통화 생성

curl --request POST \
  --url https://client-api.tryvox.co/v2/calls \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "call_from": "<string>",
  "call_to": "<string>",
  "agent_id": "<string>",
  "agent_version": "production",
  "metadata": {
    "campaign": "봄_프로모션",
    "source": "ads"
  },
  "dynamic_variables": {
    "customer_name": "홍길동",
    "order_id": "A123"
  },
  "presentation_number": "<string>"
}
'

{
  "call_id": "<string>",
  "status": "<string>",
  "call_from": "<string>",
  "call_to": "<string>",
  "metadata": {},
  "dynamic_variables": {}
}