Its a customer demand that they will use their own custom build login page.
One more thing!!!!
Except Apple IOS 7 series, all other devices inculding apple ios 6, andriod , windows, linux, mac are easily landing on the welcome page after login on the captive portal custom page. Please check my first post for the welcome page link.
Only IOS 7 devices are not able to land on the welcome page. Bypass CNA is also enabled. show welcome page is disabled.