Problem consuming dot net webservice usign nusoap.

Hi,
I am trying to consume my web service (which is in asp.net/vb.net) in
my php page using nusoap.

My WebMethod code is :
<WebMethod()> _
Public Function GetMsg(ByVal abc As String) As String
Dim Text As String
Dim sr As StreamWriter
sr = File.CreateText("E:\Amol\test\Webservicetest.txt")
sr.Write("<Start>")
sr.Write(abc)
sr.Write("<End>")
sr.Close()
sr = Nothing
Return "Sucessful"
End Function

and the PHP Code is
<?
require_once('nusoap.php');

$wsdl="http://localhost/GreetingService/Service1.asmx?wsdl";;
$client=new soapclient($wsdl,'wsdl');

$resp=$client->call('GetMsg','Test');
print_r($resp);
?>

I am using nusoap in php to access the webservice.
The Webmethod is returning the message alright but the value which I
am passing is not being written to the txt file.
I am not understanding what is going wrong.

The error I am getting is :  ( [faultcode] => soap:Client
[faultstring] => Server did not recognize the value of HTTP Header
SOAPAction: . [detail] => )

I read on a microsoft forum that appending
[SoapDocumentService(RoutingStyle=SoapServiceRoutingStyle.RequestElement)]
before the webservice class will do the trick.
but it gives me another error.

( [faultcode] => soap:Client [faultstring] => The request element
<GetMsg xmlns='http://tempuri.org'> was not recognized. [detail] => )

My requirement is that my php page should send some parameters to my
webservice (it is on microsoft platform) e.g. product Id and the
webservice returns all relavent details for that product to the page
which is displayed on the page.
My pages have to be in php and at present I am using microsoft
technologies at the backend, asp, asp.net, vb.net ms sql server.
Any help will be appreciated.
Any alternative ways will also be appreciated.

I am new to this.
Any help preferably with examples (or links) will be greatly appreciated.

Amol


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