The Best Phone Systems for Sales and Support Teams

Calling your customers should be simple. You pick up the phone, dial, and talk to them. If all goes well, after several conversations they buy from you. That’s the simple part.

After that, you have to keep them happy by quickly responding to their concerns usually over the phone or email. If you’re good, you check-in on them to see if they’re happy with you, every now and then.

To do this effectively, many things have to just work. Calls need to be made and received reliably, and conversations need to be tracked inside systems like CRMs or Helpdesk software so customers never feel like they’re talking to different people or need to repeat themselves. You can use great tools to coordinate, share context and hand-off conversations that feel like magic. The cornerstone of all this is a great business phone service.

We know first-hand what it is like to have choppy phone service and calls freezing in middle of high-stakes sales conversations. That’s why we’ve exhaustively tested and researched some of the best business phone/VOIP tools to come up with a recommendation we can stand behind and you can trust for your customer interactions. We’ve spoken to operators at companies at all growth stages (seed to IPO), and personally tested all the vendors across hundreds of calls and integration workflows.

Why trust us?

As an operator in venture-backed companies for the last decade, I’ve personally used business phone / VOIP systems end-to-end: from sourcing, evaluating, and integrating these services to making 1000s+ of calls over my career. I’ve built workflows to connect phone systems through several tools to scale GTM teams from pre-revenue to $MM+ revenue run rates. This guide is a distillation of that experience.

We combined that with a rigorous and exhaustive research process and speaking with power users from companies of all sizes. We independently verify vendor claims to help you distinguish reality from “forward-looking marketing.”

Since these tools are constantly changing, we will refresh this guide quarterly with updates and include a change log at the end so you can see what was updated. We will flag any inaccuracies in our error log.

If you have questions or feedback, please don’t hesitate to reach out directly: hi@thesaasaudit.com

Our Criteria

• Call Quality & Reliability: This is the deciding factor when feature sets are mostly comparable. The most experienced buyer we interviewed ran an RFP and migrated his entire ~1,100-person company off an incumbent for one reason: voice quality was poor in Asia, which was half of their business.
• Integrations: The phone system should integrate seamlessly with existing tools without requiring complex setup.
• Business Longevity/Future: There’s evidence that the company’s interests are aligned with their users (transparency) and that the business is sustainable enough to be around for a long time. Companies and users can feel comfortable adopting a tool that will fit their needs right now and for the foreseeable future.

Who is this guide for?

This guide is for B2B founders, operators, and GTM teams at growth-stage companies (100–1,000+ employees, Seed–Series D+) evaluating their first or replacement cloud phone system. They live in Salesforce, HubSpot, or Zendesk and need a phone system that works inside those systems (or similar tools). They want to avoid reps logging calls manually, deals falling through over inconsistent follow-ups, or support tickets with no context. They might have international operations that span multiple continents and need a phone service that’s reliable throughout those regions.

Important Category Distinction: Does your customer want to reach a specific person or a general pool of people?

UCaaS (Unified Communications as a Service):

• Business phone numbers, calling, texting, and conferencing for your team. For when a customer or prospect needs to reach a specific person (i.e., a specific rep or account owner). This guide discusses these tools from vendors like Aircall, Dialpad, RingCentral, and CloudTalk.

CCaaS (Contact Center as a Service):

• High-volume inbound/outbound queues with agent routing, IVR trees (e.g., “press 1 for English”), and workforce management (call audits). This is where 90% of your inbound volume comes in via phone/chat/email and is answered by interchangeable customer service reps/agents. Tools like Genesys, Five9, and Talkdesk live here.

A useful test from the buyers we spoke with: in a B2B motion you usually need a person-to-person number, so you’re shopping for UCaaS. If you’re looking for a high-volume B2C support motion, you often don’t need individual business numbers at all — instead you need a contact center (CCaaS). Some teams run both: UCaaS for sales, and CCaaS for managing the support queue.

Our picks:

Aircall

Aircall is a strong fit for sales and support teams that already work out of a CRM or help desk and want calling activity to live in the same place. It stands out as a way to connect calls, texts, notes, and follow-up work to the rest of your stack.

