7 questions every SME should ask before choosing a PBX
Price, minutes and handsets are the easy questions. These seven are the ones that decide whether your phone system still works for you in a year.
What should I ask a PBX provider before signing up?
Go beyond price. Ask where the platform is hosted and what redundancy it has, what happens during a power or network outage, what the support SLA actually guarantees, what security is built in, how easily it scales, what AI features it offers, and what the total cost is once setup, porting, hardware and add-ons are included. Then pilot it for 30 days.
Why these seven questions matter more than price
Most SMEs shopping for a phone system ask about monthly cost, included minutes and handsets. Useful, but those are not the questions that decide whether the system still serves you in twelve months.
The questions below are the ones providers do not always volunteer. They separate a phone system that quietly works from one that becomes an expensive headache the first time you grow, get attacked, or lose a connection. Ask all seven before you sign anything, and weigh the answers against each other rather than chasing the lowest sticker price.
Reliability: where it lives and what breaks
A cloud PBX is only as dependable as the platform underneath it and the contract that backs it.
1. Where is the PBX hosted, and what redundancy is built in?
This is the question almost nobody asks, yet it has the biggest effect on day-to-day reliability. If a provider runs their platform from a single server in one data centre, one hardware fault or network outage takes every customer’s phones offline at once.
2. What happens during a power or network outage?
National load shedding eased through early 2026, but localised outages, cable theft and fibre faults have not gone away. You need to know the system keeps working when your office, or the provider’s, loses power. Because the PBX itself sits in a data centre with backup power, a good provider can reroute your numbers to mobile apps or alternate destinations automatically while your office is dark. Your job is to protect the last few metres: a UPS on the router, switch and any desk phones, plus the mobile app installed as a failover.
3. What does your support SLA actually guarantee?
“We have great support” is not an SLA. Ask for the uptime percentage in writing (aim for 99.9% or better), the guaranteed response time for a phones-down emergency, the support hours and channels, and whether there is any credit if they miss it. A provider confident in their platform will commit to numbers; one that dodges the question is telling you something.
Security and room to grow
A phone system is a target and a moving part. Check both before you commit.
4. What security protections are built in?
VoIP fraud is real money: criminals hijack accounts to dial premium-rate numbers, often overnight and over weekends. Ask what is in place by default, not as an add-on: encryption of calls and signalling, international-dialling controls and spend caps, fraud monitoring with alerts, and strong authentication on the admin portal. Confirm the provider is ICASA-licensed (an Electronic Communications Service licence for a reseller, ECS plus ECNS for a network operator), and that they handle your call data in line with POPIA.
5. How easily does this PBX scale as we grow?
The right system makes adding or removing users a self-service change, not a sales call and a new contract. Ask how you add a user and how quickly, whether you can scale down as well as up, what happens to per-user pricing at higher volumes, and whether new sites or remote staff just plug into the same platform. A cloud PBX should grow by a few clicks; if growth means a project, that is friction you will feel every year.
Capabilities and the real cost
The last two questions are where buyers either future-proof the decision or get surprised by the bill.
6. What AI capabilities does the platform offer?
AI features are moving from novelty to standard in cloud PBX: live transcription and call summaries, AI-assisted routing and auto-attendants, voicemail-to-text, and sentiment or keyword flagging for quality. You do not need every feature on day one, but ask what is available, what it costs, and whether it is built in or bolted on. The honest test is whether a feature saves your team time on a real task, not whether the demo looks impressive.
7. What is the total cost, including the hidden parts?
The advertised per-user price is rarely the whole story. Ask about everything around it before you compare quotes.
| Cost to check | Why it bites |
|---|---|
| Once-off setup or onboarding | Can dwarf the first month’s subscription |
| Handsets or hardware | Buy outright vs rent changes the maths quickly |
| Number porting fees | Sometimes charged per number to bring yours across |
| Call rates and bundles | A cheap seat with expensive minutes is not cheap |
| Contract term and early-exit | A long lock-in with penalties limits your options |
| Add-ons treated as standard | Recording, AI, extra storage billed on top |
Almost nobody asks where the system is hosted, yet it is the single answer that predicts how often your phones will go quiet.
WhichVoIP editorial view
Common mistakes SMEs make choosing a phone system
The wrong PBX is usually picked for the right-sounding reason.
A checklist before you sign
Our verdict
A phone system is bought once and lived with for years. The providers worth shortlisting answer all seven questions plainly and put the important ones in writing. The ones that deflect on hosting, SLA or total cost are showing you how the relationship will go. Price is the tie-breaker, not the test.
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Frequently asked questions
How many questions should I ask a PBX provider before signing?
Do I really need AI features in my phone system?
How much should a cloud PBX cost for an SME in South Africa?
What is the biggest risk with choosing the wrong PBX?
How do I check a PBX provider is properly licensed?
Should I sign a long contract to get a lower price?
Keep reading
Sources: ITU-T uptime and SLA conventions; ICASA licensing framework (ECS / ECNS); POPIA; WhichVoIP South African market pricing observations. Verified 18 June 2026.