[Serusers] performance on nat binding

[Richard]

Hi Jan,

In the NOTIFY message, it has a proxy authentication nonce got from REGISTER
messages.

I am not in the <some test here> if proxy_authorize() should be called and
the impact on the ser performance.

Richard

> 
>   Since the purpose of NOTIFY messages is just to get some reply from
>   SER and keep the NAT bindings open, I would recommend to put a simple
>   test at the beginning of the configuration file and send 200 OK
>   immediately, something like:
> 
>   if (method == "NOTIFY" && <some test here>) {
>   	sl_send_reply("200", "OK");
> 	break;
>   };
> 
>   Note that you have to replace <some test here> with something that
>   tests if this is one of the NOTIFYs keeping the NAT open, you could
>   probably test for some particular value in the Request-URI, or
>   something like that. You probably do not want to reply all NOTIFY
>   messages this way.
> 
>     Jan.