<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
   <soap:Body>
      <ns2:sendMessageResponse>
         <return>
            ...

public interface ISyncChannel {
    @WebResult(name = "response", targetNamespace = "")
    @RequestWrapper(localName = "SendMessage", targetNamespace = "..", className = "..")
    @WebMethod(operationName = "SendMessage")
    @ResponseWrapper(localName = "SendMessageResponse", targetNamespace = "..", className = "..") 
       SyncSendMessageResponse sendMessage(
        @WebParam(name = "request", targetNamespace = "")
       SyncSendMessageRequest request
    ) throws SendMessageSendMessageFaultMsg;
}