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The API Trigger node lets you initiate outbound calls to your voice agent programmatically. When you add an API Trigger node to your workflow, Asisso generates a unique endpoint URL that external systems can call to start a conversation. This is useful when you want to trigger calls from your own backend, a CRM, or workflow tools like n8n and Zapier.

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Prerequisites

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Finding your trigger URL

When you add an API Trigger node to your workflow, Asisso assigns it a unique UUID. The trigger node exposes two URLs that share this UUID — one for the published agent and one for the latest draft. You can copy either URL from the trigger node’s settings dialog. 
POST https://your-asisso-instance/api/v1/public/agent/{uuid}        # Production
POST https://your-asisso-instance/api/v1/public/agent/test/{uuid}   # Test
If you are using the hosted version, replace your-asisso-instance with api.asisso.com.

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Test vs production

ModeURLRuns
Production/api/v1/public/agent/{uuid}The published version of the agent.
Test/api/v1/public/agent/test/{uuid}The latest draft. Falls back to the published version if no draft exists.
Use the test URL while iterating on changes so production traffic continues to hit the published version. Once you publish your draft, both URLs run the same definition. The request body, headers, and response shape are identical for both URLs.

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Making a request

Authenticate by passing your API key in the X-API-Key header. The request body requires a phone_number and accepts optional initial_context and telephony_configuration_id fields. 
curl -X POST https://your-asisso-instance/api/v1/public/agent/{uuid} \
  -H "Content-Type: application/json" \
  -H "X-API-Key: dg_your_api_key" \
  -d '{
    "phone_number": "+14155550100",
    "initial_context": {
      "customer_name": "Jane",
      "appointment_date": "March 15"
    }
  }'

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Response

A successful request returns a workflow_run_id that you can use to retrieve call details, recordings, and transcripts. 
{
  "status": "initiated",
  "workflow_run_id": 12345,
  "workflow_run_name": "WR-API-7823"
}

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Error responses

StatusCause
400Telephony provider not configured, or call failed to initiate
401Missing or invalid API key
403API key does not have access to this agent
404Trigger not found or not active

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Initial context

initial_context is a JSON object containing any information you want your voice agent to access during the call. You can reference these values in your prompts using template variables — values enclosed in {{ and }}. For example, if your request includes: 
{
    "phone_number": "+14155550100",
    "initial_context": {
        "user": {
            "name": "John"
        }
    }
}
You can reference the user’s name in your prompt as {{initial_context.user.name}}. See Context & Variables for more on how data flows through a call.

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Choosing a telephony configuration

By default, calls are placed through your organization’s default outbound telephony configuration. To route a specific call through a different configuration — for example, to dial out from a regional number — pass telephony_configuration_id in the request body. 
{
  "phone_number": "+14155550100",
  "telephony_configuration_id": 42
}
The id is shown on each row in Telephony configurations at app.asisso.com/telephony-configurations. The configuration must belong to the same organization as the API Trigger; otherwise the request returns 404.
For full endpoint details including all parameters and response fields, see the API reference.