i have the same issue and hope someone could shed a light.

2014-05-06 5:59 GMT+08:00, Oleg Stolyar <olegstolyar@gmail.com>:

> Hi guys,
>
> I am using the api_hangup_hook variable to let my internal system know when
> a call is terminated.
>
> Every now and then  my calling party cancels the SIP Invite before my dial
> plan is finished.  IN this case FreeSWITCH properly responds with a "487
> Request Terminated"
>
> However, this does not fire the command assigned to the api_hangup_hook
> variable.  This is probably also proper since the call has not yet been
> established.
>
> My question is whether there is a place somewhere where I can hook into the
> processing of the CANCEL SIP message.
>
> Thank you
> Oleg
>

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