Re: Re: [nist-sip-dev] what to do when NOTIFY arrives before OK on SUBSCRIBE ?

Jeroen,

Yes you are correct. I did not consider it. Thanks for pointing it out. 
I will fix it. CCing the newsgroup to let people know that there still 
is a problem.

Regards and thanks for your excellent feedback.

Ranga

Jeroen van Bemmel wrote:

> Ranga,
>
> There is a problem here: How will the application match the NOTIFY 
> with a subscription it initiated? And who (application or stack) is 
> supposed to send "481 call/transaction does not exist" when the NOTIFY 
> does not match an existing subscription?
>
> My approach is to maintain dialogs using { from-tag + call-id } as 
> key. Then, when a NOTIFY comes in, this is used to lookup the 
> corresponding SUBSCRIBE-initiated dialog, and 481 is sent when it does 
> not exist.
>
> The above setup is also needed to support forking: when multiple 
> NOTIFYs with different from-tags arrive, N dialogs should be created. 
> If you only create the dialog upon SUBSCRIBE 200 OK, it won't work 
> (since other 2xx responses may get filtered by proxies)
>
> Regards,
>
> Jeroen
>
> ----- Original Message ----- From: "M. Rangnathan" <[email protected]>
> To: "Bayart, Frederik" <[email protected]>
> Cc: <[email protected]>; "sip mailing" <[email protected]>
> Sent: Sunday, April 16, 2006 5:28 AM
> Subject: [nist-sip] Re: [nist-sip-dev] what to do when NOTIFY arrives 
> before OK on SUBSCRIBE ?
>
>
>> Hi Frederik,
>>
>> This case is working. I modified the examples/subsnotify to send 
>> notify first. My original answer was wrong. Yes the 
>> getServerTransaction should indeed return a null pointer, This is 
>> because the dialog has not yet been established by the Subscribe (it 
>> gets established on an OK). You can create one using 
>> sipProvider.getNewServerTransaction().
>>
>> I have committed the new example to the nist cvs repository.
>>
>> Ranga
>> Bayart, Frederik wrote:
>>
>>> Hallo Ranga,
>>>
>>> Did you had time to look at this problem ?
>>>
>>> Best regards,
>>>
>>> Frederik
>>>
>>> -----Original Message-----
>>> From: M. Ranganathan [mailto:[email protected]]
>>> Sent: Monday, March 20, 2006 8:06 PM
>>> To: Bayart, Frederik
>>> Cc: [email protected]
>>> Subject: Re: [nist-sip-dev] what to do when NOTIFY arrives before OK on
>>> SUBSCRIBE ?
>>>
>>>
>>> Hi Frederik,
>>>
>>> It should not return a null pointer. I will check and fix the bug if 
>>> it exists.
>>>
>>> Ranga
>>>
>>> If you can Bayart, Frederik wrote:
>>>
>>>
>>>> Hallo,
>>>>
>>>> Can someone tell me how to proceed in the next case :
>>>>
>>>> |  SUBSCRIBE       |
>>>> | ---------------> |
>>>> |                  |
>>>> |    NOTIFY        |
>>>> | <--------------- |
>>>> |                  |
>>>> |    OK SUBSCRIBE  |
>>>> | <--------------- |
>>>>
>>>>
>>>> If the NOTIFY arrives before the OK on the SUBSCRIBE, the call to 
>>>> event.getServerTransaction( ) in the function processRequest( 
>>>> RequestEvent event ) returns a null pointer. According to me, this 
>>>> is because the OK on the subscribe is not arrived yet. So I can't 
>>>> reply on the NOTIFY (with the function event.getServerTransaction( 
>>>> ).sendResponse). What is the way to detect this case and to proceed ?
>>>>
>>>> Regards,
>>>>
>>>> Frederik
>>>>
>>>>
>>>> _______________________________________________
>>>> nist-sip-dev mailing list
>>>> [email protected]
>>>> http://fs4.antd.nist.gov/mailman/listinfo/nist-sip-dev
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>
>>
>> -- 
>> M. Ranganathan
>> Advanced Networking Technologies Division,
>> National Institute of Standards and Technology (NIST),
>> 100 Bureau Drive, Stop 8920, Gaithersburg, MD 20899. tel:301 975 3664 
>> , fax:301 590 0932 http://w3.antd.nist.gov/
>> Advanced Networking Technologies For the People!
>>
>>
>> _______________________________________________
>> nist-sip mailing list
>> [email protected]
>> http://www-x.antd.nist.gov/mailman/listinfo/nist-sip 
>
>
>
> _______________________________________________
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>


-- 
M. Ranganathan 

Advanced Networking Technologies Division,
National Institute of Standards and Technology (NIST),
100 Bureau Drive, Stop 8920, Gaithersburg, MD 20899. 
tel:301 975 3664 , fax:301 590 0932 http://w3.antd.nist.gov/
Advanced Networking Technologies For the People!