Call Quality & User Experience2.5/3★★★★★★

Everything in Aircall is designed around keeping your system of record clean and organized, and improving GTM rep efficiency by reducing manual admin. It loses out in terms of call quality for coverage outside the US to Dialpad, which had better quality in APAC.

Aircall also sells AI add-ons that can create call summaries, detect key topics, extract action items, and automate some follow-up work. You could always build these workflows yourself using no-code tools or the OpenAI API, but these features work well out of the box if you want the convenience for an additional $9/month.

Aircall guarantees 99.95% uptime, compared to the industry standard of 5 nines (99.999%).

Integrations3/3★★★★★★

What makes Aircall work best is the integration layer. The Essentials plan is $30/month and includes access to more than 250 integrations and API access, while the Professional plan for $50/month adds Salesforce CTI integration and more advanced workflow tools. Teams can keep calls and SMS tied to customer records instead of asking reps to log everything by hand. Aircall actually uses the Salesforce integration internally.

Business Longevity3/3★★★★★★

Aircall has raised $200M+ over 8 rounds from VCs like HubSpot Ventures, Goldman Sachs, and Balderton Capital.

Aircall feels established enough for most SMB and mid-market buyers, with solid ecosystem traction and steady product releases. Monthly release notes, newer AI launches, and recent M&A activity all point to an active business. Aircall has one of the more established customer bases out of the picks: Uber, Stripe, Adyen, Honeywell, and Constellation Brands.

Dialpad

Dialpad is best for teams that want a lower-cost option, with AI transcription bundled in, that don’t need a large integration ecosystem. We’d recommend Dialpad over the other picks if you specifically need voice quality and coverage outside of the US.

Call Quality & Reliability3/3★★★★★★

This is where Dialpad stands out. An expert we interviewed ran an RFP and migrated a 1,100+-person company off RingCentral specifically because Dialpad’s voice quality was significantly higher in the APAC region — where half their business was.

Dialpad is also appealing for smaller sales or support teams that want summaries and transcripts out of the box at a relatively low starting price. Its Connect Standard plan starts at $15 per user/month and includes unlimited calls, AI-powered meetings, real-time transcripts, and instant call summaries, while Pro starts at $25 per user/month and adds key CRM integrations plus 24/7 support.

Integrations2/3★★★★★★

Dialpad does not have as much integration depth as Aircall or RingCenteral. If you go with Dialpad, we recommend mapping out your workflow and integration needs so you can confirm that the Connect plan provides sufficient coverage. We found some sales and contact-center features sit deeper in plans comparatively. Feature parity might cost more or less depending on what matters to you and how it’s bundled.

Business Longevity3/3★★★★★★

Dialpad looks like the best mix of stability and momentum. They recently raised $170M at a $2.2B valuation. They have established customers like Motorola, RE/MAX, Toast, and Domo. They still ship like a company that’s trying to win, with monthly releases and an ambitious AI roadmap of core products.

RingEx / RingCentral

RingCentral is a stable incumbent with the broadest integration base. It’s the best pick for larger, established companies that want a safe choice. High-growth teams will find the call quality lacking in comparison to others. They ship less frequent updates and lack compelling AI features.

Call Quality & User Experience1.5/3★★★★★★

Call quality is strong in the US, but we found gaps when testing from Canadian numbers, and an expert we spoke to (an operator purchasing for a 1,100+ company) flagged gaps in APAC coverage as a reason to switch to Dialpad after an RFP.

Integrations3/3★★★★★★

RingCentral has the most integrations out of the group. Its App Gallery lists 500+ pre-built integrations like native CTI for Salesforce, HubSpot, and Zendesk that embed the full dialer inside the tool your reps already live in (click-to-call, screen pops on inbound, and automatic call logging — no manual entry). RingCentral works best if you have a sprawling software stack and you want one phone system that plugs into everything without building custom integrations.

Business Longevity3/3★★★★★★

RingCentral is the only public company in this comparison (NYSE: RNG since 2013) and did ~$2.5B in revenue in 2025. At this scale, this is the safest pick in terms of business longevity; it’s least likely to disappear or get acquired.

CloudTalk

CloudTalk is an earlier-stage company appealing to more mid‑market customers, and it competes well on price. CloudTalk is best at integrations like HubSpot, Pipedrive, Salesforce, and Zendesk. It comes with a modern interface and good analytics out of the box. It struggles against the other picks in terms of call quality and reliability. The company is a riskier pick than the more established players with better stability and call quality.

