Is a hosted PBX the same as a virtual PBX?

Yes. Hosted PBX, virtual PBX, and cloud PBX are three names for the same thing: a business phone system that runs on a provider's servers instead of a box in your office. Different companies pick different names for marketing. When you compare quotes, look at the features and the price per user, not the label on the brochure.

What happens to a hosted PBX when the internet goes out?

Desk phones and computer softphones stop working, because they reach the provider over your internet connection. Your phone number still works, though, because it lives at the provider, not in your office. Most providers let you set a failover rule that forwards calls to a cell phone when the office drops offline. Set it up before you need it.

Do I need to change my phone number to switch to a hosted PBX?

No. You can port your existing number to the new provider, and customers never notice a change. Porting takes some days to finish, and your old service keeps working until it does. Ask the new provider to handle the paperwork. Keep the old account open until the port is confirmed, or the number can be lost in the handoff.

Glossary

Phone Systems

What Is a Hosted PBX?

By Bryan Smith, CEOUpdated August 20, 2026

A hosted PBX is a business phone system that runs on a provider's servers in the cloud instead of on equipment in your office. You get the same features as a traditional PBX, like extensions and transfers, for a monthly fee. The provider handles the hardware and updates. It is also called a virtual PBX or cloud PBX.

Key Takeaways

A hosted PBX gives you extensions, menus, and transfers with no equipment in your office.
"Hosted PBX," "virtual PBX," and "cloud PBX" all mean the same thing.
Most plans charge per user per month, and the provider handles updates and repairs.
If your internet goes down, so do your desk phones, unless you set a failover rule to a cell number.

How a Hosted PBX Works

A traditional PBX is a cabinet in a closet. A hosted PBX takes that cabinet out of your building and puts it in the provider's data center. Your phones talk to it over the internet.

You sign up and pick a plan, usually priced per user per month.
You port your business number to the provider, or get a new one.
Each person gets a phone extension. They can use a desk phone that plugs into the internet, a softphone app on a computer, or an app on their cell.
You set up the call flow in a web dashboard: the greeting, the auto attendant menu, business hours, and where calls go when nobody picks up.
A caller dials your number. The call hits the provider's servers, follows your rules, and rings the right phone wherever it is.

Because the "box" is in the cloud, the features travel with your people. A tech in a truck can have an extension on his cell. The office can move buildings without touching the phone system. Updates happen on the provider's side while you sleep.

Example of a Hosted PBX

An HVAC company with an office manager and three techs moves from an aging office PBX to a hosted one. They port the main number, set up four extensions, and record a short menu: press 1 for service, press 2 for billing. Service rings the office manager at 101 for four rings, then a ring group of all three techs' cell apps. After hours, calls go to the on-call tech.

The move pays off right away. No more service contract on the old cabinet. The owner changes the after-hours rule from her phone while standing at a job site. When a tech leaves, she deletes his extension in a minute.

Then it is 10 am on the first hot day of June. The office manager is on the phone with a supplier. All three techs are on ladders. A homeowner calls about a dead AC unit, a $400 repair. The call rings the office, then rings three cell phones in three pockets, then goes to voicemail. The hosted PBX did its job. The job still needed a person.

What People Get Wrong About a Hosted PBX

Owners expect "hosted" to mean "handled." It means the hardware is handled. The calls still ring to the same people, in the same attics.

The more specific mistake is buying a seat for everyone. Hosted PBX pricing is usually per user. A five-person company buys five seats. But in a service business, only one or two people ever sit at a desk. The techs answer their own cell phones, and their "extension" is really just a forward to a number they already had. The owner ends up paying every month for seats that do nothing a free forwarding rule could not do.

The fix is to license the desks, not the headcount. Give the office a real extension. Route calls to the crew by forwarding to their cells. Then spend what you saved on the one thing no phone system includes: something that always answers when the office is busy and the crew is on ladders.

Hosted PBX vs. On-Site PBX vs. SIP Trunking

A hosted PBX is the whole phone system, rented and run by a provider in the cloud. Nothing to own.
An on-site PBX is the same system as hardware you buy, install, and maintain at the office.
SIP trunking is not a phone system at all. It is the internet connection between a PBX you already own and the public phone network. Companies with a working on-site PBX use it to drop their copper lines without replacing the system.

If you have no PBX and want one, hosted is the simple path. If you have one that works, SIP trunking is often the cheaper upgrade.

Why It Matters

For a small business, a hosted PBX removes a closet full of risk: no hardware to fail, no technician to call, no service contract to renew. The monthly fee buys flexibility. But it does not buy answered calls. A dashboard full of routing rules still ends at a human who may be busy. Many owners add an AI receptionist as the final stop in the flow, so a call that rings through the office and the crew is still picked up, the caller's question answered, and the job booked. For a step-by-step look at setting up a cloud system, see virtual phone system setup for small business.

The Bottom Line

A hosted PBX is a business phone system run by a provider in the cloud, with extensions, menus, and transfers and nothing to maintain. It is the same thing as a virtual PBX or cloud PBX. Pay for the desks that need seats, forward to the crew, and make the last stop in every call flow something that always answers.

Frequently Asked Questions

Is a hosted PBX the same as a virtual PBX?: Yes. Hosted PBX, virtual PBX, and cloud PBX are three names for the same thing: a business phone system that runs on a provider's servers instead of a box in your office. Different companies pick different names for marketing. When you compare quotes, look at the features and the price per user, not the label on the brochure.
What happens to a hosted PBX when the internet goes out?: Desk phones and computer softphones stop working, because they reach the provider over your internet connection. Your phone number still works, though, because it lives at the provider, not in your office. Most providers let you set a failover rule that forwards calls to a cell phone when the office drops offline. Set it up before you need it.
Do I need to change my phone number to switch to a hosted PBX?: No. You can port your existing number to the new provider, and customers never notice a change. Porting takes some days to finish, and your old service keeps working until it does. Ask the new provider to handle the paperwork. Keep the old account open until the port is confirmed, or the number can be lost in the handoff.

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