looks to me like your http request is completely seperate from the soap object. try something like this instead:

class testSoap extends Thread{

String url = "";
String serverResponse = "";

public void run() {
try {
SoapObject RPC = new SoapObject("http://webservices.mycompany.net/module", "webservicename");
RPC.addProperty("parameterName", "");
serverResponse = "" + new HttpTransport(url, "http://webservices.mycompany.net/module/webservicename").call(RPC);
}catch (SoapFault sf){

}catch(Exception e){

}
System.out.println("serverResponse = " + serverResponse);
}