Hi, I an trying to SIP Trunk it with META, I am getting call logs but, later running into an error An error occurred in this call: call.in-progress.error-vapifault-transport-never-connected

Hi Abhilash, The error "call.in-progress.error-vapifault-transport-never-connected" typically indicates that the connection between Vapi and your SIP provider's network is not successfully established. Here are some steps to troubleshoot this issue: 1. **Verify Credentials**: Ensure that the SIP trunk credentials (username/password and gateway address) are correctly configured in Vapi. 2. **Whitelist IPs**: Make sure that the IP addresses

44.229.228.186/32

,

44.238.177.138/32

, and

172.31.9.106/32

are allowlisted in your SIP provider's network settings, as these are used exclusively for SIP traffic. 3. **SIP Provider Setup**: Confirm with your SIP provider that they have the correct configurations and are not blocking the connection or any protocols required by Vapi. 4. **Test Configurations**: Review and cross-check your connection settings with those mentioned in the [SIP Trunking Guide](https://docs.vapi.ai/advanced/sip/sip-trunk) to ensure all steps are accurately followed. 5. **Network Requirements**: Check if there are any network restrictions, such as firewalls or NATs, that could be interfering with the SIP traffic. Implement these suggestions to ensure your SIP trunk is correctly configured. This should help resolve connectivity issues and establish a stable connection for your calls.