Error in XML Document While Processing SOAP Response

Yes, you should use your SOAP extension into your client app.

Example

Try adding the below code:

<webServices>
   <soapExtensionTypes>
      <add type="DebugTools.SOAP.SOAPTrace.SoapTraceExtension, DebugTools.SOAP"
         priority="0" group="High"/>
   </soapExtensionTypes>
</webServices>

DebugTools.SOAP.SOAPTrace is the namespace of the SoapTraceExtension.

DebugTools.SOAP is the name of the assembly containing the soap trace code.