You should be able to use the MS SOAP 3.0 toolkit and some vbscript to do what you are requesting.
You can download the MS SOAP 3.0 toolkit at
http://download.microsoft.com/downlo...39/soapsdk.exe
Here is a function (untested) to get you started. You could add a function similar to the following example to your project script, then just add a Set Macro step with [GetSOAPValue()] as the value.
Function GetSOAPValue()
' (Using MS SOAP Toolkit 3.0)
' SOAP client object
Set clientACH = CreateObject("MSSOAP.SoapClient30")
' Output variables
Dim Result
' Initializing the SOAP client
clientACH.MSSoapInit "http://soap.example.com/soap-url"
' soap method
Result = clientACH.ConnectionCheck("Parameter1", "Parameter2")
GetSOAPValue = Result
End Function