json
{
    "type": "transferCall",
    "function": {
        "name": "transfer_office",
        "description": "Transfers call to office phone number",
        "parameters": {
            "type": "object",
            "properties": {},
            "required": []
        }
    },
    "destinations": [
        {
            "type": "number",
            "number": "+1[number]",
            "message": "",
            "description": "",
            "transferPlan": {
                "mode": "warm-transfer-say-message",
                "message": "",
                "sipVerb": "dial"
            },
            "numberE164CheckEnabled": true
        }
    ]
}