Hello #1211483291191083018 I am from Frejun India, we provide services like SIP Trunking to our clients. Many of our clients are interested in VAPI integration, I went through the documentation but, I guess there is an issue in initiating calls. Could you guys give me a step by step approach it would work for us. Every time I initiate outbound calls, there are some errors. Thank you.

Thanks for reaching out about your SIP Trunking setup! You can find step-by-step troubleshooting help here: 👉 [Vapi SIP Trunking Guide](https://docs.vapi.ai/advanced/sip/sip-trunk) If that doesn’t resolve it, please reply with: - Your Call ID - The exact error message or behavior (e.g. 401 Unauthorized, timeout, etc.) - Whether it’s happening on inbound, outbound, or both trunks - Any recent configuration changes Once we have that info, we can help pinpoint the issue faster.

To initiate outbound calls via Vapi after setting up your SIP trunk, use the following API call example:

bash
curl -X POST "https://api.vapi.ai/call/phone" \
  -H "Authorization: Bearer YOUR_VAPI_PRIVATE_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "assistantId": "YOUR_ASSISTANT_ID",
    "customer": { "number": "15557654321", "numberE164CheckEnabled": false },
    "phoneNumberId": "YOUR_PHONE_NUMBER_ID"
  }'

Ensure your SIP trunk credential and phone number are correctly configured in Vapi before making this call. For more details, see the [Vapi SIP Trunking guide](https://docs.vapi.ai/advanced/sip/sip-trunk). Source: - [SIP Trunking](https://docs.vapi.ai/advanced/sip/sip-trunk)

@User @User @User Can you give me a step by step plan to follow to make BYO SIP Trunking work.