Get Voice receipts

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                "digits": "2",
                "error_code": null,
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                "message_id": "31BC271B-1E0C-45F6-9E7E-97186C46BB82",
                "message_type": "voice",
                "status_code": "201",
                "status_text": "Success: Message received on handset.",
                "timestamp": "1442381791",
                "timestamp_send": "1442381791"
            },
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                "message_type": "voice",
                "status_code": "201",
                "status_text": "Success: Message received on handset.",
                "timestamp": "1442381829",
                "timestamp_send": "1442381829"
            }
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        "to": 2,
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    "http_code": 200,
    "response_code": "SUCCESS",
    "response_msg": "Here are your delivery receipts."
}