</soap:Header>
<soap:Body>
<cwmp:GetParameterNames>
- <cwmp:ParameterPath></cwmp:ParameterPath>
+ <cwmp:ParameterPath>InternetGatewayDevice.DeviceInfo.SerialNumber</cwmp:ParameterPath>
<cwmp:NextLevel>0</cwmp:NextLevel>
</cwmp:GetParameterNames>
</soap:Body>