Call Quality & User Experience1.5/3★★★★★★

CloudTalk has an intuitive interface and seamless two-way integrations with CRMs. Call recording and analytics are helpful. CloudTalk does struggle with reliability at times: in our testing we experienced call drops and intermittent problems, and found the mobile app to be less functional than others.

Integrations2/3★★★★★★

CloudTalk ships native, two-way integrations with Salesforce, HubSpot, Pipedrive, Zendesk, and Intercom. We tested with Pipedrive and the call logging, click-to-call, and contact sync worked great out of the box.

It supports 90+ integrations, which is narrower than Aircall and RingCentral. All the important ones are there, but it’s worth checking if you’re using niche tools or workflows before picking CloudTalk.

Business Longevity1.5/3★★★★★★

CloudTalk is the highest-risk option in this set, mostly because it is the youngest and smallest business. The good news is that fresh funding and an aggressive AI strategy suggest real ambition, but compared with the others, it still looks earlier-stage and therefore more exposed if growth slows or the market consolidates.

Other vendors to consider:

Nextiva:

Best if you want one stable, US-focused vendor and you’re considering running a contact center.

OpenPhone (now Quo):

Best for smaller teams (<50 people): startups, solo founders, real estate, recruiting. It’s the lightest, cheapest, fastest-to-set-up option when RingCentral or Aircall feel like overkill.

JustCall:

Best for outbound-heavy sales teams that live in a CRM. It sits between a simple small-business phone and a full contact center: power and predictive dialers, conversation intelligence, local numbers in 70+ countries, and 100+ native integrations (Salesforce, HubSpot, Pipedrive, Zendesk), starting around $29/user/month and used by 6,000+ businesses.

Buyer Due Diligence

FAQs

I’m having call quality issues with my current provider. What do I do?

Since these systems work off of the internet, the best phone system will only be as reliable as your connection. If you have a remote distributed team, this is the best place to start sorting out call quality issues. If you’re using a phone app, it’s helpful to be able to switch between cellular and wifi.

Then, check for outages. If all systems are operational, you want to open a support ticket and walk through your issue. If your phone provider is too unreliable, you should look into other vendors. Native integrations are table stakes for most vendors we mentioned, so switching cost should be minimal.

How do I source and test these tools?

Smaller teams can trial and buy directly through vendor websites. Larger teams should speak with sales, confirm integrations, and get answers to industry/company-specific questions. Then, conduct a pilot with 3–5 vendors. This pilot should include a short head-to-head trial on real numbers in the countries you call, explicitly testing for call quality, coverage, and reliability. You want to know if there’s any freezing or coverage issues before you sign. Test integrations and AI features to ensure they work as advertised and as you intend to use them.

What about texting/SMS — and is it HIPAA-safe?

Native SMS is included in most of these tools and is fine for everyday rep texting. But it’s often a separate decision for two reasons. First, at real volume or for custom workflows, teams break SMS out to a programmable layer like Twilio. Second, for HIPAA: every vendor here will sign a BAA, but many (Dialpad, for example) exclude SMS/MMS from HIPAA scope, and standard SMS isn’t end-to-end encrypted anyway. So if you handle PHI, sign the BAA, confirm in writing whether texting is covered, and keep PHI out of the message body — or route compliant texting through a BAA-covered service like Twilio.

Questions for the Vendor

Ask upfront about any niche integrations you may need and confirm the level of support/features. For example, RingCentral lets you integrate with HubSpot and call directly inside it. Other vendors support HubSpot integration but with a different feature set. If this is important to you, it’s worth confirming the workflow you plan to build with your specific use case.

Ask about compliance for your specific industry and data flows (for example, ask about HIPAA and communicating over SMS with customers).

Ask about call quality in the specific regions you’ll be calling (e.g., if you have global operations or coverage in EMEA/APAC). You want to get trials with numbers in those geographies.

Ask for volume discounts if you’re buying for a larger team, bundled features you’d want, and more favorable contract terms (a better rate on multiple numbers).

Changelog / Corrections

5/24/2026 - v1.0 - Article Published