The 9 Best Cloud Phone Systems of 2026, Compared
22
MIN READ
October 30, 2026
The best cloud phone systems in 2026 are Retell AI, RingCentral, CloudTalk, Nextiva, Dialpad, Zoom Phone, 8x8, GoTo Connect and Quo. We compared each one on real per-seat cost after fees, SMS limits, CRM integrations, AI call handling and support, using each provider's own pricing pages and docs, checked in October 2026.
For smaller teams, see our guide to VoIP phone systems for small business.
If you run a 10 to 200-seat office, the hard part is rarely features. It is the gap between a "starting at $20" quote and the invoice that arrives, SMS caps that run out in week two, and calls that go to voicemail when no one is free. This guide covers all three.
| Feature | Retell AI | RingCentral | CloudTalk | Nextiva | Dialpad | Zoom Phone | 8x8 | GoTo Connect | Quo |
|---|---|---|---|---|---|---|---|---|---|
| Best For | AI call handling | CRM integrations | SMB outbound dialing | 24/7 support | AI transcription | Zoom-native teams | International calling | Visual routing | Under-10 teams |
| Pricing (start) | From $0.07/min, no per-seat fee | $20/user/mo (annual) | $25/user/mo (annual) | $15/user/mo (annual) | $15/user/mo (annual) | $16/user/mo (annual) | Quote-only | Quote-only | $15/user/mo (annual) |
| Call Quality | HD over IP | HD over IP | HD over IP | HD over IP | HD over IP | HD over IP | HD over IP | HD over IP | HD over IP |
| SIP/Telephony | Yes, bring-your-own | Managed | Managed | Managed | Managed | Managed | Managed | Managed | Managed |
| AI Call Handling | Native, full agents | AI Receptionist add-on, from $39/mo | AIVA on Expert tier | XBert AI Employee add-on, from $99/mo | AI Agents, billed per conversation | Post-call summaries included | Not published | AI Receptionist plan tier | Sona included, capped |
| SMS Cap (base plan) | None | 25/user/mo | No published cap | 100/user/mo | No published cap | US and Canada, no published cap | Not published | Not published | Unlimited US/Canada (fair use) |
| Concurrent Calls | 20 free, scalable | Per seat license | Per seat license | Per seat license | Per seat license | Per seat license | Per seat license | Per seat license | Per seat license |
| Post-Call Analytics | Structured, per call | Higher tier only | Conversation Intelligence add-on | 50 AI summaries on NEXT Core | Included | Higher tier | Not published | AI call summaries on CX plans | Basic |
| Compliance | SOC 2 Type I and II, HIPAA BAA, GDPR | SOC 2, HIPAA | SOC 2 Type II, HIPAA BAA, GDPR | SOC 2, HIPAA | SOC 2, HIPAA | SOC 2, HIPAA | SOC 2, HIPAA | SOC 2 | SOC 2 |
| Free Trial/Credit | $10 credits | 14-day trial | 14-day trial | None published | 14-day trial | Trial available, length not published | Not published | Not published | 7-day trial |
Pricing and plan details checked against each vendor's own pricing page, October 2026. 8x8 and GoTo Connect no longer publish per-seat rates.
A cloud phone system is a business phone service that runs over the internet from the provider's data centers instead of on PBX hardware in your office, so your team can make and take calls on a desk phone, laptop or mobile app. Cloud VoIP, hosted VoIP and cloud PBX are other names for the same thing. The modern cloud phone stack covers inbound routing, outbound dialing, SMS, voicemail, and usually a video or team chat layer bundled as UCaaS (unified communications as a service).
Several tools on this list now include some form of AI call handling, which changes what a cloud phone system can do when no one is free to answer.
What does it do? Retell AI is an AI voice agent platform that answers, qualifies, books and transfers calls on top of the phone system you already have. It does not replace your cloud phone system's seats, extensions or internal calling; it handles the calls your team cannot pick up.
Who is it for? Businesses whose bottleneck is answering calls rather than routing them, from 10-person clinics to large contact centers, and teams that want after-hours calls to end in a booked appointment instead of a voicemail.
Retell connects to your existing carrier or cloud phone system over SIP, including Twilio, Vonage and Telnyx, so you keep your numbers. The agent can book on Cal.com, read and update your CRM, and warm-transfer to a person with the conversation summary first. After each call, post call analysis logs the transcript, sentiment and any custom fields you define. Pine Park Health reports a 38% increase in scheduling NPS after moving patient scheduling calls to Retell.
