Can I Apply Signals or Marketing Data to Multiple Calls Using the Signal API?

Not in a single request — the Signal API applies data to one call at a time, though you can send up to 100 requests per minute.

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How the Signal API applies data

1. Call reference — the Call Record ID, Transaction ID, or Call Start Time that identifies the call.
2. Signals or Marketing Data — the data to apply.
3. OAuth token — required for authentication.

POST /signal HTTP/1.1
Authorization: Bearer <oauth_token>
Content-Type: application/json

{
  "call_record_id": "<call_record_id>",
  "signals": ["<signal_name>"],
  "marketing_data": {
    "<field_name>": "<value>"
  }
}

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Things to keep in mind

• One call per request — applying data to multiple calls in a single request isn’t supported. Send a separate request for each call.
• Rate limit — up to 100 requests per minute.
• Backlog risk — sending the maximum number of requests in a short window can create a processing backlog and delay when data is applied.

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Where to go next

• Can I Modify a Call Record Before the Call Ends?
• “Call Must Be Present” Error on the Signal API