asterisk users - Jan 2015 - Adding an Event on chan_sip.c (asterisk 1.8.22)

In some situations I got the following message on asterisk console:

* Autodestruct on dialog '857128833 at 192.168.2.129
<857128833 at 192.168.2.129>' with owner SIP/1015-00000002 in place
(Method:
BYE). Rescheduling destruction for 10000 ms*

I would like to raise a manager event, to take some action when it is
happening.

To do so, I believed that was just a matter of adding an manger_event call
as follows:

* owner = sip_pvt_lock_full(p);*
* if (owner) {*
* ast_log(LOG_WARNING, "Autodestruct on dialog '%s' with owner %s
in place
(Method: %s). Rescheduling destruction for 10000 ms\n", p->callid,
owner->name, sip_methods[p->method].text);*
* manager_event(EVENT_FLAG_SYSTEM, "MY-HANGUP-ALERT", "channel:
%s\r\n",
owner->name);*

But for some reason, I don't get such event on my ami client.

What is going wrong?

Thanks,

Valter
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