Pros
Cons
Pricing: From $0.07 per minute, pay as you go, with no platform fee. $10 in free credits and 20 free concurrent calls on signup, with extra concurrency at $8 per call per month. Retell does not charge for telephony on your own SIP trunk. The pricing calculator shows exact per-minute costs by LLM and voice engine choice.
What does it do? A unified communications platform combining business phone, video, SMS, and fax, serving over 7 million users worldwide.
Who is it for? 20 to 500-seat businesses that live inside Salesforce, HubSpot, or Zendesk and need a phone system that plugs into 300+ third-party apps without custom work.
The catch is the invoice. On the Core plan, the 25-SMS-per-user cap runs out quickly for any team that texts customers. Real-world RingCentral invoices run 20 to 30% above the advertised per-user price once add-ons and regulatory fees land. Every RingEX plan now includes AI Virtual Assistant (AVA) at no extra cost. The AI Receptionist (AIR, from $39) and AI Conversation Expert (ACE, formerly RingSense, from $60/user/mo) remain paid add-ons. RingCX contact center starts at $65/agent/mo.
Pros
Cons
Pricing: Core $20/user/mo, Advanced $25/user/mo, Ultra $35/user/mo on annual billing; monthly billing is $30, $35 and $45. Advanced adds CRM integrations and 100 SMS per user; Ultra raises SMS to 200. RingCX contact center add-on starts at $65/user/mo.
What does it do? A cloud calling platform built for sales and support teams, with power, smart and predictive dialers in the base product.
Who is it for? SMB and mid-market B2B sales teams that dial from a CRM.
Inbound is where AIVA on the Expert tier matters. It picks up calls 24/7, runs custom call flows, qualifies leads, books meetings on Cal.com or Google Calendar, and warm-transfers to a human SDR with full context attached. The drag-and-drop IVR routes by skill, time of day, or caller history; a callback queue triggers automatic returns when an agent frees up. AI Conversation Intelligence transcribes every call in 50+ languages with topic extraction and sentiment scoring. 95+ native integrations cover HubSpot, Pipedrive, Salesforce, Zendesk, Intercom, and Microsoft Dynamics, with bi-directional sync logging every call to the deal record. SOC 2 Type II, HIPAA with BAA, and GDPR ship at the platform level.
Pros
Cons
Pricing: Starter $25/user/mo, Essential $29/user/mo, Expert $49/user/mo on annual billing; AIVA available on the Expert tier and a quote-based Custom plan.
What does it do? A unified communications platform bundling voice, video, team chat, SMS, and contact center with 24/7 live phone support on every plan.
Who is it for? 15 to 100-seat businesses that cannot afford an IT team and need to call an actual human when something breaks.
The portal itself is clean and the app bundles calling, texting, video, and team chat without the feature-toggling that makes RingCentral feel heavy. The trade-off is AI depth: Nextiva's AI tools are layered in carefully but they are not best-in-class for real-time transcription or coaching the way Dialpad's are, and if you want agentic AI handling the whole call you are buying a separate product. For a straightforward "we need a business phone that works and support that answers," Nextiva is the safest bet on this list.
Pros
Cons
Pricing: NEXT Core $15/user/mo, NEXT Engage $25/user/mo and NEXT Scale $75/user/mo on a 12-month small business term. Month to month, Core runs $23 and Engage $50.
The XBert AI Employee voice agent starts at $99/mo, and contact center plans start at $75/agent/mo. Regulatory fees and add-ons push real bills above the listed price.
What does it do? A VoIP platform built around voice intelligence that transcribes every call in real time and surfaces sentiment and coaching cues to managers.
Who is it for? Sales and support teams where coaching, QA, and conversation analytics drive performance.
What Dialpad is not: a deep contact center or a deep integrations platform. Its Salesforce and HubSpot hooks are solid but shallower than RingCentral's, and the Standard plan does not include 24/7 support, only the Pro plan at $25/user does. International numbers and the countries-supported list also require the Pro tier. If AI coaching is the primary reason you are shopping, Dialpad is best in class on this list. If you want broad UCaaS depth, look elsewhere.
Pros
Cons
Pricing: Standard $15/user/mo, Pro $25/user/mo, Enterprise quote-only (3-user minimum on Pro and above). Dialpad AI Agents bill per conversation from a pool of credits, charged only when the AI looks something up or takes an action.
What does it do? A cloud phone service that layers business calling into the Zoom app your team already uses for video.
Who is it for? Companies where Zoom Meetings is already deployed and the billing-consolidation savings outweigh deeper phone features.
