Is Open a platform or a product?

Both. It ships as a product (you configure agents, not infrastructure), but every part of it is exposed via API so you can manage it programmatically.

How does it compare to Bland, Vapi, Retell, Synthflow?

Those are infrastructure platforms — you build the agent on top. Open is the agent itself, plus the tooling around it. We have detailed comparison pages for each.

Can I run multiple agents on different numbers / queues?

Yes — unlimited agents, each with their own role, knowledge scope, voice, languages, and tool permissions.

How do I roll out prompt or knowledge changes safely?

Versioned agents, A/B routing, shadow-mode testing, rollback. You can run a new agent on 10% of traffic before promoting it.

What about offline / hybrid deployments?

Open is cloud-first but supports a self-managed deployment for regulated industries on request. Talk to sales for the deployment model that fits.

How is the platform priced?

Per resolved conversation, not per seat or per agent. Volume discounts apply. There's no separate platform fee.

Is there a free trial?

Yes — sign up, connect a number, run test calls. Production traffic starts when you flip a routing rule.

Platform

Voice AI Platform

A voice AI platform with the SIP, the tooling, the analytics, and the compliance already wired. Configure the agent — not the plumbing.

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Carrier integrations: 37+
Tool integrations: ~50
Median latency: <200ms
Type II audited: SOC 2

01 — Overview

What does a voice AI platform need to do for production traffic?

Six things: handle real SIP, call your business tools, hold a real-time conversation under 200ms, log every call with reasoning traces, transfer to humans cleanly, and pass compliance audits. Open is built so you don't have to assemble those six layers yourself.

There are two camps in voice AI. One is the build-your-own infrastructure camp (Bland, Vapi, Retell, Synthflow, Pipecat, LiveKit Agents). They give you the LLM, the TTS/STT, sometimes a SIP gateway, and a small SDK. You assemble the rest — carrier integration, tool calling, prompt management, memory, transcripts, recording, redaction, observability, compliance, transfer logic. That's a real engineering project, often a multi-quarter one, and you own the operational risk forever.

The other camp is the product camp. Open ships with the SIP layer integrated against 37+ carriers (so you join your existing Twilio / Vonage / RingCentral / Zoom Phone / Avaya / Mitel / BT / etc. without engineering), with ~50 tool integrations (Salesforce, HubSpot, Zendesk, Stripe, Calendar, Shopify, Slack, Jira), with full observability (recording, transcript, reasoning trace, outcome tag, cost-per-call), with warm transfers via SIP REFER, with PII redaction, and with SOC 2 Type II / GDPR / HIPAA / PCI compliance.

What that means in practice: the question "can our team build and operate this in-house?" becomes "do we want to?". The infrastructure work itself isn't impossible — it's just six different specialties (SIP networking, real-time audio, LLM ops, integrations engineering, security/compliance, supervisor tooling). Open lets you skip that build and focus on the part that's actually unique to your business: what the agent does on a call.

On the platform side, Open exposes everything via API: agents, tools, knowledge, calls, transcripts, transfers, webhook events. You can manage agents through the dashboard or programmatically; you can plug Open into your existing CI for prompt rollouts; you can stream transcripts in real time to a webhook. The platform doesn't lock you in — every integration is an open standard or an official partner API.

Pricing is per resolved conversation, with no per-seat, per-agent, or per-environment fees. Volume discounts kick in early. Carrier minutes continue to be invoiced by your phone provider with no markup.

What you bring

Your carrier
37+ carriers supported as SIP destinations. Twilio, Vonage, RingCentral, Zoom Phone, Avaya, BT, Verizon, Orange, etc.
Your business tools
CRM, helpdesk, calendar, billing — Open uses your existing systems via official APIs, never replaces them.
Your knowledge
Connect Notion, Confluence, Drive, your help center — Open trains and updates the agent's memory continuously.
Your brand and voice
Voice cloning via ElevenLabs or custom voices, brand-specific scripts, multilingual fallback rules.

What Open ships with

SIP / RTP plumbing
Multi-region SIP endpoints, TLS/SRTP encryption, codec negotiation — handled, not built.
Tool calling and memory
Native tool integrations, structured memory, retrieval — wired in, not stitched.
Observability and compliance
Recording, transcript, reasoning trace, PII redaction, SOC 2 / HIPAA / PCI — included, not bolted on.
Warm human handoff
SIP REFER and PSTN bridge with transcript attached — production-grade, not POC-grade.

02 — Why it works

What makes Open the right platform answer

Six layers, one product
SIP, tooling, real-time, observability, compliance, transfers — all in. No assembly.
Carrier-agnostic
37+ carrier integrations as first-class SIP destinations. Bring whichever phone provider you already run.
API-first
Everything in the dashboard is also in the API. CI-friendly, automatable, observable end-to-end.
Compliance done
SOC 2 Type II, GDPR-aligned, HIPAA- and PCI-ready. PII redaction on transcripts. Backed by a $2M refund guarantee.

03 — Security

Encrypted, audited, refundable

SIP over TLS for signaling, SRTP for media. Every call logged with full reasoning traces. SOC 2 Type II, GDPR-aligned, HIPAA- and PCI-ready. Backed by the Open $2M Refund Guarantee.

04 — FAQ