curl --request DELETE \
  --url https://api.itellico.ai/v1/accounts/{account_id}/sip-trunks/{sip_trunk_id} \
  --header 'X-API-Key: <api-key>'

{
  "code": "validation_error",
  "detail": "from_number is required for phone calls",
  "message": "Validation failed"
}