The weaknesses show up once you need real call center features. Advanced analytics (live queue dashboards, custom KPIs, CSV exports) require a paid add-on pack. Pro Plus or Business Plus plans are required to get Zoom's full meeting capabilities alongside phone. International calling is metered on every plan. Zoom Phone works beautifully as a UCaaS layer for Zoom-first teams; it is not the strongest pick if you are building a serious support operation.
Pros
Cons
Pricing: US and Canada Unlimited $16/user/mo billed annually ($18 monthly), Pro Plus (Phone plus Zoom Workplace Pro) $20.50/user/mo and Business Plus $24.50/user/mo. Zoom's pricing page no longer lists the Metered plan.
What does it do? A UCaaS and contact center platform with one of the largest unlimited international calling footprints in the business phone market.
Who is it for? Mid-market and enterprise teams with customers in 30+ countries where per-minute international rates would otherwise balloon the phone bill.
The downsides are onboarding and pricing transparency. 8x8 does not publish pricing for its unified communications or contact center plans; every interaction requires a sales call, and quoted rates in the field land around $24 to $44/user/mo. The admin experience has a real learning curve compared to Nextiva or Zoom Phone, and some of the more advanced features exceed what most SMBs will ever use. 8x8 is the right pick for genuinely global operations; it is overbuilt for a 15-person office.
Pros
Cons
Pricing: 8x8 sells X Series plans by quote only. X2 includes unlimited calling to 14 countries and team chat; X4 adds unlimited calling to 48 countries, supervisor analytics and monitor, whisper and barge. Annual plans save up to 25%.
Third-party estimates put X2 at about $24/user/mo and X4 at about $44/user/mo. Contact center tiers (X6 and X8) are also quote-only. Budget for regulatory recovery fees and possible SMS/MMS surcharges on top.
What does it do? A cloud phone system with a color-coded visual dial plan editor that makes complex call routing easier to build and maintain.
Who is it for? IT teams and Microsoft Teams shops that want phone, video, and chat in one app with drag-and-drop routing.
The drawback is opacity. GoTo does not publish pricing; previous tiers started around $24/user/mo but the current structure is fully quote-based, which makes budget modeling impossible before a sales call. The base Phone System plan includes custom dial plans and unlimited auto attendants, but the AI receptionist, team inbox and AI call summaries sit on higher plans. Some shared-inbox and CRM features require the Customer Experience (CX) plan.
Pros
Cons
Pricing: GoTo Connect sells by quote across five plans: Phone System, Phone System + AI Receptionist, Customer Experience (CX), CX Complete and Contact Center. The AI plans include 100 AI Receptionist credits, with more for purchase.
GoTo does not publish per-seat rates, so ask for each tier in writing. AI call summaries, team inbox and ServiceNow or Zendesk integrations start on the CX plans.
What does it do? A lightweight business phone system built around shared team inboxes, where multiple teammates can view, assign, and comment on a single number's texts and calls.
Who is it for? Startups, solo founders, and teams under 10 people who want a modern app-first experience without the complexity of full UCaaS.
Since rebranding from OpenPhone in September 2025, Quo has significantly expanded its AI capabilities. The Sona AI agent, included on all plans, can handle sales, support, and customer conversations beyond just missed calls. This positions Quo as more than a basic phone system for small teams; it's now an AI-augmented communication platform, though Sona's automation depth is still lighter than dedicated AI voice agent platforms like Retell AI.
Quo is not trying to be a call center. There are no power dialers, no real-time agent analytics, no contact center tier, and no video meetings (you still need Zoom). The Starter plan at $15/user/mo covers basic calling and SMS; integrations with HubSpot and Salesforce live on the $23/user/mo Business tier. For a 3 to 8-person team, it is the cleanest starting point on this list. Past 25 users, almost any other option on this list scales better.
Pros
Cons
Pricing: Starter $15/user/mo, Business $23/user/mo, Scale $35/user/mo on annual billing (monthly billing runs $19, $33, and $47 respectively). All plans now include the Sona AI agent with 1,000 free automation credits/month, a significant addition since the September 2025 rebrand from OpenPhone. Additional Sona credit bundles start at $25/month.
SIP trunking is a way to carry business phone calls over the internet between a carrier, a cloud phone system and other services such as AI voice agents.
It lets you keep your numbers and your cloud phone system while an AI agent answers some or all of your calls. Your team keeps its extensions, apps and desk phones.
Retell AI connects over SIP to Twilio, Vonage, Telnyx or any SIP carrier. Retell does not charge for telephony when you use your own SIP trunk, according to its pricing page.
A typical setup takes three steps:
Some cloud phone systems also support bring your own carrier. Zoom, for example, offers a Zoom Phone Pro license for Bring-Your-Own-Carrier setups.
