[SR-Users] Late parallel branch (without canceling previous pending branches)

[Daniel-Constantin Mierla]

Hello,

On 5/30/11 1:14 PM, Iñaki Baz Castillo wrote:
> Hi, just wondering whether the following scenario (which it's not
> possible in kamailio 1.5) is possible in 3.X:
>
> 1) Alice calls a PSTN number.
>
> 2) Proxy receives the call and routes it to a media server which plays
> an early-announcement (30 seconds long).
>
> 3) After N seconds (maybe 10 seconds) proxy starts a new parallel
> branch to the PSTN gateway *without* cancelling the previous branch
> with the media server.
>
> 4) Let's suppose the PSTN phone rings and proxy gets 183 with SDP
> (ringing in real audio). Proxy converts such 183 into a 180 with no
> SDP (already possible in Kamailio).
>
> 5) After 30 seconds media server rejects the call with 480. PSTN
> branch remains ringing as usual.
>
>
> I just would like to know if Kamailio 3.X allows point 3. I think it's
> hard but maybe I miss some feature.
the best you have to code it in C, should not be that hard:
- keep the transaction ID in some list
- after a while, based on a timer process, lookup transaction
- add a branch and forward it

Or, if possible, fake somehow a negative reply and inject it from the 
network, then kamailio will trigger a failure route, the media server 
will still play.

Or put another proxy before media server, use rtimer+mqueue to cancel a 
transaction after a while with:
http://kamailio.org/docs/modules/stable/modules_k/tmx.html#id2784882

Inside intermediary proxy, drop the cancels. It might work at the end :-)

Cheers,
Daniel

-- 
Daniel-Constantin Mierla -- http://www.asipto.com
http://linkedin.com/in/miconda -- http://twitter.com/miconda