Article is in development so I will put just the bullets what to do. Thanks go to Tomaž Cerar for extensive support on this.

• Should create a folder \modules\org\jboss\client\legacy
• put there files module.xml and jbossall_client jar from 4.2.3
• In maven  pom.xml maven-war-plugin entry declare

          <archive>
                  <manifestEntries>
                      <Dependencies>org.jboss.client.legacy</Dependencies>
                  </manifestEntries>
          </archive>

• Do the usual magic for ejb call

Properties properties = new Properties();

properties.put(Context.INITIAL_CONTEXT_FACTORY, "org.jnp.interfaces.NamingContextFactory");

properties.put(Context.PROVIDER_URL, jnpurl);

properties.put(Context.URL_PKG_PREFIXES, "jboss.naming:org.jnp.interfaces");

properties.put(Context.SECURITY_PRINCIPAL, username);

properties.put(Context.SECURITY_CREDENTIALS, pswd);

Context context = new InitialContext(properties);

Object o = context.lookup(jndi);

Thats about it, no .properties file for call on 4.2.3, probably works also for legacy calls on version 5.x,6.x, but haven't tested it yet