What is a mini-PBX and does a small office need one? Extensions, voice menus and the call flow
Sado AI team · · 4 min read
In short
A mini-PBX is an office’s small telephone exchange. It shares calls to the city number out to extensions: sales, accounts, the manager. Staff call each other on short numbers, transfer a customer to a colleague, and at night the PBX sends calls to whoever is on duty or elsewhere. With one or two people on the phone you often don’t need one; once you have departments, it helps. Before buying, draw the call flow on paper: who answers first, what happens with no answer, where calls go at night.
What a mini-PBX does
| Feature | What it gives you |
|---|---|
| Extensions | Each employee gets a short number: 101, 102, 103 |
| Call transfer | The customer reaches the right person without dialling again |
| Voice menu | “Sales, press 1; delivery, press 2” |
| Ring group | Several phones ring at once; whoever is free answers |
| Working-hours rule | At night and at weekends calls go somewhere else |
| Recording | Call recordings are kept on the PBX |
Do you need a mini-PBX?
- Several people answer calls and keep passing customers to each other: yes.
- You have separate departments such as sales, service and accounts: yes.
- You want evening calls sent elsewhere and calls recorded: useful.
- One person answers everything: usually not; a mobile and call forwarding will do.
- If the main problem is missed calls, a PBX won’t solve it alone: someone still has to answer.
A box in the office or a cloud PBX
A classic mini-PBX is a box in the office. You buy it once, a specialist sets it up and phones connect to it by cable. If the office loses power or internet, it may stop too.
A cloud PBX does the same job on the provider’s server: no box in the office, staff work from anywhere on an IP phone or an app, and you pay monthly per user. For many small companies that is the simpler route today.
How to draw the call flow
- Write down which numbers receive calls and what each one is for.
- Who answers first during working hours: one person or a group.
- What happens with no answer: for example, after 20 seconds the next person’s phone rings.
- What happens when everyone is busy: waiting, a voice message or forwarding.
- Where calls go after hours and at weekends.
- If you need a voice menu, keep it to 3–4 options and put the most common one first.
With this drawing, both the specialist who sets up the PBX and your provider know exactly what to do.
How an AI operator works with a PBX
There are two usual set-ups. In the first, the AI operator answers first, handles simple questions itself and, when needed, transfers the call to the right person by your rule. In the second, the PBX gives calls to staff during working hours and sends them to the operator at night and at weekends. Either way, we agree together which calls go to the operator, and work out the route with your provider and your PBX.
Sado: Assalomu alaykum, Chinor Mebel, this is Malika.
Caller: Hello. I’d like to order a made-to-measure kitchen.
Sado: Of course. Roughly how long is the kitchen, and is it straight or L-shaped?
Caller: About three metres, L-shaped.
Sado: Got it. Made-to-measure orders are handled by our designer Jasur. I’ll put you through now, one moment.
Caller: Fine, thank you.
Instead of pressing menu buttons, the caller says what they need and the operator sends them to the right person. More: AI operator for incoming calls, connecting the operator to your number, questions about Sado. Try it live.
Questions
Does a mini-PBX work without the internet?
An old PBX on ordinary lines works without it. An IP PBX or cloud PBX needs the internet, so set up a rule in advance that sends calls to a mobile if the connection drops.
Is it hard to add an AI operator if we have a PBX?
No, you just agree the route first: which calls go to the operator and whom it transfers to. Sado’s team works this out with you, your provider and your PBX.
Should we have a voice menu?
With many departments, a short menu helps. But many people would rather say what they need than press buttons, and a live answer, from staff or an AI operator, often settles it faster.