[SR-Users] Late parallel forking

[Klaus Darilion]

On 21.07.2014 14:59, Daniel-Constantin Mierla wrote:
> Hello,
> 
> you may get similar results using t_cancel_callid(():
> - http://kamailio.org/docs/modules/stable/modules/tmx.html#idm8272
> 
> For each call you have to store the call-id, cseq and the target user
> somehow (e.g., using htable).
> 
> Then, when you have a registration, see if the user has an ongoing call
> towards him/her. If yes, cancel that transaction and you end up in
> failure route. Based the flags, you can see it was canceled on purpose
> and can do another lookup location to get now two branches.
> 
> You would need to store the initial caller address before looking up
> location, revert to it in failure route before looking up location again.
> 
> The behavior is not exactly the same as you requested, as first branch
> is canceled. But given that the branch will be called again in short
> time, the user might not notice anything in terms of ringing interruption.

The problem may be that there is a missed called on device 1. Maybe this
can be avoided by adding the reason header with "cause=200" if the
client supports it.

regards
Klaus