Cloudonix
Cloudonix is an agnostic voice infrastructure platform that links AI voice agents to any SIP telephony system. It supplies call-control APIs, web and mobile SDKs, elastic SIP trunking and a built-in SBC, billed per session.
What is Cloudonix?
Cloudonix is a voice communications infrastructure platform published by Cloudonix Inc., a New York company founded by Nir Simionovich, Oded Arbel and Eric Klein. It describes itself as an agnostic infrastructure whose purpose is to let businesses connect, control and scale their voice agents on any platform, anywhere in the world. The site claims support for more than thirty AI voice agent platforms and a connection between a business phone system and an agent in under five minutes.
The offer is organised around three promises. Connect covers agentic voice trunking, ultra elastic SIP trunking and a built-in session border controller that handles transcoding and TCP, UDP or TLS negotiation, so any SIP carrier, cloud platform, IP phone or on-premise PBX can be attached. Control covers the call-control and management APIs that go beyond a simple hand-off: supervised transfers, conferences, silent coaching, outbound calling. Scale covers geographic reach, with India and the United Arab Emirates named as markets the platform opens up.
Developers work with CXML, the vendor's own voice application markup language, or with JavaScript container applications the site compares to AWS Lambda and GCP Functions. Web, Android and iOS SDKs embed calling into existing products, and an API playground built on OpenAPI sits in the developer portal. Teams without a developer build their call flows in the Make application instead.
Artificial intelligence is present in two ways. Text-to-speech, speech-to-text and LLM services are metered as AI minutes and reachable from the SAY and GATHER CXML verbs, and three reference agents are published: VickyAI, an office receptionist, PatAI, an in-room hospitality attendant, and BrianAI, a voice front end for an LLM. Cloudonix is candid about the boundary: these verbs are meant for synchronous operations, and platforms such as ReTell or VAPI, which need asynchronous streaming, are connected rather than replaced.
Billing is per session rather than per minute, and the company sells neither phone numbers nor call minutes. Compliance claims include ISO/IEC 27001:2013, GDPR, CCPA and HIPAA with a business associate addendum.
What it does
- Connect any AI voice agent to any cloud or on-premise phone system
- Keep an existing SIP carrier, PBX and numbers through bring-your-own-carrier trunking
- Write call flows in CXML or in JavaScript container applications
- Build voice automations without code through the Make application
- Embed calling into web, Android and iOS apps with the Cloudonix SDKs
- Run supervised transfers, conferences and silent coaching through call-control APIs
- Add call tracking and push call data into a CRM or ERP system
When to use Cloudonix / When not to
A quick filter to help you decide if Cloudonix is the right fit.
When to use Cloudonix
- Developers embedding voice calling into a mobile or web application through the Cloudonix SDKs
- Teams already running an AI voice agent on VAPI, ReTell, Synthflow, Dasha or SuperDash who need it to reach real phone lines
- Agencies adding call tracking and CRM or ERP attribution on top of their clients' media spend
- Telecom operators, MSPs and CPaaS, CCaaS or UCaaS providers adding programmable voice to an existing system
- Businesses that want to keep their own carrier, PBX and phone numbers while modernising their call flows
When not to use Cloudonix
- Buyers looking for phone numbers or call minutes, which Cloudonix does not sell
- Teams that want a turnkey conversational agent rather than the infrastructure connecting one
- Projects needing the asynchronous media streaming the platform states it does not provide
- Non-technical users with no developer on hand and no appetite for the Make no-code builder
- Organisations that require a published DPA, a named EU representative or a documented hosting jurisdiction
How to use Cloudonix
A typical end-to-end flow, from setup to results.