The per-user sticker price is almost never the real bill. I checked each platform's invoice structure for line fees, SMS overage rates, regulatory surcharges, and AI add-on pricing. RingCentral invoices typically land 20 to 30% above the advertised price once fees apply, which changes the math at scale.
For the 2026 market, "does the phone ring the right seat" is table stakes. The real question is what the system does when nobody picks up. Missed calls rarely call back, so I weighted after-hours automation and AI call handling heavily.
SMS caps burned more teams in my interviews than any other hidden cost. A 25-texts-per-user cap on a Core plan is not a theoretical limit for support teams; it is a first-week overage charge. I documented each plan's base cap and overage rate.
Every platform claims Salesforce and HubSpot integration. What matters is whether the integration logs calls to the right record automatically, syncs custom fields, and triggers workflows, or whether it is a CTI click-to-dial button with nothing behind it. I tested the real sync behavior, not the logo count.
24/7 after-hours call answering: Callers who reach voicemail often hang up without leaving a message. An AI voice agent layered onto your cloud phone system as an AI answering service converts those missed calls into booked appointments without adding headcount.
Appointment booking with live calendar sync: Healthcare, home services, and legal practices lose high-value appointments to phone tag. Real-time function calling to Cal.com, Google Calendar, or an EHR lets a voice agent book appointments during the call instead of promising a callback.
Replacing legacy IVR menus: "Press 1 for billing" routes calls; it does not handle them. A modern AI IVR understands intent, holds a conversation, and routes based on what the caller actually needs. That upgrade keeps callers who would otherwise give up on a menu tree.
Outbound sales dialing at scale: Traditional cloud phones handle one call per user per minute. Batch calling infrastructure handles thousands of calls per hour with branded caller ID, lead qualification, and automatic CRM updates, the difference between a 200-dial-per-day rep and a campaign that runs overnight.
Inbound lead qualification before human handoff: Inbound leads cool fast, and routing every call to a human BDR wastes time on unqualified traffic. Lead qualification by a voice agent ahead of warm transfer routes only ready-to-buy callers to sales.
Multi-location receptionist coverage: Small offices and multi-site service businesses often staff a receptionist at every site. A single voice agent covers every location, routes to the right person, books appointments, and forwards urgent calls for a fraction of the cost.
Hidden fees that break budget models: Nearly every traditional UCaaS vendor publishes a per-user price that omits line fees, SMS overage, regulatory charges, and AI add-ons. Real invoices commonly land 20 to 30% above quote, and cancellation friction is the single biggest complaint across customer reviews on Trustpilot.
SMS caps disguised as unlimited plans: Base tiers from RingCentral (25 SMS/user), Ooma (250/account), and Vonage all cap text messaging in ways that are invisible until the first overage bill. Compliance and Campaign Registry approval delays can also block SMS launches for weeks.
AI features sold as separate subscriptions: Most UCaaS vendors charge $39 to $60 per user per month in add-ons for AI receptionist, conversation intelligence, or transcription. This stacks on top of the base license, doubling the per-seat cost once AI is included.
Compliance certifications that sound the same but are not: SOC 2 Type I differs materially from Type II. HIPAA BAA availability varies by plan and sometimes by add-on. Buyers in healthcare and finance need to confirm the specific certification and whether it is included on their chosen tier.
Scaling math that favors automation: Once call volume crosses a certain threshold, adding seats to a UCaaS plan costs more than automating the call itself.
Traditional UCaaS platforms (RingCentral, Nextiva, Dialpad) price per seat, so scaling call volume means scaling licenses. AI voice agents bill per minute, from $0.07 per minute, and one agent handles many concurrent calls without additional seats, which is why high-volume teams pair a cloud phone system with an AI call bot for overflow.
Nextiva NEXT Core, Dialpad Standard and Quo Starter share the lowest published entry price at $15/user/mo billed annually. Zoom Phone's US and Canada Unlimited plan follows at $16/user/mo.
If most of your volume is inbound calls rather than internal calling, a pay-as-you-go AI voice agent from $0.07 per minute can cost less than adding seats.
Nextiva, Dialpad, and Quo include functional SMS without hard caps on their base plans. RingCentral Core caps SMS at 25/user/mo, low enough that most support teams hit overages within the first week, and even the Ultra plan caps at 200 per user.
Not directly. Retell AI handles the calls; a traditional cloud phone system routes them between human users and manages internal communication. Many businesses run Retell AI alongside their existing UCaaS for call center automation and after-hours coverage, keeping the UCaaS layer for internal calling and video.
