the short answer is "you can't".
NetTalk has been designed to pass the session id as a cookie, and while it's probably possible to make it behave like this, it would need a good knowledge of JavaScript, and indeed a modification to most of the shipping JavaScript files.
In the early days of NT4 this option was supported - but was removed for security reasons. parameters in the URL are recorded by proxies, ISP's and so on, and generally left lying around - and that can result in session hijacking in some cases.
So, a nettalk app needs "memory cookies" on, and JavaScript on. Without those two the site isn't gonna work.
cheers
Bruce