A hosted PBX is a business phone system whose switchboard runs on a provider's servers instead of a box in your building. You keep the numbers, the extensions, the menus, and the call routing, but the equipment, the maintenance, and the upgrades become somebody else's job. In practice, "hosted PBX" and "cloud phone system" now describe the same thing.
The term still shows up on procurement forms and vendor sites, which sends people looking for the difference between three words that mostly overlap. Let us separate them properly, because the distinction matters exactly once: when you are deciding whether to keep owning hardware.
What PBX means, and why it was ever in your closet
PBX stands for Private Branch Exchange. It is the switchboard that sits between the outside phone network and the phones inside one business, and its whole job is to let a company publish one number while a dozen people answer it, transfer calls to each other, and dial internally without going through the public network.
For most of the twentieth century that switchboard was a physical thing. You bought it, a technician installed it, it lived in a closet or a rack, and when you wanted to add a person you bought a handset and sometimes ran new cable. It worked well and it cost a fortune, and every feature you now take for granted, an auto attendant, a ring group, call recording, arrived as a hardware upgrade cycle.
Hosted PBX is the same switchboard, moved. The logic that answers, routes, and connects your calls runs in a data center, and your phones (or apps) reach it over the internet. That is the entire idea.
Hosted PBX vs cloud phone system vs VoIP
Three terms, one modern setup, described from different angles.
| Term | What it actually refers to | Use it when |
|---|---|---|
| VoIP | The transport. Calls travel over the internet as data rather than over a copper circuit. | You are talking about how the call gets there |
| Hosted PBX | The switchboard, run on a provider's servers instead of your premises. The legacy industry term. | You are replacing an actual PBX box, or filling in a procurement form |
| Cloud phone system | The whole product: numbers, menus, routing, voicemail, texting, analytics, and the apps. | You are describing what a modern team actually buys |
So: every hosted PBX uses VoIP, and a cloud phone system is a hosted PBX with a modern product wrapped around it, mobile apps, business texting, self-serve setup, and a settings page instead of a vendor ticket. If a salesperson tells you these are three different purchases, they are selling you something.
One genuine distinction survives. Traditional hosted PBX often still assumes desk phones and extensions, and is sold to people replacing equipment. Cloud systems assume the phone in your pocket is the handset. That is a difference in worldview more than in technology, but it shows up in the price and in how long setup takes.
If you are still working out which category you are shopping in, the full taxonomy, including the key systems and on-premises boxes that predate all of this, is laid out in types of business phone systems. Once the category is settled, the business phone system comparison puts current entry pricing for each provider side by side.
Hosted PBX vs on-premise PBX: the actual comparison
| Hosted PBX (cloud) | On-premise PBX | |
|---|---|---|
| Upfront cost | None. Pay per user, monthly or yearly | Hardware purchase plus installation labor |
| Ongoing cost | $15 to $59 per user per month | Maintenance, line rental, eventual replacement |
| Who maintains it | The provider. Updates happen without you | You, or a vendor you keep on contract |
| Time to a working line | About five minutes, self-serve | Days to weeks, with a scheduled install |
| Adding a person | A click in the browser | A handset, a port, sometimes new wiring |
| Remote and hybrid teams | Native. The system does not know where anyone sits | Needs VPN or extra gear per remote worker |
| Power outage | Calls stop unless you forward to a cell | Often keeps working. Its strongest remaining argument |
| Customization | Deep, within what the platform offers | Total, if you employ someone who can do it |
The honest summary: on-premise still makes sense for organizations with heavy custom telephony integration, strict on-site requirements, or a genuine need to answer calls during a blackout. For a team under fifty people, it almost never does, and the market reflects that. The FCC's count of every voice line in the country found that of 53 million US business wireline connections in June 2025, 83.7 percent were VoIP, with traditional switched lines vanishing at a compound 17.9 percent a year (FCC, Voice Telephone Services, May 2026).
What you keep when you move off the box
People assume a migration means losing things. It usually means the opposite, but the two that genuinely matter are worth stating plainly.
Your number. US phone numbers are portable by law, including toll-free numbers, so the line printed on your van and your invoices comes with you. Porting into Phoner is free, takes one to two weeks, and the old system keeps ringing the entire time, so there is no window where customers reach nothing.
Your extensions and menu structure. Whatever your PBX does today, press 1 for sales, ring the warehouse after 6pm, send the overflow to a mailbox, is a routing rule you rebuild in a browser in an afternoon. Most teams take the migration as a chance to delete the three branches nobody has used since 2019.
What you give up is the equipment, the maintenance contract, and the ticket you have to open to change a greeting before a holiday. On a hosted system, whoever notices at 11pm can just change it.
What it costs
Hosted PBX pricing looks like software pricing, because it is: $15 to $40 per user per month across the US market, with unlimited domestic calling usually included. Phoner is $15 per user on Starter, $29 on Team (which adds the auto attendant, ring groups, texting, and call recording), and $59 on Business for multi-level menus and CRM integration. Extra numbers are $5 a month each.
Set that against an on-premise system, where the hardware is a capital purchase, each line rents for roughly $40 to $70 a month, and a technician visit has a price. The crossover is not close for a small team. We broke the whole invoice down in how much a business phone system costs, including the four line items that catch people out. Entry pricing across the main hosted PBX providers is tabulated yearly against monthly, alongside which ones support the SIP desk phones you may already own.
Before you migrate: the one thing to check
Your internet connection. Voice needs very little bandwidth, roughly 100 kbps up and down per simultaneous call, so a five-person team on calls at once needs about half a megabit. That is nothing. What voice does need is stability, because jitter on a flaky wifi access point is what makes people say VoIP sounds bad, when the real problem is the network.
Wire the desks that can be wired, use a decent access point for the ones that cannot, and the audio complaints stop. Since your phone system now depends on that connection the way your email already does, plenty of teams also keep a monitor on whether the connection is actually up, which is how you find out about an outage before a customer tells you.
Frequently asked questions
What is a hosted PBX?
A hosted PBX is a private branch exchange, the switchboard that routes a business's calls, operated on a provider's servers and delivered over the internet instead of running on hardware in your building. You configure the numbers, extensions, menus, and routing in a browser, and the provider owns and maintains the equipment.
How does a hosted PBX differ from cloud VoIP?
Very little in practice. VoIP is the technology that carries the call over the internet, hosted PBX is the switchboard running on someone else's servers, and a cloud phone system is the full product built on both. Vendors use the terms interchangeably, and for a small business they describe the same purchase.
Is hosted PBX cheaper than on-premise?
For most small and mid-sized teams, clearly yes. There is no hardware to buy, no installation, and no maintenance contract, and you pay $15 to $40 per user per month instead of renting lines at $40 to $70 each. On-premise can still win at large scale or where heavy custom integration is required.
Do I need special phones for a hosted PBX?
No. The apps on iOS, Android, desktop, and the browser act as the handsets, and most teams never buy a phone. Standard SIP desk handsets still work if your people want a physical phone on the desk, but they are optional, and skipping them removes the only real upfront cost.
Can I keep my phone numbers when moving to a hosted PBX?
Yes. Number portability is a legal right in the US, so your existing business and toll-free numbers move with you. Phoner ports them in for free, the process takes one to two weeks, and your current line keeps working right up until the port completes, so no calls are lost.
Where to start
If you are replacing a PBX, the migration is smaller than it looks: pick or port the number, rebuild the menu, and hand the team an app. Start with the VoIP phone service that carries the calls, or read how to port a business phone number if keeping your line is the part you are worried about. It is the part people worry about most, and it is the part we handle for you.
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