Reading Obis Object values

Hi All

We trying to read DLMS meters.
We can successfully connect and create association views. We are now trying to read the values of the GXDLMSObject's but we are not able to identify the reading value in the reply object when doing a Read as per the example below:
Read attribute value.public object Read(GXDLMSObject it,int attributeIndex)
{
GXReplyData reply = new GXReplyData();
ReadDataBlock(Client.Read(it.Name, it.ObjectType, attributeIndex), reply);
return Client.UpdateValue(it, attributeIndex, reply.Value);
}

We are trying to Read OBIS Code: 1.1.32.7.0.255 Ch. 1 - L1 Voltage Inst. value
And receiving this reply object when sterilized to JSon:
{"DataType":9,"Value":"AQEgBwD/","ReadPosition":8,"PacketLength":23,"RawPdu":false,"Command":196,"CipheredCommand":0,"Data":{"Capacity":12,"Position":0,"Size":8,"Available":8,"Data":"CQYBASAHAP8gBwD/"},"IsComplete":true,"FrameId":82,"InvokeId":193,"Error":0,"EmptyResponses":0,"TotalCount":0,"CipherIndex":0,"Time":"0001-01-01T00:00:00","BlockNumber":0,"BlockNumberAck":0,"ClientAddress":18,"TargetAddress":18,"ServerAddress":16,"SourceAddress":16,"Gateway":null,"IsMoreData":false,"IsNotify":false,"MoreData":0,"ErrorMessage":"","Count":0,"Peek":false}

TX: 10:18:45 7E A0 19 21 25 32 8C 09 E6 E6 00 C0 01 C1 00 03 01 01 20 07 00 FF 01 00 38 36 7E
RX: 10:18:48 7E A0 18 25 21 52 30 72 E6 E7 00 C4 01 C1 00 09 06 01 01 20 07 00 FF 04 08 7E

BlockCipher key: 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
Authentication Key:D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 DA DB DC DD DE DF
1: 7E A0 18 25 21 52 30 72 E6 E7 00 C4 01 C1 00 09 06 01 01 20 07 00 FF 04 08 7E
<HDLC len="17" >
<TargetAddress Value="12" />
<SourceAddress Value="10" />
<FrameType Value="52" />
<PDU>
<GetResponse>
<GetResponseNormal>
<!-- Priority: High, ServiceClass: Confirmed, Invoke ID: 1 -->
<InvokeIdAndPriority Value="C1" />
<Result>
<Data>
<!-- 1.1.32.7.0.255 -->
<OctetString Value="0101200700FF" />
</Data>
</Result>
</GetResponseNormal>
</GetResponse>
</PDU>
</HDLC>

Is the OctetString the meter reading and how do we translate the value?
If its not the reading where / how do we get it?
Please could you help with some insight.
Regards
Gavin