7 Best OnSIP Alternatives in 2026 - With Pricing They Won't Show You
Two ownership changes in two years. First Intrado in 2020, then Ooma scooped up OnSIP for $9.75 million in mid-2022. If you're one of the ~50,000 SMB users looking for OnSIP alternatives, you're not paranoid - you're practical. We've tested all seven of these replacements, and here's what's actually worth your time.
What Happened to OnSIP
OnSIP started as a solid independent hosted PBX. Intrado acquired it in August 2020, riding a COVID-era UCaaS boom that saw interest spike 86%. Less than two years later, Ooma bought it for under $10M - a number that tells you exactly where the product sat competitively.
Current pricing runs $18.95/user/mo on the Unlimited plan (5-user minimum) or $49.95/account on the Basic plan plus 3.2c/min for calls. It's not shutting down. But two acquisitions in quick succession tend to mean one thing for product investment: maintenance mode. If you're planning your phone stack for the next 2-3 years, it's worth looking around.
Our Top Picks
- Nextiva - Best all-around OnSIP replacement. HIPAA compliant, 99.999% uptime, starts at $15/user/mo.
- OpenPhone (Quo) - Best for teams of 1-3 who want dead-simple UX. From $15/user/mo, no seat minimum.
- Dialpad - Best for AI-first teams who want transcription and call summaries baked in. From ~$15/user/mo.
Quick Pricing Comparison
Monthly pricing is where vendors quietly make their margin - the gap is often ~30% just based on billing cadence.
| Tool | Price Range | HIPAA | Best For |
|---|---|---|---|
| Nextiva | $15-$20/user/mo | Yes | All-around UCaaS |
| OpenPhone | $15-$19/user/mo | No | Tiny teams |
| Dialpad | ~$15-$23/user/mo | Yes | AI transcription |
| RingCentral | $20-$30/user/mo | Yes | Enterprise scale |
| CloudTalk | ~$19-$27/user/mo | Yes | Sales dialers |
| Aircall | ~$30-$40/user/mo | No | Support teams (3+ seats) |
| Grasshopper | $14/mo flat | No | Solo virtual number |
Annual pricing is the low end; monthly billing is the high end. Seat minimums noted in each tool section below.
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The 7 Best OnSIP Alternatives
Nextiva
Use this if you need a true OnSIP replacement that checks every compliance box. Nextiva runs eight data centers, holds HIPAA/PCI/SOC 2 certifications, and delivers 99.999% uptime. Core starts at $15/user/mo, Engage at $25, and Power Suite CX at $75 for full contact center features. No seat minimum on published pricing.
The r/sysadmin consensus is mostly positive - iPhone and desktop apps "work well," and support is "slow but helpful." In our testing, the Android app had some rough edges around call group caller ID, but nothing that'd stop us from recommending it. For teams migrating off OnSIP who need HIPAA compliance and don't want to think about it again for three years, this is the safest bet.
Skip this if you're a solo operator who doesn't need compliance overhead. You'd be paying for infrastructure you won't use.
OpenPhone (Quo)
Use this if you're a team of one to three and you want the simplest possible business phone. Starter runs $15/user/mo annually ($19 monthly), Business is $23/$33, and Scale is $35/$47. No seat minimum. Extra numbers cost $5/mo each, and there's a free trial.
Quo (formerly OpenPhone) is still what most people search for by the old name. The product is clean, mobile-first, and deliberately lightweight - shared inboxes, basic call routing, and that's about it.
Skip this if you need HIPAA compliance, call center queues, or anything beyond straightforward voice and SMS. This isn't a UCaaS platform; it's a business phone number done right.
Dialpad
Use this if you want AI doing the heavy lifting on every call. Dialpad bakes transcription and call summaries into paid tiers - no add-on required. Plans start around $15/user/mo annually and scale to ~$35 for the full suite, with a 14-day free trial available.
PCMag's 2026 VoIP roundup flags AI as the key differentiator in VoIP right now, and Dialpad leans into that harder than anyone else at this price point. HIPAA-compliant plans are available on request.
Skip this if you just need basic phones and don't care about transcription. You'd be paying for AI features that sit unused.
RingCentral
PCMag Editors' Choice for 2026, and for good reason - the integration ecosystem is massive and AI-powered call summaries land on higher tiers. Core runs $20/user/mo annual or $30 monthly, Advanced at $25/$35, Ultra at $35/$45.
