Get call details

{
    "call": {
        "id": "uuid",
        "phone_number": "+4712345678",
        "direction": "inbound",
        "status": "transferred",
        "transfer_destination": "+4798765432",
        "duration_seconds": 120,
        "minutes_billed": 2,
        "cost_nok": 3.5,
        "recording_consent": true,
        "recording_url": "https://...",
        "transcript_json": [
            {
                "role": "assistant",
                "content": "Hei, velkommen..."
            },
            {
                "role": "user",
                "content": "Jeg trenger hjelp med..."
            }
        ],
        "functions_json": [
            {
                "name": "transferToHuman",
                "arguments": "{}",
                "result": "..."
            }
        ],
        "call_summary": "Kunden ringte ang. faktura...",
        "agent": {
            "id": "uuid",
            "name": "Support Agent"
        },
        "started_at": "2024-01-15T10:30:00Z",
        "ended_at": "2024-01-15T10:32:00Z"
    }
}