TL;DR
- A modern business phone system runs over the internet and routes calls to the right person with features like auto attendants, call queues, and voicemail.
- The top options include SuperU AI, RingCentral, Zoom Phone, 8x8, and Dialpad. Each covers the basics and adds AI features in different ways.
- Costs vary by model: per minute (AI calling) or per user (seats). See the pricing table below for official numbers.
What is a Business Telephone System?
A business telephone system lets your team make and receive calls, route callers, hold voicemails, and log activity across devices. Cloud systems remove on site PBX hardware and let you manage everything in a web app. You can set up call flows, route by department, and track performance.
How Do Business Telephone Systems Work?
You sign up with a provider, assign numbers to users or agents, and build call flows. Auto attendants greet callers and route them. Call queues hold callers until an agent is free. Admins manage users, roles, and policies in one dashboard.
Types of Business Telephone Systems
- Cloud phone systems (VoIP): Hosted by the vendor. Easy setup. Flexible pricing. Rich features.
- Virtual phone systems: App first experience for mobile and distributed teams.
- AI voice systems: Automate inbound and outbound calls with realistic agents. Priced by minutes and scale.
Core Features You Should Expect
| Provider | Core calling features | Routing & admin | AI & extras |
|---|---|---|---|
| superU AI | Inbound and outbound live voice agents | No code builder to create and deploy agents, call recording | Scale to 1M calls/day, low latency voice UX (~500 ms) |
| RingCentral | Calling, SMS, fax in one app | Auto attendant, call queues, roles & permissions | AI features across UC, analytics |
| Zoom Phone | Softphone apps across devices | Multi level auto attendants, call queues | Voicemail transcription, contact center integrations |
| 8x8 | Cloud PBX, unlimited calling, SMS | Multi level auto attendant, visual voicemail | Global coverage and X Series options |
| Dialpad | Calling, messaging, meetings | IVR, call recording | Real time AI transcription and call summaries |
The top 5 options you can choose from
- SuperU AI

- You want AI agents to answer or place calls without IVR trees.
- You prefer per minute pricing and fast rollout with no telephony setup.
- You need to scale to high concurrency and 24/7 availability.
- RingCentral
- You need an all in one UC platform with phone, SMS, fax, and analytics.
- You want mature auto attendants, queues, and strong admin controls.
- You prefer seat based pricing and a large app ecosystem.
- You need an all in one UC platform with phone, SMS, fax, and analytics.
- Zoom Phone
- Your teams already use Zoom and want phone in the same app.
- You need multi level auto attendants and queues with simple admin.
- You want clear metered or unlimited per user plans.
- Your teams already use Zoom and want phone in the same app.
- 8x8
- You need cloud PBX, global calling, and X Series bundles.
- You want multi level attendants and visual voicemail.
- You want pricing that starts low with upgrade paths.
- You need cloud PBX, global calling, and X Series bundles.
- Dialpad
- You want a unified app with calling, messaging, and meetings.
- You value AI transcription and call summaries out of the box.
- You need simple per user pricing that starts at $15.
- You want a unified app with calling, messaging, and meetings.
Costs You Need to Plan For
Prices are US unless noted. Vendors update pricing, so confirm before purchase.
| Provider | Base price (entry) | What’s included at entry | Notable add ons |
|---|---|---|---|
| SuperU AI | Pay as you go $0.10/min (connected call). | No monthly fee on PAYG, no code builder, 1 concurrent call on starter. | Pricing scales by minutes. Focus on AI agent calls, not seat licenses. |
| RingCentral (RingEX) | Core from $20/user/mo annual or $30 monthly | Cloud phone, messaging, video in one suite. | Extra phone numbers from $4.99/mo each. Annual discounts available. |
| Zoom Phone | Metered from $10/user/mo, US/Canada Unlimited from $15/user/mo, Pro Global Select from $20/user/mo. | Softphone apps, domestic calling based on plan, admin portal, SMS/MMS (domestic). | Optional add ons for global calling and hardware. |
| 8x8 | Starts at $15/user/mo for business phone plans. | Cloud PBX with unlimited calling options, X Series tiers. | Country specific X Series pricing varies. |
| Dialpad | Standard $15/user/mo (annual). Pro $25/user/mo. | Calling, messaging, meetings, AI features like live transcription. | Enterprise tier via sales. |
Compare Options at a Glance
Use this quick view to align the model to your needs.
| Type | Best for | Why it works | Trade offs |
|---|---|---|---|
| AI voice (SuperU AI) | Automating inbound and outbound calls without IVR menus | Fast setup, pay per minute, scales to large volumes | Per minute costs vary with usage |
| RingCentral | Teams wanting unified phone, messaging, video | Mature features, deep admin, strong ecosystem | Seat costs add up at scale |
| Zoom Phone | Teams already on Zoom | Tight integration, clear plan tiers | International calling needs add ons |
| 8x8 | Global calling and PBX depth | Multi level attendants, X Series flexibility | Pricing varies by country and bundle |
| Dialpad | Small to mid teams wanting AI transcription and simple pricing | Simple AI summaries, clean app | Some advanced features at higher tiers |
How to Choose Step by Step
1. Map your call flows. Write the greetings, hours, and who should answer which calls. If you want zero menus, pick an AI agent approach. If you want seat based staffing, pick a UCaaS plan.
2. Pick your model. Per minute AI automation vs per user seats. Match model to volume and staffing.
3. Trial with real calls. Build a basic flow, set auto attendants or an AI agent, and place test calls. Use queues and rules to control overflow.
4. Check admin controls. Roles, permissions, number management, and logs save time at scale.
5. Plan rollout. Provision numbers, port where needed, record greetings, train staff, and go live in phases.
Integrations That Save Time
Phone systems work best when they connect to your tools. RingCentral, Zoom, 8x8, and Dialpad all promote integrations with CRMs, help desks, and productivity suites. Map two or three workflows that pay off fast, like logging calls to your CRM or triggering tasks from missed calls.
Setup and Rollout Plan
- Numbers: Buy or port numbers. If you need many numbers, check per number pricing. Example: RingCentral lists extra local or toll free numbers at $4.99/month.
- Users or minutes: Choose per user seats (RingCentral, Zoom, 8x8, Dialpad) or per minute AI calling (SuperU).
- Call flow: Configure auto attendants and queues or train an AI agent to handle intents and handoffs.
- Testing: Place live calls, measure abandonment, and tune prompts or routing.
- Go live: Roll out to one team, monitor, then expand.
Use Cases by Team Size
- Solo or very small teams: Use Dialpad or Zoom Phone entry tiers for low seat costs. Or use SuperU to automate callbacks without hiring.
- Growing SMB: RingCentral or 8x8 for deeper admin and queues. SuperU if you need always on coverage or high volume campaigns.
- Multi site or hybrid: RingCentral, 8x8, and Zoom Phone support global coverage and device flexibility.
- High volume outreach: SuperU automates outbound at scale with consistent voice and fast response.
Conclusion
You have two clear paths for a telephone systems for business setup. If you want automation, consistent caller experience, and cost that tracks actual usage, start with SuperU AI. You pay by the minute, skip IVR menus, and scale to heavy call volumes when you need it.
If you prefer a traditional seat model with phones, softphones, and manual handling, go with RingCentral, Zoom Phone, 8x8, or Dialpad. All four bring mature PBX features and solid admin controls. The right choice comes down to how you handle calls: automate with AI versus staff with users.

