[Serusers] Which SIP messages types use lookup("location")?

[Andreas Granig]

Vitaly Nikolaev wrote:
> All other should go by loose route or another method (strict?).  

Maybe often answerd, but I still haven't got it:

How exactly should loose_route() be used? Can I in any case do

setflag(1); # account the message
if(loose_route()) { t_relay(); break; }
# messages without route headers go here and have to be lookup()-ed

or are there some exceptions? Are the loose-routed messages accounted 
correctly?

Thanks,
Andy