public DSIPack(Stream si) {
BER br = new BER(si);
Flags = br.ReadByte();
Command = br.ReadByte();
RequestID = br.ReadUInt16();
ErrorCode = br.ReadInt32();
TotalDataLength = br.ReadUInt32();
Reserved = br.ReadUInt32();
Payload = br.ReadBytes(Convert.ToInt32(TotalDataLength));
}