----------------------------- **While I generate an answer, here are some sources that might be helpful**: * [Outbound Sales Example]() * [Outbound Calls from Python]() * [Outbound Calling]() * [List Calls]() -----------------------------

### Answer To investigate the issue of outbound calls being silent, consider these steps: 1. **Check Transcriber and Model**: Ensure your transcriber and model configurations are correctly set. Verify that the transcriber and model provider API keys are still valid and active. An expired API key can cause unknown errors and silent responses [(1)]() . 2. **Review Call Logs**: Use the

List Calls

API to retrieve the logs and details of the call. This can help understand if there were any errors or issues during the call setup [(2)]() . 3. **Deepgram API Key**: Ensure that the Deepgram API key (if used) is not expired. An expired key can lead to silent calls as mentioned in a similar issue [(1)]() . 4. **Silent Messages**: If you need to send silent messages to control the assistant's behavior during a call, you might need to implement custom handling by running your own custom LLM server [(3)]() . Here is an example of how to list call details using the Vapi API:

python
import requests

# Your Vapi API Authorization token
auth_token = '<YOUR AUTH TOKEN>'

# Create the header with Authorization token
headers = {
    'Authorization': f'Bearer {auth_token}',
    'Content-Type': 'application/json',
}

# Make the GET request to Vapi to list the calls
response = requests.get(
    'https://api.vapi.ai/call', headers=headers)

# Check if the request was successful and print the response
if response.status_code == 200:
    print('Call details retrieved successfully')
    print(response.json())
else:
    print('Failed to retrieve call details')
    print(response.text)

[(2)]() This should help diagnose if there are any specific errors during your calls.