Identity & Comms
AgentPhone
API-driven phone calls for autonomous agents
Overview
About Vapi
This summary uses submitted and public product material. Only source-mapped claims are documentation reviewed.
Vapi is a developer platform for building and operating voice AI agents. The current docs highlight realtime conversations, phone and web integration, squads for multi-assistant handoffs, knowledge bases, call recording, testing, and MCP-based control.
Features
- Realtime voice conversations with natural turn-taking and sub-second response targets
- Phone-number management for inbound and outbound calls plus web voice embedding
- Squad orchestration for multi-assistant handoffs with shared conversation context
- Knowledge bases and custom retrieval backends for grounded answers
- Call recording, analysis, concurrency controls, voice testing, and MCP server support
So agents can…
- Run phone-based support, qualification, scheduling, and routing workflows
- Hand conversations between specialized voice agents without losing context
- Blend telephony, retrieval, and backend tool calls into one production voice stack
Listing decision
Why Vapi is listed
Vapi provides the realtime speech, model, tool, handoff, telephony, and conversation orchestration needed to run autonomous voice assistants, so the platform is agent-native rather than only a communications transport.
Before you choose
Fit and limitations
Best for
Developers building inbound or outbound voice agents for support, qualification, booking, routing, campaigns, or browser-based voice experiences that need configurable providers, tools, knowledge, handoffs, and observability.
Known limitations
Costs combine Vapi hosting with telephony and speech/model/voice provider charges; Build has finite included concurrency and default retention windows, while some compliance and zero-retention features are paid add-ons. Operators remain responsible for testing, prompt/tool safety, consent, calling rules, recording notices, and jurisdiction-specific telephony compliance.
Not yet verified
Sub-600 ms latency and platform reliability or compliance claims in first-party materials were not independently verified. Actual quality, latency, cost, availability, and data handling also vary with selected providers, regions, phone carriers, prompts, and tools.
Sources
Sources and verification
First-party unless marked otherwise. Each link supports only its adjacent claim.
- Vapi introduction — hosted voice-agent platform
Vapi documents a hosted developer platform for voice agents that combines speech recognition, a configurable language model, speech synthesis, phone and web channels, tool integrations, and multi-assistant squads.
official documentation · accessed Sep 3, 2026 - Vapi assistants quickstart — inbound and outbound phone calls
The official quickstart shows assistant creation through the dashboard or API, web-call testing, phone-number attachment, and inbound, outbound, and scheduled phone calls.
official documentation · accessed Sep 3, 2026 - Vapi MCP server — agent management interface
Vapi publishes a hosted MCP server for managing platform objects such as assistants, calls, tools, files, squads, and phone numbers from compatible clients.
official documentation · accessed Sep 3, 2026 - Vapi pricing — usage, provider costs, concurrency, and retention
The official pricing page lists usage-based Build pricing, pass-through speech/model/voice provider costs, included and paid concurrency, default call and chat retention periods, optional compliance add-ons, and custom annual Scale terms.
official pricing · accessed Sep 3, 2026 - Vapi terms — service operator
The official terms identify Vapi Inc. as the Delaware corporation operating the voice-agent deployment service.
official legal · accessed Sep 3, 2026
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