cannot invoke WSDL method using soap package in nodejs

I have some problems to moment invoke soap operations in specific WSDL using nodejs, actually use package soap version 0.5.0, I tested with some wsdls and working properly, but with this wsdl in specific cannot call to exposed services . Do you have had similar problem ?

This is part of client object in javascript before begin invoke operation :

    { wsdl: 
   { uri: 'http://dummyhost:8090/Dummy/Service?wsdl',
     callback: [Function],
     options: { attributesKey: 'attributes' },
     definitions: 
      { ignoredNamespaces: undefined,
        xmlns: [Object],
        '$targetNamespace': 'http://ws.dummy.com/',
        '$name': 'SwitchService',
        messages: {},
        portTypes: {},
        bindings: [Object],
        services: [Object],
        schemas: [Object],
        descriptions: [Object] },
     xml: '<?xml version="1.0" encoding="utf-8"?>.......... more wsdl content',
     services: { SwitchService: [Object] },
     xmlnsInEnvelope: ' xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd" xmlns:tns="http://ws.dummy.com/"' },
  SwitchService: { SwitchPort: {} } }

In this case object dont have operations for do calls to services .

This is part of client object before a called succesfull using other WSDL :

    { wsdl: 
   { uri: 'http://www.webservicex.net/Statistics.asmx?WSDL',
     callback: [Function],
     options: { attributesKey: 'attributes' },
     definitions: 
      { ignoredNamespaces: undefined,
        xmlns: [Object],
        '$targetNamespace': 'http://www.webserviceX.NET',
        messages: [Object],
        portTypes: [Object],
        bindings: [Object],
        services: [Object],
        schemas: [Object],
        descriptions: [Object] },
     xml:'<?xml version="1.0" encoding="utf-8"?>.......... more wsdl content',
     services: { Statistics: [Object] },
     xmlnsInEnvelope: ' xmlns:tm="http://microsoft.com/wsdl/mime/textMatching/" xmlns:tns="http://www.webserviceX.NET"' },
  GetStatistics: [Function],
  Statistics: 
   { StatisticsSoap: { GetStatistics: [Function] },
     StatisticsSoap12: { GetStatistics: [Function] } } }

In this case operation GetStatistics is service to consume .