Hello, how are you? My name is Pablo, and I represent MB Finance, a financial services company based in Brazil. We are using VAPI for remarketing with our leads, and I would like some assistance regarding Voicemail. I’d like to understand: what is the best Voicemail Detection option for calls within Brazil? All our calls are made exclusively to Brazilian numbers. Additionally, I’d like to know how I can configure voicemail detection through the API, as we are initiating calls via API / n8n. If voicemail is detected, we would like the call to be immediately disconnected, as this helps reduce costs. Can you help me with that?

According to [VAPI documentation](https://docs.vapi.ai/phone-calling/voice-mail-detection), there are two main voicemail detection options available: 1. Twilio's built-in detection 2. VAPI's LLM-powered voicemail tool Both can be configured to automatically disconnect calls when voicemail is detected. Before I provide specific configuration instructions for your n8n integration, could you share which voicemail detection method you're currently using (if any), and what specific challenges you've encountered with voicemail detection for Brazilian numbers? Source: - [VAPI Voice Mail Detection](https://docs.vapi.ai/phone-calling/voice-mail-detection)

I haven’t configured any voicemail detection yet because I’m using a Brazilian telephony service connected via SIP Trunk. However, the JSON payload I’m currently using to initiate the calls is as follows: { "assistantId": "ae7c1de0-ce61-4ac5-b686-58ed9673e0d1", "customer": { "number": "46751255{{ $('Google Sheets').item.json.telefone }}", "numberE164CheckEnabled": false }, "phoneNumberId": "65a11ca0-eb80-4bab-ab06-cdb777f45bc5", "assistantOverrides": { "variableValues": { "nome": "{{ $('Google Sheets').item.json.nome }}", "fone1": "{{ $('Google Sheets').item.json.telefone }}", "cnpj": "{{ $('Google Sheets').item.json.cnpj }}", "cnpjota": "{{ $json.message.content }}", "rownumber": "{{ $('Google Sheets').item.json.row_number }}", "e-mail": "{{ $('Google Sheets').item.json.email }}" } } }

Hi Pablo, great to hear from you. For the best voicemail detection in Brazil, I recommend using Vapi's built-in tool combined with Vapi's voicemail detection. This combo enhances accuracy by allowing both systems to detect voicemail, ensuring more reliable results. To configure this, I will suggest checking out this documentation . You'll get all the details in brief here. If you run into any issues or need more help setting it up, feel free to reach out.