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Function calls not working
# support
t
sometimes the assistant is not making the function call at all.
v
Hi there! 👋 I understand you're having issues with function calls not working in Vapi, where sometimes the assistant isn't making the function call at all. While I don't have specific details about your particular setup, I can definitely help with general troubleshooting steps and known issues that might be causing this problem. ## Possible Reasons Why Function Calls Might Fail There are several reasons why function calls might not be working in Vapi: 1. **Configuration Issues**: Make sure that 
endCallFunctionEnabled
is set to true in the dashboard. This is a common issue that prevents function calls from working properly. [(Source)](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1313293840580612166) 2. **Webhook and Endpoint Issues**: Double-check your webhook URL to ensure it matches exactly with the one you're trying to use. Even small typos can cause function calls to fail. [(Source)](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1336345690393149452) 3. **Network and Connectivity Problems**: Ensure there are no connectivity issues between Vapi and your server. Network restrictions like firewalls can cause connection failures. [(Source)](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1329235631855108128) 4. **Incorrect Parameters or Data Format**: The function might not be receiving the correct parameters to execute properly. Make sure all required parameters are being passed correctly. [(Source)](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1336345690393149452) 5. **Potential Bugs in Vapi**: Sometimes the issue might be on Vapi's side. There have been reports of inconsistent webhook calls despite stable setups. [(Source)](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1334280135683084328) ## Troubleshooting Steps Here are some steps you can take to troubleshoot the issue:
1. **Review Logs**: Check the logs in Vapi for any error messages that might indicate what's going wrong. [(Source)](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1336345690393149452) 2. **Test the Webhook Manually**: Try triggering your webhook manually using a tool like Postman or cURL to verify it's operational. [(Source)](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1336345690393149452) 3. **Verify Server URL**: Ensure that the server URL entered in the Vapi Dashboard is correct and accessible from outside your network. [(Source)](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1326809606671958080) 4. **Check for Concurrency Limits**: Determine if you're hitting "over concurrency limit" errors, which could prevent function calls from executing. [(Source)](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1334159219649417289) 5. **Review Recent Changes**: If this worked before, review any recent changes made to your Vapi configuration or code that might have affected the assistant's behavior. [(Source)](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1334114042876264518) ## Known Issues There are some known issues with function calls in Vapi: 1. **Assistant Tool Calls Without Feedback**: Some users have reported that the assistant makes tool calls but doesn't provide feedback afterward. [(Source)](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1334114042876264518) 2. **Vapi Failing to Make Requests**: There have been reports of Vapi failing to make requests to servers for assistant details. [(Source)](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1339740286922002523)
3. **Issues with LLM Native Tools**: If using LLM native tools, the function calls might not work as expected because you need to return the generated message content. [(Source)](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1335181348285054996) 4. **Vapi Blocks Compatibility**: Vapi blocks doesn't work with the server SDK. [(Source)](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1336762229110083675) Is there any specific error message you're seeing or could you provide more details about your setup so I can help you troubleshoot more effectively? Sources: - [Discord Thread about endCallFunctionEnabled](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1313293840580612166) - [Discord Thread about webhook URL issues](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1336345690393149452) - [Discord Thread about network connectivity](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1329235631855108128) - [Discord Thread about concurrency limits](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1334159219649417289) - [Discord Thread about assistant tool calls](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1334114042876264518) - [Discord Thread about Vapi failing to make requests](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1339740286922002523) - [Discord Thread about LLM native tools](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1335181348285054996) - [Discord Thread about Vapi blocks compatibility](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1336762229110083675)
t
Around 50% of the time our functions are not being called for a particular call. Interestingly, you also won't see transcription console messages at the same time when this issue occurs. Here's an errant call ID: d3b70f75-cd14-4ef8-8526-ab75a920faaa
k
Hey! To help track down this issue, could you share: - 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!
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