Hi there! 👋 I understand you're having an issue where your Vapi assistant stops responding after the first message when using a Telnyx number. While I can't pinpoint the exact cause without seeing your specific configuration, I can definitely help with some common issues and troubleshooting steps for this problem. Here are several potential causes and solutions to check: ### 1. Assistant Configuration Issues Your assistant might only be configured to speak the first message. Check your assistant configuration to ensure both

firstMessage

and

firstMessageMode

are properly set:

javascript
const assistant = {
  // ... other configurations ...
  firstMessage: "Hello! I'm your AI assistant. How may I help you today?",
  firstMessageMode: "assistant-speaks-first"
};

### 2. SIP Trunking Configuration Make sure your Telnyx SIP trunk is correctly configured with Vapi: - Verify the gateway IP (

sip.telnyx.com

), FQDN (

sip.vapi.ai

), and Port (

5060

) settings - Check that your SIP URI is correctly formatted in the Vapi configuration - Ensure authentication credentials are correct if your SIP endpoint requires authentication According to the [Vapi Telnyx documentation](https://docs.vapi.ai/advanced/sip/telnyx), you need to properly set up both inbound and outbound configurations. ### 3. Webhook and Event Handling Ensure that webhook URLs and event settings are pointing to the right endpoints and are set up to handle events correctly. Verify that your event handling logic is correctly interpreting the events sent by Telnyx. ### 4. Turn-Taking Behavior The assistant might be working as intended if it's designed to wait for user input after the first message as part of its turn-taking behavior. ### 5. Start Speaking Plan Configuration Try modifying the

start_speaking_plan

and

transcriber

configurations: ```json "start_speaking_plan": { "waitSeconds": 0.8, "smartEndpointingEnabled": true }, "transcriber": { "model": "nova-2", "language": "en",

@Vapi Support Bot What should I put in the webhook URL and webhook Failover URL?

For your Telnyx and Vapi integration, here's what you should configure for the webhook URLs: ### Webhook URL The webhook URL should point to an endpoint on your server that can receive POST requests from Vapi. This is where Vapi will send real-time conversation data and events. If you're using Vapi's API to configure this, you would set it like this:

curl --location --request PATCH 'https://api.vapi.ai/phone-number/your_phone_id' \
--header 'Content-Type: application/json' \
--header 'Authorization: Bearer your-vapi-private-api-key' \
--data '{
"assistantId": null,
"serverUrl": "https://your_server_url"
}'

Replace

https://your_server_url

with the actual URL of your webhook endpoint that can handle the assistant requests. ### Webhook Failover URL Unfortunately, I don't have specific information about what to put in the "webhook Failover URL" field for Telnyx and Vapi integration. This appears to be a Telnyx-specific setting that might serve as a backup webhook endpoint if the primary one fails. Would you be able to share a screenshot of where you're seeing this field? This would help me provide more specific guidance for your configuration. Source: - [Vapi Telnyx documentation](https://docs.vapi.ai/advanced/sip/telnyx)

Hey! To help track down this issue, could you share: - The call ID This would really help us figure out what went wrong!

f250844e-83db-46b8-888f-9203d973f30d

Please provide details of your issue and steps taken to resolve it. This will help me understand your challenges and tailor suggestions. I can propose new solutions or enhance existing approaches.