[OpenSIPS-Users] how to cancel an INVITE before the callee receive it?

[merlin.li at tsingch.com]

Hi Chircu,

one more question, 
Your solution:
1) set $T_fr_timeout and $T_fr_inv_timeout to 1
2) t_on_failure(...) [1]
3) t_relay() to a bogus gateway [2]
4) catch the 408 timeout in the failure route. Using an $avp counter, go 
back to step 1) until 30 tries have been done. In this failure route, 
you may now also use t_was_cancelled().
How can i let the opensips from step 4 to step 1?And what i want to use is t_cancel_branch(), not t_was_cancelled()



merlin.li at tsingch.com
 
From: Liviu Chircu
Date: 2015-03-05 18:47
To: merlin.li at tsingch.com; users
Subject: Re: [OpenSIPS-Users] how to cancel an INVITE before the callee receive it?
Hello merlin,

I have already given you the solution [1], but you did not read the email. It is also A LOT more efficient than your while+sleep loop, since it does not block the OpenSIPS workers at all - they are free to process all incoming traffic. Please implement it, send "404 Not Found" to the _caller_ when you decide to stop the call, and let me know if there are any problems :)

[1] : http://lists.opensips.org/pipermail/users/2015-March/031022.html
Liviu Chircu
OpenSIPS Developer
http://www.opensips-solutions.com
On 05.03.2015 12:16, merlin.li at tsingch.com wrote:

Hi Chircu,

I got an idea, and tested it, but the result confuse me. 
In the CANCEL processing block, i use  set_dlg_flag("1") to set a dialog flag,

if (is_method("CANCEL"))   # in the route block
        {
                if (t_check_trans()){
                        if(!is_dlg_flag_set("1")){
                            set_dlg_flag("1");
                            t_relay();
                            exit;
                        }
}
}

and in the while loop:
while( !lookup("location","m") ){
                            if(is_dlg_flag_set("1")){
                              t_reply("404","cancel the request!");
                              exit;
                             }
                .....
}

Sometimes , it works well, but sometimes, the CANCEL process is not executed until the loop finished.
What i said is i got two result, and i don't know why.
result 1:
when opensips received the CANCEL request , the dialog flag is set, then break the while loop.

result 2:
Caller issue a CANCEL request, but opensips didn't entering the CANCEL process until the while loop is finished.




merlin.li at tsingch.com


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