[SR-Users] Session authorization just before initiate it

[Roberto Fichera]

Hi All in the list,

I'm new to Kamailio but I'm actually able to quickly setup a server, including
also the SIP presence, looking at the example I found at

http://kb.asipto.com/kamailio:presence:k31-made-simple

which explain very well how to do it. I also made some changes in the final
setup and everything seems working well, I can have audio/video/chat session
including the presence status of any user.

Now I would like to improve my testing setup so that for each
call request Kamailio receive, I would like to perform some SQL lookup for
deciding if the conversation might be established or not.
About the SQL lookup I read about the SQLOPS module, it seems really easy
to use, but I don't know where to put such check before the INVITE.

Could someone give me some hints?

P.S: Indeed, I need to read some good documentation about how to code a
Kamailio config file. Any URL to suggest?

Thanks in advance,
Roberto Fichera.