Porting a US business number typically takes 1 to 3 weeks depending on the losing carrier. Some providers lock numbers or require formal LOA forms. Call forwarding from the old system to a new provider can route calls immediately while the port is processed, avoiding downtime.
Nextiva, RingCentral, and Retell AI all offer HIPAA BAAs. Retell AI includes a self-service BAA portal and HIPAA compliance in its base tier, while most UCaaS vendors require a specific plan or enterprise agreement. Pine Park Health uses Retell AI for patient scheduling and reports a 38% increase in scheduling NPS.
Per-seat UCaaS plans scale concurrency with license count, one user typically supports one to two concurrent calls. Retell AI includes 20 free concurrent calls on every account with custom enterprise concurrency, which is why high-volume inbound operations and outbound campaigns end up pairing the two.
VoIP is the technology that carries a call over the internet. A cloud phone system is the full business service built on it: numbers, routing, voicemail, SMS, apps and admin, run by a provider in the cloud. For a side-by-side of business VoIP providers, see our VoIP guide.
Start with three questions:
1. What is your real bottleneck: routing calls or handling them? If your team needs better internal communication, video meetings, and CRM-connected calling, a UCaaS platform like RingCentral, Nextiva, or Dialpad fits. If your bottleneck is unanswered calls, after-hours coverage, or high call volume that exceeds your team's capacity, an AI voice agent platform like Retell AI solves a different problem entirely.
2. How many users and what is your monthly budget? Per-seat UCaaS pricing ranges from $15/user/mo (Nextiva NEXT Core, Dialpad Standard or Quo Starter) to $75/user/mo (Nextiva NEXT Scale). Multiply by your headcount and add 20-30% for hidden fees, SMS overages, and AI add-ons. If the number is uncomfortable, compare against pay-per-minute AI agents from $0.07 per minute.
3. What integrations are non-negotiable? If your team lives in Salesforce or HubSpot, CRM integration depth matters more than price, RingCentral leads here. If you need international calling, 8x8's 48-country unlimited plans are hard to beat. If you need HIPAA compliance, confirm BAA availability on your chosen tier, not just the enterprise plan. Avoid choosing based on the feature comparison chart alone. Test call quality on your actual internet connection, check the real invoice (not the advertised price), and confirm that the features you need aren't gated behind a higher tier or paid add-on.
For remote teams, the most important factors are mobile app quality, call quality on variable internet connections, and collaboration features that work across time zones.
For under-10 remote teams: Quo (formerly OpenPhone) at $15/user/mo offers shared inboxes, the Sona AI agent for missed calls, and a clean mobile app, the simplest option for small distributed teams.
For 10-50 remote teams needing CRM integration: RingCentral's Advanced plan ($25/user/mo) connects to 300+ apps and provides 99.999% uptime. Dialpad ($15/user/mo Standard) offers superior AI transcription that helps remote managers review calls without listening to full recordings.
For international teams across 5+ countries: 8x8's advanced plans include unlimited calling to 48+ countries, eliminating per-minute international charges that can destroy remote team budgets. GoTo Connect includes free international calling to select regions on all plans.
For remote teams with high inbound volume: Retell AI handles overflow and after-hours calls without adding user seats, particularly valuable for remote teams spanning multiple time zones where someone always needs to be "on" but no one wants 3 AM shifts.
It depends on what you mean by "AI features":
Best AI call transcription and coaching: Dialpad. Real-time transcription is included on the $15/user/mo Standard plan with ~94% accuracy, live sentiment analysis, and AI-generated call summaries. No other UCaaS platform matches this at the base tier.
Best AI call handling (agent that answers and resolves calls): Retell AI. The AI voice agent handles entire conversations, qualifying leads, booking appointments, answering questions, processing requests. This is not an AI add-on bolted onto a phone system; it handles the call itself.
Best AI add-on to an existing phone system: RingCentral. RingCentral's AI Virtual Assistant (AVA, included in RingEX at no extra cost) provides real-time note-taking, call summaries, and translation. The AI Receptionist (AIR, $39+/mo add-on) handles 24/7 answering and routing for 8,300+ customers.
Important distinction: most UCaaS vendors charge $39-$60/user/mo extra for AI features. Retell AI and Dialpad include their core AI capabilities in the base product. Always check whether "AI-powered" in a vendor\'s marketing means included or add-on.
Yes. Most teams forward overflow or after-hours calls to the agent, or connect it over SIP trunking so they keep their numbers. Retell AI works with Twilio, Vonage, Telnyx or any SIP carrier and does not charge for telephony on your own SIP trunk.
See how much your business could save by switching to AI-powered voice agents.
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