Darwin AI

HTTP Method: <code>POST</code> URL: <code>[https://voice-gateway-service-production.up.railway.app/api/v1/calls](https://voice-gateway-service-production.up.railway.app/api/v1/calls)</code>

Pass the following parameters in the JSON body of your request:

Example 1: Standard Outbound Call with Custom Prompt Variables

This example demonstrates how to initiate a call while injecting dynamic variables into both the mission prompt and a customized first message.

curl --location 'https://voice-gateway-service-production.up.railway.app/api/v1/calls' \ --header 'Content-Type: application/json' \ --header 'X-API-KEY: &lt;YOUR_API_KEY&gt;' \ --data '{ "channel_id": 123, "from_phone_number": "+549341567894", "to_phone_number": "+5493415678937", "customer_name": "John Doe", "initial_pipeline_id": "345", "prompt_templates": { "consignatario": "onboarding" }, "first_message": "Hello, how are you?", "variable_values": { "name": "John Doe" } }'

The Outbound Call API allows you to programmatically initiate automated outbound voice calls. Through this endpoint, you can dynamically assign pipelines, override the default opening message, and inject variable data directly into your agent's prompts

Calls - Darwin Endpoint for Outbound

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Header	Value	Description
Content-Type	`application/json`	Specifies the payload format.
X-API-KEY	`string`	The API Key associated with your Organizational Unit (OU).

Parameter	Type	Description
`channel_id`	Integer	The unique identifier for the calling channel. This can be found in Retool.
`from_phone_number`	String	The phone number of the channel originating the call.
`to_phone_number`	String	The destination phone number of the client.
`customer_name`	String	The name of the client receiving the call.
`initial_pipeline_id`	String	Optional. Overrides the predetermined pipeline. Add the specific pipeline ID you wish to use.
`prompt_templates`	Object	Optional. Matches `{{variable_name}}` tags within the mission to their dynamic values.
`first_message`	String	Optional. Overrides the default opening message configured in the pipeline.
`variable_values`	Object	Optional. Matches `{{variable_name}}` tags specifically used within your custom `first_message`.

Calls - Darwin Endpoint for Outbound

Endpoint Details

Headers

Request Payload Parameters

Code Examples

Example 1: Standard Outbound Call with Custom Prompt Variables