- Open an account from the Signup button, which leads to cockpit.cloudonix.io and a social login; no credit card is required
- Use the 14-day trial, after which an account without card details falls back to 1,000 sessions per month and 2 active calls
- For developers, start with the Start Here Guide in the developer portal, then the First Application Tutorial
- For non-developers, open the Make application and assemble the call flow visually instead
- Attach an existing carrier, PBX or SIP equipment through trunk management, checking the published compatibility list first
- Write the routing scenario as a CXML document, served either by a container application or by a remote webhook
- Add dynamic logic in JavaScript inside a container application when static CXML is not enough
- Connect the AI voice agent platform with the DIAL Service verb, or provision a full SIP trunk when required
- Embed calling into a mobile or web product with the SDKs, an integration the site announces at around fifteen minutes
- Get help through the community Discord, the Discord ticket channel, or a one-hour remote training session with a solution engineer
Pros & Cons
Pros
- Vendor-agnostic by design: existing carriers, PBXs and phone numbers can be kept
- Per-session billing instead of per-minute, with every feature included in every paid tier
- Public, itemised pricing with quotas, upgrade prices and overage rates all stated
- A permanent free plan on top of a 14-day trial, with no credit card at sign-up
- Two entry points side by side: CXML or JavaScript for developers, Make for everyone else
- Documented compliance posture: ISO/IEC 27001:2013, GDPR, CCPA and HIPAA with a BAA
- Open source repositories, a community Discord and a well-furnished developer portal
Cons
- The privacy policy is still the June 2019 version while the terms were rewritten in August 2025
- No DPA, no Article 27 EU representative, no named DPO and no disclosed hosting country or region
- Legal and privacy contacts sit on cloudonix.io, a neighbouring domain rather than the site's own
- The pricing page contradicts itself: 500 versus 1,000 free sessions, and a FAQ quoting 89 USD where the card says 119 USD
- No list of supported interface or processing languages is published anywhere on the site
- No end-user mobile application: only SDKs to integrate, and one navigation link to the SDK page returns a 404
- Nothing is published about AI model training on customer data, and no opt-out is offered
Pricing & Plans
Cloudonix offers a permanent free plan, Forever Free, priced at 0 USD per month, in addition to a 14-day trial that requires no credit card. The cheapest paid entry point is the Starter package at 69.00 USD per month on monthly billing, or 55 USD per month when paid annually under the 12% annual discount. Package upgrades are billed monthly on top of the subscription, and usage beyond a package allowance is charged as overage.
- 0 USD per month - 500 sessions and 2 active calls (the FAQ states 1
- 000 sessions per month
- an inconsistency on the site itself)
- 69 USD per month
- or 55 USD per month billed annually - 10
- 000 sessions and 5 active calls
- 119 USD per month
- or 95 USD per month billed annually - 25
- 000 sessions and 10 active calls
- 189 USD per month
- or 152 USD per month billed annually - 50
- 000 sessions and 10 active calls
- 299 USD per month
- or 239 USD per month billed annually - 150
- 000 sessions and 10 active calls
- quoted individually
- for needs beyond 500
- 000 sessions per month or 150 active calls
- 18 USD for 180 extra AI minutes
- 79 USD for 25
- 000 extra sessions
- 120 USD for 10 extra concurrent channels
Data, GDPR & hosting
A consolidated view of how Cloudonix handles your data.
GDPR overview
The compliance page explicitly claims GDPR compliance, alongside CCPA, HIPAA and an ISO/IEC 27001:2013 certification. The argument given is that Cloudonix, as an infrastructure provider, keeps only the call information the law requires, does not track end users, and collects data solely from customers and partners for billing and technical support. The privacy policy presents consent as the only lawful basis and opens access, rectification, erasure and objection rights by email to privacy@cloudonix.io, after the request has been authenticated. Concrete gaps remain: no Data Processing Agreement is published, no Article 27 EU representative and no data protection officer are named, no hosting country is disclosed, and the privacy policy itself is still the June 2019 version while the terms were rewritten in 2025. Governing law is the State of New York.
Who owns the data?
Under the Terms of Service in force since 1 August 2025, the customer owns all right, title and interest in the Customer Data, including data derived from it and returned as part of the Services. Cloudonix keeps ownership of the Services, the software, every improvement made to them and the related intellectual property. The company also reserves the right to collect and analyse information about the provision, use and performance of the Services, to reuse it for development, diagnostic and corrective purposes, and to disclose it only in aggregated or otherwise de-identified form. The compliance page adds that Cloudonix neither retains nor manipulates the data crossing its network.
Reuse rights
Because the terms place ownership of the Customer Data with the customer, that data can be reused, exported and repurposed freely, with no permission to request from Cloudonix. The reverse is narrower: the vendor grants itself a standing right to analyse usage and performance information and to publish it only in aggregated or de-identified form, and it may use each customer's company name and logo to identify it as a client. Personal data collected through the site and the support channels serves service delivery, sales and marketing, product and security notifications, and non-identifying statistics. The privacy policy names its processors: Google Analytics, HubSpot, Gmail, and MailChimp or Mailgun. Nothing on the site describes AI model training on customer data.
