@Manan Khurana It seems like you've already taken some steps to set up your system, but you're encountering an authorization issue with Twilio when trying to make a call to the number 8888. The error message indicates that your Twilio account is not authorized to call this specific number, and it suggests checking international permissions. Here's what you can do to resolve this issue: 1. Visit the Twilio Console at the provided link: [Twilio Geo Permissions](https://www.twilio.com/console/voice/calls/geo-permissions/low-risk). 2. Ensure that you have the correct permissions set up for the countries you are trying to call, including any special or service numbers like 8888. 3. If you have already enabled all geo locations for your Twilio number, double-check that there are no restrictions on calling service numbers or specific types of numbers. 4. Review Zadarma's documentation and ensure that you have followed all the necessary steps for integrating with Vapi and that your SIP trunk settings are correctly configured. 5. If the issue persists, you may need to contact Twilio support to ensure that your account has the necessary permissions to make calls to the number you are trying to reach. If you have followed these steps and are still experiencing issues, please ask support for more info on this. They will be able to provide more detailed assistance based on your account and setup specifics.

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Got it. Tagging @User for additional help.

Additional information here. we were able to initiate call but the didn't succeed. Zadarma requires vapi IPs to be verified however when we're initiating call we're getting an error from twilio. is there any way to triger the call from Vapi. Here's the curl that i ran.

curl -X POST https://api.vapi.ai/call \
     -H "Authorization: Bearer XXXXXXXXXXXX" \
     -H "Content-Type: application/json" \
     -d '{
  "assistantId": "a1b4bc33-458c-498a-8527-af0XXXXXXX",
  "name": "",
  "customer": {
    "numberE164CheckEnabled": false,
    "sipUri": "sip:8888@sip.zadarma.com",
    "number": "4444"
  },
  "phoneNumberId": "f1c9cf01-b4f1-4a14-a525-c96`81b76b917`"
}'

Here's the call:

{
  "id": "d19c50e2-0545-4d59-a3ef-56dda8327fda",
  "assistantId": "a1b4bc33-458c-498a-8527-af0d00d2b782",
  "phoneNumberId": "f1c9cf01-b4f1-4a14-a525-c9681b76b917",
  "type": "outboundPhoneCall",
  "createdAt": "2025-01-23T11:35:12.536Z",
  "updatedAt": "2025-01-23T11:35:13.403Z",
  "orgId": "c7f27c78-b5bd-4444-a9dc-ac5ba4d792dc",
  "cost": 0,
  "customer": {
    "number": "4444",
    "numberE164CheckEnabled": false,
    "sipUri": "sip:8888@sip.zadarma.com"
  },
  "status": "ended",
  "endedReason": "twilio-failed-to-connect-call",
  "phoneCallProvider": "twilio",
  "phoneCallProviderId": "CA7e09606211a554cd175616dbf9c073e5",
  "phoneCallTransport": "pstn",
  "name": "",
  "monitor": {
    "listenUrl": "wss://phone-call-websocket.aws-us-west-2-backend-production1.vapi.ai/d19c50e2-0545-4d59-a3ef-56dda8327fda/listen",
    "controlUrl": "https://phone-call-websocket.aws-us-west-2-backend-production1.vapi.ai/d19c50e2-0545-4d59-a3ef-56dda8327fda/control"
  },
  "transport": {}
}