Webhook does not return asistentId on inbound call...
# supportf
fatihyilmaz
04/11/2025, 10:36 PMFor ex: $('Webhook1').item.json.body.message.assistant?.id
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Vapi Support Bot
04/11/2025, 10:38 PMHi there! 👋
I understand you're experiencing an issue where the assistantId is sometimes null in the webhook response for inbound calls. While I can't determine the exact cause in your specific case without more details, I can definitely help explain why this might be happening and provide some troubleshooting steps.
Here are several potential reasons why the assistantId might be returning null in your webhook responses:
1. **Phone Number Configuration Issues**: The assistantId might not be correctly set on your phone number. It's necessary to assign an assistant to your phone number to use Voice AI with that number. [According to Vapi documentation](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1336652401733668864), this is a common cause.
2. **Server URL Retrieval Failure**: If a phone number doesn't have an assistantId configured, Vapi will attempt to retrieve it from your server. If this retrieval fails, you'll get a null assistantId. [As mentioned in the Vapi docs](https://docs.vapi.ai/phone-calling), this is part of the expected behavior when the retrieval fails.
3. **Assistant Request Problems**: There might be an issue with the assistant request itself, preventing the assistantId from being properly included in the response.
4. **Incorrect API Key Usage**: Using the wrong API key can prevent the Knowledge Base from being invoked, potentially leading to the assistant not being properly configured or identified.
5. **Webhook Configuration Issues**: Ensure your webhook is correctly configured to receive and process the responses from Vapi.
6. **Persistent Assistant Usage**: If you're not using a persistent assistant (through the dashboard), you might not get the assistant ID in the response. [According to Vapi documentation](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1336915389040558160), when you use a persistent assistant, you will get the assistant ID; otherwise, you will not.
Vapi Support Bot
04/11/2025, 10:38 PMFor troubleshooting, I recommend:
1. **Verify Assistant Configuration**: Ensure the assistant ID is correctly set on your phone number and properly configured in Vapi.
2. **Check Server URL Settings**: If you're using a server URL to retrieve the assistant, make sure it's correctly configured and accessible.
3. **Review Webhook Configuration**: Verify that your webhook URL is correctly set up and can receive POST requests from Vapi.
4. **Test the Endpoint**: Try sending a manual POST request to your webhook URL using a tool like Postman or cURL to ensure it's working as expected.
5. **Check for Conflicting Properties**: If your payload includes both an
assistantIdassistantassistantassistantk
Kyle Brunker
04/14/2025, 12:27 PMHey, could you share the call ID and the webhook type so I could take a look?