Hosted PBX: What It Is, How It Works and What It Costs in 2026

A hosted PBX is a business phone system where the PBX, the software that runs extensions, call routing, voicemail and the auto attendant, lives in a provider's data centers instead of in a closet at your office. Your desk phones, computers and mobile apps connect to it over the internet, and you pay a monthly fee per user instead of buying and maintaining the hardware.

For most small and midsize businesses, that trade is the reason to switch: no on-site box to repair, features that update on their own, and a phone system that works the same from the office, home or a second location. This guide explains what a hosted PBX is, how it works, which hosted PBX features matter, what it really costs, how it compares with an on-premise PBX and what to check before you move.

What Is a Hosted PBX?

PBX stands for private branch exchange: the system that gives a business its own internal phone network, with extensions, transfers, hold, ring groups and a main number that reaches everyone. For decades it was a physical cabinet wired to every desk and to phone lines from the local carrier.

What is a hosted PBX, then? It is the same set of functions delivered as a service. The provider runs the PBX software on its own servers, connects it to the public phone network and gives you a web portal to manage users and call flows. You will also see it called a cloud PBX, a virtual PBX or simply a cloud phone system. In practice the labels describe the same model.

How Does a Hosted PBX Work?

Every phone on the system, whether a desk phone, a softphone on a laptop or an app on a cell phone, registers with the provider's platform over the internet using SIP, the standard signaling protocol for voice over IP. When a call comes in to your main number, the platform decides where it goes based on the rules you set.

• A customer dials your business number, which the provider owns or has ported in for you
• The platform answers and applies your call flow: business hours, holidays, auto attendant menu, queue or ring group
• It rings the right extensions, wherever those phones or apps are connected
• If nobody answers, it sends the caller to voicemail and emails or transcribes the message
• Outbound calls leave the same way, showing your business caller ID from any device

Because the logic sits in the provider's network rather than your building, the system keeps working when your office does not. If your internet goes down, calls can still be routed to mobile apps or another location. On Dial Raven's cloud phone system, routing rules, IVR menus and ring groups are all set from a dashboard, without a technician on site.

Hosted PBX Features Small Businesses Actually Use

Feature lists run to dozens of items, but a handful do most of the work in a small business. These are the hosted PBX features worth confirming on any plan you compare.

• Auto attendant and multi-level IVR menus that greet callers and route them by department
• Ring groups and call queues so calls reach the next free person instead of voicemail
• Business hours, holiday and after-hours routing that switches automatically
• Mobile and desktop apps that carry your business number and extension
• Voicemail-to-email and transcription so messages are not trapped on one handset
• Call recording, call reports and analytics for training and staffing decisions
• Business texting from the same number customers already call
• E911 location settings for every phone and remote worker

Check which plan tier includes each feature, not just whether the provider offers it. Auto attendant and call recording are often reserved for a higher tier. On Dial Raven, for example, Starter covers calling, texting and the app, while Pro adds the auto attendant, call recording and analytics.

Hosted PBX vs On-Premise PBX: What Is the Difference?

The hosted PBX vs on-premise PBX decision comes down to who owns, runs and pays for the system. With an on-premise PBX, you buy the hardware, house it, connect it to phone lines or SIP trunks and pay someone to maintain it. With a hosted system, the provider does all of that and you pay per user.

Factor	Hosted PBX	On-Premise PBX
Upfront cost	Little or none; phones optional	PBX hardware, licenses, installation
Monthly cost	Per-user subscription	Phone lines or trunks plus maintenance
Who maintains it	Provider handles servers, updates, security patches	Your IT staff or a contracted vendor
Adding users	Add in the portal in minutes	May need licenses, ports or cards
Remote and mobile work	Built in through apps	Needs extra licenses, VPN or add-ons
Multiple locations	One system across every office	A box per site or linked systems
Office internet outage	Calls reroute to apps, cells or other sites	Outside lines may still work; remote users cannot
Control and customization	Configured within the provider's platform	Full control, including custom integrations
End of life	Provider upgrades continuously	Hardware ages and eventually needs replacing

On-premise still makes sense in a few cases: a large site that already owns a recently upgraded PBX, a facility with strict rules on where call data can live, or a building with poor internet and no realistic backup. For most offices of 2 to 200 people, a hosted system removes cost and work without giving up features.

How Much Does a Hosted PBX Cost?

Hosted PBX cost is mostly one number: a monthly fee per user. The rest is optional or one-time. When you compare quotes, line up every item below, because a low headline price can hide setup charges, porting fees or a feature you will need on a higher plan.

Cost Item	Type	What to Ask
Per-user subscription	Monthly	Which features each tier includes, and whether calling is unlimited
Setup and onboarding	One-time	Is there a setup fee, and who builds the call flows?
Number porting	One-time	Is porting free for every number, including toll-free?
Desk and conference phones	One-time, optional	Can staff use apps instead? Do phones ship pre-configured?
Add-ons	Monthly	Call recording storage, call center features, bulk texting
Contract terms	Ongoing	Monthly or annual, and is there an early-termination fee?