Here's the catch: SMS caps are brutal. Core gives you 25 messages/user/mo. Advanced bumps to 100, Ultra to 200. Need more? That's a $25/mo SMS Booster add-on. Call Queues Booster runs $35/mo on top of that. The r/sysadmin thread echoes what we've heard from customers too: RingCentral works great until something breaks, then support "points the finger" instead of troubleshooting. Everything starts feeling like an add-on.
Let's be honest - RingCentral is the best platform on this list for companies over 50 seats. Below that, you're paying enterprise tax for features you'll never configure.
CloudTalk
CloudTalk is purpose-built for outbound sales teams, and it shows. Lite starts at ~$19/user/mo billed annually (~$27 monthly), with SOC 2 and HIPAA compliance and 24/7 chat and email support on all plans. For teams that just need a solid dialer with CRM integrations, the base tier delivers.
But watch the add-ons. AI conversation intelligence costs $9/user/mo extra. The parallel dialer - the feature most sales teams actually want - runs $39/user/mo. Expert plan requires a 3-license minimum. What looks like a $19/mo tool can quickly become a $60+/mo tool once you bolt on the features that matter. We've seen this catch multiple teams off guard during onboarding, and it's frustrating because the core product is genuinely good.
Aircall
Aircall is the pick for support teams already living in HubSpot, Salesforce, or Zendesk. Clean CRM integrations, and a UI that support reps actually like using. Plans run ~$30-$70/user/mo depending on tier.
The dealbreaker for small teams: a 3-seat minimum on Essentials and Professional, jumping to 25 seats on Custom. If you're a team of two replacing OnSIP, Aircall literally won't sell to you. The per-seat pricing is also on the higher end for what's essentially a cloud phone with good integrations - you're paying for the ecosystem, not the dialtone.
Grasshopper
Grasshopper starts at $14/mo (True Solo) and goes to $80/mo (Small Business). Here's the thing - it's not a phone system. It's a virtual business number that forwards to your personal phone. Not HIPAA compliant. Fine for a freelancer who needs a second number, but don't confuse it with a real UCaaS replacement.
Hidden Costs to Watch For
Most of these vendors make their real money on things that aren't on the pricing page. Here's what to budget for:
- Seat minimums: Aircall requires 3 users. CloudTalk's Expert plan requires 3. OnSIP's own Unlimited plan requires 5. If you're a team of two, half these tools won't work.
- Monthly vs. annual gaps: RingCentral Core jumps from $20 to $30 just by billing monthly. That's a 50% premium for flexibility.
- SMS caps: RingCentral Core gives you 25 texts per user per month. That's barely enough for appointment confirmations.
- Add-on traps: CloudTalk's parallel dialer at $39/user/mo costs more than most base plans on this list.
- HIPAA gaps: Grasshopper and OpenPhone aren't HIPAA compliant. If you're in healthcare, that eliminates them immediately.
Make Your Calls Count
A new phone system is only as good as the data feeding it. You can upgrade to the best VoIP platform on this list and still waste half your call blocks dialing disconnected numbers - we've watched teams do exactly that after a migration, burning through their first month excited about new features while calling dead leads.
Prospeo covers 125M+ verified mobile numbers with a 30% pickup rate, plus 143M+ verified emails at 98% accuracy. Data refreshes every 7 days, not every 6 weeks like most providers. There's a free tier so you can test it before your team finishes migrating off OnSIP.
Evaluating sales dialers like CloudTalk or Aircall? The dialer is only half the equation. Prospeo delivers 98% accurate emails and verified direct dials at $0.01/lead - so every call your team makes has a real person on the other end.
Your new phone stack deserves data that picks up.
FAQ
Is OnSIP shutting down?
No. Ooma acquired OnSIP in 2022 for $9.75 million and continues to operate it. That said, two ownership changes in two years have left many customers uncertain about the product's long-term roadmap, which is why teams are evaluating replacements now.
What's the cheapest alternative to OnSIP?
Grasshopper starts at $14/month and OpenPhone at $15/user/month with no seat minimum. Grasshopper is a virtual number only, not a full phone system. For a real UCaaS platform, OpenPhone Starter or Nextiva Core at $15/user/mo are the most affordable options.
Which VoIP providers are HIPAA compliant?
Nextiva, Dialpad, RingCentral, and CloudTalk all offer HIPAA-compliant plans. Grasshopper and OpenPhone aren't. Always confirm BAA availability directly with the vendor before signing a contract - compliance claims on marketing pages don't always match what's in the actual agreement.
How do I keep outbound data accurate after switching?
Use a verification tool like Prospeo to validate emails and phone numbers before importing them into your new system. Bad data burns call blocks and tanks deliverability regardless of which platform you choose.