AsyncAPI channel · Vapi · Vapi Realtime API (WebSocket Transport + Server URL Events)

server-url/voice-request

TTS audio request sent to a custom voice server configured via `assistant.voice.server.url`. The customer endpoint must respond with raw 1-channel 16-bit PCM audio at the requested `sampleRate` (binary, not JSON).

Open source AsyncAPI → All Vapi channels Vapi provider profile
Provider: Vapi AsyncAPI: v2.6.0 Spec: Vapi Realtime API (WebSocket Transport + Server URL Events) Operations: 1 Messages: 1

Channel address

server-url/voice-request

Operations

subscribe server-url/voice-request

Messages

VoiceRequest
voice-request
Content-Type:

About AsyncAPI

The AsyncAPI specification describes event-driven APIs the way OpenAPI describes request/response APIs. A channel is the named pipe — a webhook URL, a Kafka topic, a WebSocket route, an MQTT subject — that producers and consumers publish or subscribe to. Each channel carries one or more messages with structured payloads, and an operation declares whether a given party sends or receives on that channel.

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