Here is how that looks for a 10-person office on Dial Raven. On Pro at $24.99 per user, the subscription is about $250 a month and includes the auto attendant, call recording and analytics. A team that only needs calling, texting and the app could start on Starter at $14.99 per user, or about $150 a month. Onboarding and number porting are free, there are no long-term contracts, and desk phones are only needed for staff who want them. See every tier on our business phone plans page.

The comparison that matters is total cost, not the subscription alone. Against an on-premise PBX, add up the phone lines or trunks, the maintenance contract, the cost of the next hardware replacement and the hours someone spends on moves, adds and changes. That is what the subscription replaces.

Hosted PBX Pros and Cons

Hosting is the right fit for most small businesses, but not without trade-offs. Weigh both sides against how your team works.

Advantages

• No PBX hardware to buy, house, repair or replace
• Predictable monthly cost that scales with headcount
• The same system for office, remote and mobile staff
• New features and security updates arrive without a site visit
• Multiple locations share one directory, one menu and one bill

Limitations

• Call quality depends on your internet connection and network setup
• Desk phones need power, so an outage requires battery backup or apps on cell phones
• Custom integrations are limited to what the provider's platform supports
• Moving providers later means porting numbers again

Most of the limitations are manageable with planning. A second internet connection or cellular failover, a small battery backup for the network switch and the mobile app on every phone cover the majority of outage scenarios we see.

What Do You Need Before Switching to a Hosted PBX?

Moving to the cloud takes less equipment than most people expect, but four things deserve attention before the first call. Our PBX to VoIP migration guide covers the full project plan.

A Network That Handles Voice

Voice is less about raw speed than about consistency. The ITU's G.114 recommendation on one-way transmission time treats one-way delay below about 150 milliseconds as unnoticeable for most conversations, and advises keeping it under 400 milliseconds for network planning. Run a test from the office during a busy hour, prioritize voice traffic on your router and turn off SIP ALG if your provider recommends it.

Phones, Apps or Both

Decide who needs a desk phone and who will use the app. Receptionists and front-desk staff usually want a physical phone with busy lamp keys, while managers and field staff often prefer the mobile app. Many SIP phones you already own can be re-provisioned; proprietary handsets from an old on-site system usually cannot.

911 Location for Every Phone

A cloud phone system is still a multi-line telephone system, so federal 911 rules apply. Under the FCC's rules for Kari's Law and RAY BAUM'S Act, users must be able to dial 911 without a prefix such as 9, the system must alert a central point such as the front desk, and calls must carry a dispatchable location, meaning a street address plus details like the floor or suite. Set this for every desk phone and remote worker before you go live. Our E911 compliance guide walks through the setup.

Your Numbers, Ported Correctly

You can keep your main number and direct lines. The FCC's number portability rules apply across wireline, IP and wireless providers, require simple ports to be processed in one business day and stop your old carrier from refusing a port because you owe money. Multi-line business ports take longer, so have a recent bill, the account number, the authorized name and the service address ready, and keep the old account open until the port completes.

Should You Keep Your PBX and Use SIP Trunking Instead?

If you bought or upgraded an on-site PBX in the last few years and it still does what you need, you do not have to replace it to get off copper lines. SIP trunking connects your existing PBX to a cloud carrier, so you keep the hardware and the handsets while cutting line costs.

The difference is who runs the PBX. With SIP trunking, you still own and maintain the system; with hosted, the provider does. Businesses with an aging PBX, multiple sites or a growing remote team usually come out ahead with hosted. Those with a newer system and in-house IT often start with trunks and move to hosted when the hardware reaches end of life.

How to Choose a Hosted PBX Provider

Most providers look similar on a pricing page. These questions separate them once you are talking to sales.

Question	Why It Matters
Which features are in each plan tier?	Auto attendant and recording are often locked to higher tiers
Is there a written uptime SLA?	It shows how the provider stands behind reliability
Who builds the call flows and ports the numbers?	Free, hands-on onboarding prevents a messy first week
How is 911 location handled for remote users?	Federal rules require a dispatchable location
Can I use my existing SIP phones?	Avoids buying hardware you do not need
Is support in-house and reachable by phone?	Phone outages need a person, not a ticket queue
Are there contracts or termination fees?	Month-to-month plans keep the provider accountable

Ask for a short call-flow review before you sign. A good provider will map your current menu, ring groups and after-hours handling into the new system and point out what can be simplified.

Frequently Asked Questions

A hosted PBX gives a small business everything an on-site phone system did, extensions, menus, queues and voicemail, without the hardware, maintenance or end-of-life replacement, for a predictable monthly fee per user. Get the network, phones, 911 locations and porting right, and the switch is usually invisible to callers. When you are ready, get started with Dial Raven: we port your numbers, build your call flows and have your team live in under 24 hours, with free onboarding and no long-term contract.