Thank you for the hint. 
The api_hangup_hook seems to work only for the first call and for the attended transfer call in the background.

At the moment I have a working solution using the event CHANNEL_HANGUP_COMPLETE and by parsing the different variables sending the phone a popup via XML.
In some situation the script get confused. I’m still experimenting and I will report them back after.

Raphael

On 10 Feb 2015, at 16:53, Michael Collins <msc@freeswitch.org> wrote:

You could set api_hangup_hook on either of these legs and have the API send out a NOTIFY (or anything you want, I suppose) at hangup.
https://freeswitch.org/confluence/display/FREESWITCH/Variables#Variables-api_hangup_hook

Please experiment and report back!

-MC
 

Thank you very much!

Raphael
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