curl --request POST \
  --url https://api.altur.io/api/v1.0/call \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '{
  "agent_id": "<string>",
  "phone_number_to": "<string>",
  "end_user_display_name": "<string>",
  "end_user_context": "<string>",
  "initial_message": "<string>"
}'

{
  "id": "<string>",
  "thread": {
    "id": "<string>",
    "agent": {
      "id": "<string>",
      "name": "<string>"
    },
    "end_user": {
      "id": "<string>",
      "display_name": "<string>",
      "integration_type": "api",
      "info": "<string>"
    },
    "integration": {
      "id": "<string>",
      "type": "api"
    },
    "updated_at": "2023-11-07T05:31:56Z",
    "active": true,
    "blocked": true,
    "tags": [
      {
        "id": "<string>",
        "name": "<string>",
        "color": "blue"
      }
    ],
    "assigned_to": [
      {
        "id": "<string>",
        "email": "<string>",
        "first_name": "<string>",
        "last_name": "<string>"
      }
    ]
  },
  "type": "inbound",
  "status": "created",
  "answered_by": "human",
  "created_at": "2023-11-07T05:31:56Z",
  "started_at": "2023-11-07T05:31:56Z",
  "ended_at": "2023-11-07T05:31:56Z",
  "duration": 123,
  "billable_duration": 123
}