What is a PBX: extensions, ring groups and how it works together with an AI voice operator
Sado AI team · · 4 min read
In short
A PBX (private branch exchange) is a company’s internal phone exchange. It takes calls to the outside number, hands them to staff extensions and connects staff with each other. It can be a box in the office or a virtual PBX on the provider’s server. A PBX decides who gets the call, but it doesn’t talk: when everyone is busy or it’s night, the call goes unanswered. An AI operator works alongside the PBX: it answers itself and transfers to staff when needed.
What a PBX does
- Gives extensions: reception 101, warehouse 102, director 103. Staff call each other on a three-digit number.
- Rings a group: several phones at once or one after another.
- Plays a voice menu: “For sales, press 1” (what is IVR).
- Forwards: after hours it sends the call to the duty person’s mobile.
- Records calls and reports: how many calls came in and how many were missed.
Types of PBX
| Type | Where it runs | Who it suits |
|---|---|---|
| Office PBX | A box in the office, wired phones | Companies with many desk phones in one building |
| IP PBX | On your own server, with SIP phones | Companies with their own IT person |
| Virtual (cloud) PBX | On the provider’s server, set up in a browser | Small and mid-sized businesses, several branches |
Many companies now pick a virtual PBX: no hardware to buy, and staff get calls on their extension in the office or at home. The outside number usually reaches the PBX over SIP (what is SIP).
Example: a car service in Yunusabad
Tez Usta car service (name invented) has one city number and a virtual PBX. A call travels like this:
- The customer calls and the PBX plays a short greeting.
- The “Reception” group rings: the admin’s extensions 101 and 102, for 20 seconds.
- If nobody picks up, the call goes to the workshop on 103.
- If there’s no answer there either, the caller hears “the line is busy” or the call drops.
On Saturday the admin is at the till and the mechanics are under cars. The report shows dozens of missed calls, but nobody knows which were oil changes and which were big repairs. Each missed call may be a customer gone to another garage (missed calls).
How an AI operator works with a PBX
There are two set-ups. In the first, the AI operator answers first, handles simple questions itself and transfers to the right person by your rule. In the second, the PBX gives calls to staff during the day and sends them to the operator when nobody picks up or at night. We agree with you which calls go where and set up the route with your provider and your PBX. On Saturday a call to Tez Usta sounds like this:
Sado: Assalomu alaykum, Tez Usta car service, this is Shohruh.
Caller: Hello. I’d like an oil change, is today possible?
Sado: Today is full, but tomorrow we have ten or twelve o’clock. Which suits you?
Caller: Ten. Also, a door is slightly dented. Can the body shop take a look?
Sado: Oil change booked for ten tomorrow. Bodywork is assessed by our mechanic Bobur, I’ll put you through to him now.
Caller: Fine, thanks.
No keys to press and no busy tone: the operator made the simple booking itself, and the mechanic got only the call about his work. Each call’s recording and transcript stay in the portal.
What to check in your PBX settings
- Who is in which group and after how many seconds the call moves to the next number.
- Where calls go after hours and on public holidays.
- What the caller hears when everyone is busy: a queue, a busy tone or an operator who answers.
- Who calls back missed calls, and how soon.
- Whether calls are recorded and the result reaches your CRM.
With Sado you pay only for talked minutes: 800 so‘m a minute, no monthly fee and no setup fee. Try it live or call 78 778 01 23. Connection questions: questions about Sado.
Questions
What is the difference between an office PBX and a virtual PBX?
An office PBX is a device in your office; a virtual PBX runs on the provider’s server and is set up in a browser. Both do the same job: hand calls to extensions.
Do I need to replace my PBX to use an AI operator?
No. Sado connects to your current number over SIP and your PBX stays. We agree together which calls go to the operator and which to staff.
Does a small business need a PBX?
With one or two staff, often not. What matters more is who answers: staff during the day, an AI operator at night and when everyone is busy.