Most businesses shopping for a cloud phone system are solving one of two different problems without separating them: getting calls to the right person, or stopping calls going unanswered in the first place. The first is what a phone system does. The second increasingly is not — and it is worth knowing which you are buying before you compare price per seat.
Every competitor description below is drawn from that vendor's own public positioning as of the date at the foot of this page. Products in this category change often; check the vendor before deciding.
What a cloud phone system actually is
A phone system that runs over the internet instead of hardware in your building. Numbers, extensions, voicemail, hunt groups and routing all live in software, so staff can take a work call from a laptop in one city and a mobile in another.
That is genuinely useful, and it is also where most of the category stops. A cloud phone system is very good at moving a call to a human. It does not remove the need for one to be free.
How we compared them
- Where calls land — routing, hunt groups, and what happens when nobody picks up.
- Remote and mobile — whether the mobile and desktop apps are first-class or an afterthought.
- What connects — CRM, calendar and helpdesk, without a project to wire it.
- Contact centre depth — queues, supervisors and reporting, if you need them.
- Real cost at your headcount — not the advertised entry tier.
The shortlist
#1
RingCentral
The broadest platform
RingCentral positions itself around business voice with a layer of AI on top, marketing an AI Receptionist and AI assistant alongside the core phone system. It is the most feature-complete option in this list and priced accordingly.
- Best for: larger or multi-site organisations that want one vendor for phone, meetings and contact centre.
#2
Nextiva
Phone system as part of a customer-experience platform
Nextiva presents itself as a customer experience platform rather than a phone company, bundling business phone, contact centre and AI receptionist into one product.
- Best for: teams that want support, sales and phone in a single tool rather than integrated separately.
#3
Dialpad
Built around the AI layer
Dialpad describes itself as AI-native, built for human and AI agents working together, with transcription and real-time assistance central rather than added on.
- Best for: teams who want live transcription and call intelligence as a default, particularly sales and support.
#4
Zoom Phone
The option you may already own
Zoom Phone is a VoIP system with unlimited domestic calling, SMS, voicemail transcription and call recording, sold alongside the meetings product most companies already run.
- Best for: organisations already standardised on Zoom, where adding phone is a procurement question rather than a migration.
#5
Ooma
Small business, straightforward
Ooma offers a cloud phone system with VoIP calling, unified communications features and scalable pricing, aimed squarely at smaller businesses.
- Best for: small teams that want reliable phones without a platform to administer.
#6
Finn
When the problem is unanswered calls, not routing
Finn is not a cloud phone system, and it is worth being clear about that rather than pretending the categories are the same. It is an AI voice agent: it answers the call, handles the conversation, books the appointment, and transfers to a person when it should.
If your calls are reaching the right people and the issue is cost or flexibility, buy a phone system from the list above. If the issue is that calls go to voicemail after hours, during lunch, or when the front desk is already on the phone, a phone system will route those calls perfectly well to nobody.
- Best for: teams losing revenue to unanswered or after-hours calls, in healthcare, education and hospitality.
- Runs alongside your existing phone system rather than replacing it.
How to choose
- Calls reach people, you want lower cost or better apps — RingCentral, Zoom Phone or Ooma depending on size.
- You want phone and customer support in one platform — Nextiva.
- You want transcription and call intelligence by default — Dialpad.
- Calls are going unanswered — no phone system fixes that. See the AI receptionist hub.
The honest summary: these are not really five competitors and one outsider. They are two different purchases, and plenty of teams end up making both.
Frequently asked questions
- What is a cloud phone system?
- A phone system that runs over the internet rather than on hardware in your building. Calls route through the provider's network, so numbers, extensions, voicemail and routing are configured in software and staff can work from anywhere.
- Is a cloud phone system the same as an AI voice agent?
- No, and the distinction matters when choosing. A cloud phone system routes calls to people. An AI voice agent answers and handles the call itself. Most cloud providers now bundle some AI, but the core product is still the phone network underneath.
- Do you still need a cloud phone system if you have an AI voice agent?
- Often yes. The AI agent handles the calls you want automated; the phone system still carries the ones that reach a person. They usually sit alongside each other rather than one replacing the other.
- What should you look at when comparing cloud phone systems?
- How calls reach the right person, whether it works for remote and mobile staff, what happens to calls nobody answers, how it connects to your CRM and calendar, and what the per-seat cost becomes at your real headcount rather than the advertised entry tier.
Competitor details are based on public sources as of July 2026 and may change. Rankings reflect fit for cloud phone systems; verify current capabilities on each vendor's site.
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