[Sip-implementors] sip CGI - where do i begin?

[m. smadi]

hi;
I have an asterisk server, which i am using as a registrar and PSTN GW.  
From the very basic understanding that i have of "PROGRAMMING SIP"  i 
should be able to write a SIP CGI script in Perl or C and run it on the 
my asterisk server to do certain tasks. 
Let's say that my mini goal is to recieve all the INVITE messages and 
based on the CONTACT header send it to a specific channel, can i do 
that? where do i begin? for example, is there and a special IDE i have 
to use? how do i interact with the server, etc...

Any feedback is higly appreciated.
thanks
moe smadi
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