from R10 per DID per month excl. VAT and number porting from R40 per number once-off excl. VAT.
Hardware, network and setup
Costs may depend on phones, Yealink/3CX/Yeastar requirements, cabling, PoE, routers/firewalls, UPS and connectivity.
Final pricing depends on users, sites, call volume, hardware, connectivity, provider compatibility and support scope. All figures shown are excl. VAT.
Practical use cases
South African business examples
Short, realistic examples. Each card helps map terminology to a real decision.
Small office replacing old landlines
Likely fit: Cloud PBX + VoIP
Why: Hosted features, extensions, number porting and simpler support.
Business with a working Yeastar or 3CX system
Likely fit: SIP Trunking + VoIP
Why: Keep the PBX while improving voice provider setup and call routing.
Multi-branch business
Likely fit: Cloud PBX for central management, or SIP trunking where existing branch PBXs remain
Why: Depends on whether the business wants to standardise or keep site-specific systems.
Remote and hybrid team
Likely fit: Cloud PBX with mobile apps, softphones or Teams considerations
Why: Users need calling beyond the office desk.
Call centre or outbound team
Likely fit: SIP trunking, Cloud PBX or Hosted VICIdial depending on dialler and routing needs
Why: Concurrency, call reporting, recordings and routing must be scoped.
Teams-centred business
Likely fit: Cloud PBX or Teams integration path, depending on the desired workflow and platform constraints
Why: Collaboration and voice requirements must be aligned.
How the layers combine
Not mutually exclusive — how the layers work together
This lower educational section shows how the layers combine without repeating the top definition. Devices sit on a phone system, the phone system uses a signalling/service layer, and everything depends on the network beneath it.
| Layer | What sits here | Business meaning |
|---|---|---|
| User/device layer | Desk phones, DECT, softphones, mobile apps, Teams where relevant | How people place and receive calls |
| Phone-system layer | Cloud PBX, onsite PBX, Yeastar, 3CX or compatible PBX | How extensions, routing, queues and features are managed |
| Signalling/service layer | SIP, SIP trunking and VoIP provider services | How calls are set up and connected through a provider |
| Network layer | Fibre, wireless, LTE/5G backup, LAN, routers, firewalls and QoS | Whether calls work reliably in the real world |
The right voice setup is usually a combination of phone system, provider service, devices and network readiness.
Why SureTel
Guidance across the main business voice options
SureTel’s value on this page is guidance and implementation support across VoIP, Cloud PBX and SIP Trunking — not a claim to be the best provider.
VoIP, Cloud PBX and SIP Trunking
SureTel can provide business VoIP, Cloud PBX and SIP Trunking.
Hosted or existing-PBX guidance
SureTel can help compare whether a hosted or existing-PBX approach is better.
Devices and phones
Supports Yealink phones, DECT options, softphones and relevant device planning.
Network readiness
Can assist with router/firewall setup, QoS, cabling and connectivity where needed.
Setup and porting
Helps reduce red tape around setup, number porting and cut-over planning.
South African context
Understands South African voice, connectivity and support realities.
Advanced considerations
Teams integration and other advanced considerations
Teams can be part of a business voice strategy, but it should be scoped as a requirement rather than assumed by default. Keep detailed implementation decisions to a conversation with SureTel.
Teams integration
Useful where users already work heavily in Microsoft Teams and want voice aligned to collaboration workflows.
Direct Routing / SBC context
Advanced setups may involve session border controller and telephony trunk planning; not a one-click default.
Existing PBX integrations
Yeastar and 3CX may fit customers that need onsite control, CRM integration or specific device support.
WebRTC / browser calling
Can matter for selected Cloud PBX or softphone workflows.
Multi-branch routing
Requires extension plans, failover paths, numbering and consistent support ownership.
Security and fraud prevention
Scope alongside setup and support — see the VoIP security and fraud prevention guide.
