[Serusers] clarification about authentication

[Iqbal]

Hi

www_authorize , will this always fail, ? because it seems to and then a 
www.challenge is sent.

In www.challenge, is it okay to leave the realm blank, as I have done, 
or is it better practice to have the same realm as that in 
www_authorise("", "1");

check_to should only be run if auth is correct above , is that correct?

Why run check_to at all, ?
and then u have proxy_auth and proxy_challenge, and is_from_local and 
is_uri_local, surely all these dont need to be used as checks in INVITE 
or do they.

Iqbal