!!!URGENT HELP NEEDED! vapi function calls are not...
# support
d
Function calls are not happening 9/10 times. Sometimes it does hit but most of the time it doesn’t.
v
Hi there! I understand you're experiencing urgent issues with Vapi function calls not executing consistently - that's definitely frustrating! 🔍 I'd be happy to help troubleshoot this high failure rate you're experiencing with your Vapi function calls. Let me share some common causes and troubleshooting steps that might help resolve this issue. ## Common Causes for Vapi Function Call Failures Several factors could be causing your function calls to fail 9 out of 10 times: 1. **Configuration Issues**: - Incorrect webhook URLs or server URLs in your Vapi dashboard - Misconfigured endpoints that aren't set up to receive POST requests - API credentials or permissions issues 2. **Network and Connection Problems**: - Connectivity issues between Vapi and your external services - Network restrictions like firewalls blocking connections - Timeout errors when reaching Vapi servers 3. **Code and Logic Issues**: - Bugs in the function implementation - Incorrect parameters being passed to functions - Execution order problems with variables not being set before they're used - Data format mismatches between what's sent and what's expected 4. **System Limitations**: - Exceeding concurrency limits for your organization - High call volumes affecting response times - Intermittent issues with the Vapi service or processing pipeline ## Troubleshooting Steps Here are some steps you can take to diagnose and fix the issue: ### 1. Check Your Logs According to the information I found, checking logs is crucial for diagnosing function call issues: - Check server logs for detailed error messages - Review Vapi dashboard logs for any error patterns - If using webhooks, access webhook delivery logs through the Vapi dashboard ### 2. Verify Configuration - Double-check your server URL in the Vapi Dashboard is correct and accessible - Verify your endpoint is properly configured to receive POST requests
- Review any recent changes that might have affected functionality ### 3. Test Your Endpoints - Manually test your endpoints using tools like Postman or cURL - Use
wscat
to test WebSocket connections if you're using WebSockets:
Copy code
sh
  wscat -c wss://aws-us-west-2-production1-phone-call-websocket.vapi.ai/<call-id>/transport
### 4. Implement Better Error Handling Enhance your error handling to capture more detailed information:
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javascript
// Example for WebSocket connections
const handleError = (ws, source) => {
  ws.on('error', (error) => {
    console.error(`${source} WebSocket error:`, error);
  });
  ws.on('close', (code, reason) => {
    console.log(`${source} WebSocket closed:`, code, reason.toString());
  });
};
### 5. Check for Specific Errors Look for these common error patterns: - 524 error codes (indicating timeouts) - "Over concurrency limit" errors - 491 Request Pending errors (especially with SIP transfers) - JSON formatting issues in responses If you're still experiencing issues after trying these steps, could you share more specific details about your implementation and any error messages you're seeing? Sources: - [Troubleshooting Vapi function calls not executing](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1336456720913797238) - [Common problems with Vapi function calls not executing](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1336345690393149452) - [Debugging techniques for Vapi function calls](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1329235631855108128) - [Vapi function call error handling and logging](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1341810370700120064) - [Reasons for high failure rate of Vapi function calls](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1334159219649417289)
k
Hey! To help track down this issue, could you share: - The call ID - When exactly this happened (the timestamp) - What response you expected to get - What response you actually got instead This would really help us figure out what went wrong!