public with sharing class CallUpdatePersonAttributes_pt {


    @future (callout=true)
    public static void updateCDBPerson(){
         HttpRequest req = new HttpRequest();
            req.setEndpoint('http://192.168.25.175:8011/PersonDS/ProxyService/PersonDS');
            req.setMethod('POST');
            req.setHeader('Content-Type', 'text/xml; charset=utf-8');
            req.setHeader('Authorization', 'OAuth '+UserInfo.getSessionId());
            //req.setHeader('SOAPAction', 'https://api.authorize.net/soap/v1/CreateCustomerProfile');//

            //send the request
            Http http = new Http();
            HttpResponse res = http.send(req);
            string b =   '<?xml version="1.0" encoding="utf-8"?><soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">'+
                      '<soap:Body>'+
                    '<ns1:UpdatePersonAttributesRequest xmlns:ns1="urn:engineersaustralia:cdm:generic:common:service:v1">'+
                    '<ns1:PersonID>2713020</ns1:PersonID>'+
            '<ns1:Sex>M</ns1:Sex>'+
            '<ns1:UpdatedBy>1111</ns1:UpdatedBy>'+
        '</ns1:UpdatePersonAttributesRequest>'+
    '</soap:Body></soap:Envelope>';
        req.setBody(b);
        try{
            res = http.send(req);
             System.debug(res.toString());
          System.debug('STATUS:'+res.getStatus());
          System.debug('STATUS_CODE:'+res.getStatusCode());
        }
        catch(System.CalloutException e){}

    }

}

trigger TestDBAdapTrigger on Contact (after update) {

    for(Contact ct:Trigger.new){
        CallUpdatePersonAttributes_pt.updateCDBPerson();
    }

}