//login and get sessionId
    var suds = new SudsClient({
    endpoint: 'my endpoint from the WSDL',
	targetNamespace: 'urn:enterprise.soap.sforce.com',
	soapAction: 'login'
	});

	var callparams = {
    username: 'my username',
    password: 'my password'
};
    suds.invoke("login", callparams, function(xmlDoc) {
    var loginresults = xmlDoc.documentElement.getElementsByTagName("loginResponse");
    var sessionId = loginresults.item(0).getElementsByTagName("sessionId").item(0).text;
	var serverUrl = loginresults.item(0).getElementsByTagName("serverUrl").item(0).text;
    Titanium.App.Properties.setString('sessionId',sessionId);
	Titanium.App.Properties.setString('serverUrl',serverUrl);
});