Use case
AI Voice Agent
A production-grade AI voice agent that runs real phone calls — inbound, outbound, and warm transfers — using your tools live, in your brand voice.
- Average reply latency
- <200ms
- Languages
- 100+
- Concurrent calls
- 500+
- Refund guarantee
- $2M
01 — Overview
What is an AI voice agent and what makes Open different?
An AI voice agent is software that has a real conversation over the phone — not a recorded prompt, not an IVR, but actual back-and-forth speech that calls your tools and decides what to do next. Open is built specifically to plug into the phone systems and CRMs businesses already run.
The market for AI voice agents has exploded over the last 18 months. The infrastructure side (Bland, Vapi, Retell, Synthflow) and the vertical side (PolyAI, ElevenLabs Conversational AI) all do impressive things. What they have in common: you build with them. You stitch the SIP, the LLM, the memory, the tooling, the analytics, the compliance, and the human-handoff. They are platforms, not products.
Open is a product. It ships with the SIP layer (so it joins your existing carrier — Twilio, Vonage, RingCentral, Zoom Phone, your trunk — without you wiring it), with the tool integrations (Salesforce, HubSpot, Zendesk, Stripe, Calendar, Shopify, ~50 more), with the analytics, with the warm transfers, with the recording and PII redaction, with SOC 2 / HIPAA / PCI compliance. You configure the agent's role and the tools you grant it; you don't build the platform that runs it.
What that means in practice: most customers are running their first AI voice agent in production within a day. They keep their numbers, their CRM, their helpdesk, their reporting. They opt in queues, IVR branches, or specific numbers to AI handling and leave the rest of their phone system alone.
On the call itself, the AI agent listens, reasons over your knowledge base and connected tools, and acts. It looks up an order in Shopify, books a slot in Calendar, sends a payment link via Stripe, creates a Zendesk ticket, fills custom fields in Salesforce, warm-transfers via SIP REFER with the transcript attached. Latency stays under 200ms median because the SIP/RTP path is direct — there is no extra hop between your carrier and the AI.
Pricing is per resolved conversation. Carrier minutes continue to be invoiced by your phone provider with no markup from Open. Volume discounts kick in early.
What stays the same
Your phone system
Carrier (Twilio, Vonage, RingCentral, Zoom Phone, BT, Verizon, Orange, anyone with SIP) stays where it is.
Your CRM, helpdesk, calendar, billing
Open uses your existing tools via official APIs — never a rip-and-replace.
Your numbers and IVR
Numbers don't port. IVR branches and queues you don't opt in keep working unchanged.
Your reporting
Carrier-side call logs continue. Open adds AI-side reasoning traces and outcome tags on top.
What's new with Open
AI is a SIP destination on your trunk
Open's SIP endpoint joins as a routing target on the queues, branches, or numbers you opt in.
AI handles full conversations
Greets, listens, calls your tools, replies in natural speech, warm-transfers when needed.
Transfers carry context
Live transcript and detected intent attached on SIP REFER back to your team.
Pricing model
Per resolved conversation, not per agent or per minute. Carrier minutes stay billed by your provider.
02 — Why it works
What makes Open the right use case answer
Production-ready, not a build-your-own kit
SIP, tooling, analytics, compliance, transfers — all included. You configure, not assemble.
Plugs into your existing stack
Carrier, CRM, helpdesk, calendar, billing — Open uses what you already run via official APIs.
Sub-200ms latency on the call
No proxy between your carrier and the AI. The SIP/RTP path is direct, so the conversation feels human.
Multilingual without an upcharge
100+ languages out of the box, with mid-call language switching when the caller does.
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
AI Voice Agent questions, answered
More voice AI guides