Data retention & training
Hosting summary
No hosting country or region is disclosed. The privacy policy states only that personal information is stored on industry-grade servers, where it may be encrypted, with regular security checks, periodic operating system updates, logged access and two-factor authentication in some cases. The compliance page adds a stronger claim on the voice side: Cloudonix does not retain or manipulate the data crossing its network, and keeps only the call information the law requires. An ISO/IEC 27001:2013 certification is claimed. The website itself resolves to a Cloudflare anycast address, which says nothing about where the platform data actually lives. The services listed as in scope in the vulnerability disclosure policy run under api.cloudonix.io, sip and wss subdomains, and cockpit.cloudonix.io. Buyers with a data residency requirement will need to ask directly, since neither a jurisdiction nor a subprocessor location is published.
Things to keep in mind
Risks and trade-offs to weigh before adopting Cloudonix.
- Third-party costs stay with the customer: DID numbers, caller IDs, trunks, termination, origination and SMS are all bought elsewhere
- Monthly and annual payments are non-refundable, and contracts renew automatically unless cancelled thirty days before term
- Overage is charged automatically against the upgrade grid, including 0.50 USD per concurrent channel per day
- A free account is disabled until the following month once 1,000 sessions are reached, and the third simultaneous call is dropped
- Legal and privacy documentation is uneven: a 2019 privacy policy, no DPA, no EU representative and no disclosed hosting country
- The service is stated to be for adults; users between 14 and 18 need explicit parental permission
- Voice agents answering customers unsupervised can mislead callers or mishandle sensitive requests, so human escalation paths deserve as much design attention as the call flow itself
Setup & Integrations
Technical difficulty
Moderate, and deliberately softened. Sign-up is instant with no credit card, connecting an agent to a phone system is announced at under five minutes, and in-app calling at around fifteen. The vendor claims a black-box approach to SIP trunking that hides most of the specialist knowledge, and offers two entry points: CXML or JavaScript for developers, Make for everyone else. A developer portal, a compatibility list, a Discord community, a one-hour training session and a 45-minute pre-sales consultation all cushion the start. The vocabulary, however, remains that of SIP telephony.
Deployment
Integrations
Behind Cloudonix
Social
Resources
All the official URLs gathered for verification and reference.
Frequently asked questions
Do I need a credit card to open a Cloudonix account?
Is there a free trial, and what happens when it ends?
Why does Cloudonix bill per session instead of per minute?
Can I keep my own carrier, numbers and phone system?
What happens if I exceed my package allowance?
Do I have to be a developer to use Cloudonix?
Is Cloudonix itself an AI company?
Which certifications and compliance claims does Cloudonix publish?
Where is the data hosted?
How do I exercise my GDPR rights?
Should you pick Cloudonix?
Cloudonix occupies a narrow and unusually legible position: it is not another builder of conversational agents, but the layer that plugs an existing agent into the real telephone network. That focus shows in the product. Bring-your-own-carrier trunking, a built-in SBC, call-control APIs, CXML and JavaScript container applications, and a Make-based no-code path cover both the developer and the operations side of the same problem, and the one-click links to VAPI, ReTell, Synthflow, Dasha and SuperDash make the intent explicit.
The commercial side is refreshingly plain. Pricing is public down to the overage rates, every paid tier includes every feature, the free plan is permanent rather than a disguised trial, and billing is per session instead of per minute. A domain registered in 2012, a first archived capture in 2016 and a steady run of sector awards from 2023 to 2026 point to a company that has been doing this for a while.
The reservations are concentrated on the legal and documentation side rather than the product. The privacy policy still carries a June 2019 date while the terms were rewritten in August 2025, no DPA or Article 27 representative exists, no hosting jurisdiction is disclosed, and the pricing page contradicts itself in two places. Legal and privacy contacts sit on a neighbouring domain. None of this is disqualifying, but a European buyer with a procurement checklist will have questions to ask before signing.
In short: a credible, well-priced connective layer for teams that already own a voice AI brick and need it to ring an actual telephone.
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