{ "from_phone": "one of your agent's phone number", "to_phone": "receiver's phone number", "metadata": { key: value }, // Optional: any extra data to attach to the session include_metadata_in_prompt: true/false // Optional: option to include the metadata in the agent's system prompt}
Ensure the phone number includes the full international dialing format (e.g., +15555555555), with no dashes or spaces. (Only US phone nubers are supported)Retrieve your voice agent ID from the Agent Details page on the playground.