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Voice Agent

Make and receive AI-powered phone calls

Initiate outbound calls, handle incoming calls, and run AI-driven voice conversations using Twilio with configurable TTS voices.

Toolsvoice_agent

Usage

01Add the block to your workflow and connect it to the upstream step.
02Configure any required credentials or tokens in the inputs.
03Fill in required inputs and optional parameters for the run.
04Run a test execution, inspect outputs, and iterate before deploying.
05Deploy the voice_agent block with monitoring enabled in production.

Inputs (UI)

Action

dropdown

Layout: full

Options: make_call, receive_calls, configure_voice

Phone Number

short-input

Placeholder: +1234567890

Layout: full

Condition: action = "make_call"

Account SID

short-input

Placeholder: Twilio Account SID

Layout: half

Auth Token

short-input

Placeholder: Twilio Auth Token

Layout: half

From Number

short-input

Placeholder: Your Twilio phone number

Layout: full

Voice Provider

dropdown

Layout: half

Options: openai, elevenlabs, google, deepgram

Voice ID

short-input

Placeholder: Provider-specific voice ID

Layout: half

Greeting Message

long-input

Placeholder: Hello, how can I help you today?

Layout: full

AI Model

dropdown

Layout: half

Options: gpt-4o, gpt-4o-mini, claude-sonnet-4-20250514, gemini-2.0-flash

Webhook URL

short-input

Placeholder: https://your-domain.com/api/voice/webhook

Layout: full

Condition: action = "receive_calls"

Inputs (API)

action

string

Required

Action: make_call, receive_calls, or configure_voice

phoneNumber

string

Optional

Destination phone number for outbound calls

accountSid

string

Required

authToken

string

Required

fromNumber

string

Required

voiceProvider

string

Optional

TTS provider for voice responses

voiceId

string

Optional

Voice ID for TTS provider

greetingMessage

string

Optional

Initial greeting when the call connects

aiModel

string

Optional

AI model for generating responses

webhookUrl

string

Optional

Webhook URL for call events and TwiML

Outputs

Primary response type:

{
  "success": "boolean",
  "callSid": "string",
  "status": "string",
  "error": "string"
}

Tool Access

twilio_voice_call