Mistakes to avoid
Common misunderstandings — and better approaches
Help buyers avoid expensive misunderstandings without sounding negative.
| Mistake | Why it causes problems | Better approach |
|---|---|---|
| Treating VoIP, SIP and Cloud PBX as the same thing | Buyer may request the wrong solution | Compare the system, service and protocol layers |
| Buying SIP trunks without a compatible PBX | SIP trunking needs a PBX or platform that can use it | Confirm PBX compatibility first |
| Replacing a PBX that still fits | Some businesses can keep a Yeastar, 3CX or compatible system | Review the current PBX before replacing it |
| Choosing Cloud PBX when onsite control is required | Some customers need local PBX features or integrations | Scope business and technical requirements first |
| Ignoring internet and LAN readiness | Good voice still needs stable upload, low jitter and good routing | Check network readiness before cut-over |
| Forgetting number porting | Existing numbers must be planned correctly | Include porting in the migration plan |
| Assuming Teams voice is automatic | Teams voice integration has its own requirements | Scope Teams workflows separately |
| Comparing only monthly price | Hardware, support, calls, features and reliability matter | Compare total fit, not one line item |
FAQs
VoIP vs Cloud PBX vs SIP trunking FAQs
What is the difference between VoIP and Cloud PBX?
VoIP is the internet-based calling service. Cloud PBX is the hosted business phone system that manages extensions, call routing, voicemail, queues, recordings and other phone features. A business may use VoIP through a Cloud PBX, but the two terms do not mean the same thing.
What is the difference between SIP and VoIP?
SIP is a signalling protocol used to set up, manage and end many modern VoIP calls. VoIP is the broader method of carrying voice over an IP network. In plain English, SIP is part of how many VoIP calls are controlled, while VoIP is the overall calling method.
What is SIP trunking?
SIP trunking is a voice service that connects a compatible PBX, such as Yeastar, 3CX or another supported platform, to a voice provider. It is usually a good fit when the business wants to keep an existing PBX but needs modern voice trunks, channels and call routing.
Should my business choose Cloud PBX or SIP trunking?
Choose Cloud PBX if you want a complete hosted phone system with extensions and managed features. Choose SIP trunking if you already have a compatible PBX that you want to keep. SureTel can help compare both options against your users, devices, call flow, budget and support needs.
Can SureTel provide VoIP, Cloud PBX and SIP trunking?
Yes. SureTel can provide business VoIP, Cloud PBX and SIP Trunking. The right option depends on whether the business needs a complete hosted phone system, wants to keep an existing PBX, needs Teams integration, or wants a mixed setup across branches or teams.
Is SIP trunking only for call centres?
No. SIP trunking can be used by any business with a compatible PBX, not only call centres. It is common where a company has an onsite or private PBX and needs voice channels, number porting, outbound routing or inbound call handling through a provider.
Can I use Teams with VoIP or Cloud PBX?
Teams can be part of a voice setup where the requirement is scoped properly. Some businesses want calling aligned to Microsoft Teams workflows, while others are better served with desk phones, softphones, DECT or Cloud PBX features. Compatibility, licensing and routing should be checked before implementation.
Are VoIP, Cloud PBX and SIP trunking mutually exclusive?
No. These options often work together. A business may use Cloud PBX and VoIP, or an onsite PBX with SIP trunking and VoIP. The correct combination depends on the phone system, devices, number requirements, connectivity, user roles and support expectations.
Does the internet connection matter for all three options?
Yes. Cloud PBX, VoIP and SIP trunking all depend on reliable connectivity, stable upload, low latency, low jitter, low packet loss and correct router/firewall setup. A fast connection can still create poor calls if the local network, Wi-Fi, QoS or backup planning is weak.
Related guides: what VoIP means, what Cloud PBX means, VoIP equipment guide, how to set up VoIP and VoIP security & fraud prevention. See our SIP trunking explainer for a plain-English overview.
Next step
Not sure which voice option fits your business?
Tell SureTel about your users, phones, PBX, numbers and branches, and we’ll help compare the practical options.
Comparison guide · Not a quote · This page compares VoIP, Cloud PBX and SIP trunking so buyers can request the right option. For pricing, see the linked service and pricing pages.