[asterisk-dev] SIP channel/owner question

[Miguel Molina]

Klaus Darilion escribió:
> Russell Bryant schrieb:
>   
>> On Jan 21, 2009, at 4:32 AM, Klaus Darilion wrote:
>>
>>     
>>> In SIP channel I have an struct ast_channel *ast. So, what is the
>>> difference between:
>>>
>>> ast->hangupcause
>>> and
>>> ast->tech_pvt->owner->hangupcause
>>>       
>> Assuming you're talking about "ast" as a parameter to a channel  
>> technology callback, ast and ast->tech_pvt->owner should be the same  
>> thing.
>>     
>
> When is the owner set?
>
> When an incoming INVITE is rejected with Hangup(1); ast->hangupcause is 
> set. But the function __transmit_response adds X-Asterisk-Hangupcause 
> according to ast->tech_pvt->owner->hangupcause. But as owner=NULL, the 
> header will not be added.
>
> At least this is the behavior of 1.4.23. Should I open a bug report?
>
> klaus
>
>
>   
I checked this once some time ago, and I saw that on chan_sip.c, the pvt 
structure is destroyed before sending the BYE message, and you would be 
right, the owner is NULL so no HangupCause Header added:

...

03593 
03594    /* Disconnect */
03595    if (p->vad <http://www.asterisk.org/doxygen/1.4/structsip__pvt.html#a62a1382425913a43d6111e71b9fa019>)
03596       ast_dsp_free <http://www.asterisk.org/doxygen/1.4/dsp_8c.html#0a57a1e374549eb2705068688f4046db>(p->vad <http://www.asterisk.org/doxygen/1.4/structsip__pvt.html#a62a1382425913a43d6111e71b9fa019>);
03597 
03598    p->owner <http://www.asterisk.org/doxygen/1.4/structsip__pvt.html#9241175b397dfd032c4cadbc8c9c2d05> = NULL;
03599    ast->tech_pvt <http://www.asterisk.org/doxygen/1.4/structast__channel.html#19aa04db5508cf9496602e694dc69e2f> = NULL;
03600 

...


So doing something like Hangup(17) on the dialplan using SIP channels 
would not set a busy HangupCause on the SIP header. For me this is a 
bug. Please correct me if I am wrong.

Regards,

>   
>> --
>> Russell Bryant
>> Digium, Inc. | Senior Software Engineer, Open Source Team Lead
>> 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
>> Check us out at: www.digium.com & www.asterisk.org
>>
>>
>>
>>
>>
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-- 
Ing. Miguel Molina
Grupo de Tecnología
Millenium Phone Center
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