[SR-Users] Subscription-State: terminated;reason=terminated?

[Min Wang]

HI Klaus

     thanks.


     I will try  Sip-implementors first to see if others have the 
similar issue :)


kind regards


min


On 06/26/2012 10:09 AM, Klaus Darilion wrote:
> Hi Min!
>
> As your already digging into the standards please propose a solution 
> for correct behavior :-)
>
>
> On 26.06.2012 00:07, Min Wang wrote:
>> HI
>>
>> I did more analysis:
>>
>> as before, the configure is:
>>
>>       101 --- kamailio proxy/xcap server -- 102
>>
>>        101/102 : jitsi night build, xcap/SIMPLE mode
>>        kamailio is 3.3
>>        101 has 102 on its contacts list, and 102 has 101 on its contacts
>> list as well
>>
>> now 101 remove 102 from its contact,  proxy will send out NOTIFY to 102
>>
>> (1) if reason=terminated returned in NOTIFY ( this is the current
>> kamaili behavior)
>>
>>    According to RFC 3265:
>>      If no reason code or an unknown reason code is present, the client
>> MAY attempt to re-
>>     subscribe at any time (unless a "retry-after" parameter is present,
>>     in which case the client SHOULD NOT attempt re-subscription until
>>     after the number of seconds specified by the "retry-after"
>>     parameter).
>>
>>
>>      Jitsi 1.1  nightly will keep on re-subscribe ( at some random 
>> time ).
>>
>>      And kamailio/proxy will keep on reject the subscribe with: NOTIFY,
>> with reason=terminated.
>>
>>     It seems to waste some resources (bandwidth/db/cpu etc). Image if
>> there are a lot of deleted contacts :(.
>>
>>
>> (2) if reason=rejected  returned in NOTIFY
>>
>>      according to the same RFC:
>>
>>     rejected: The subscription has been terminated due to change in
>>        authorization policy.  Clients SHOULD NOT attempt to 
>> re-subscribe.
>>        The "retry-after" parameter has no semantics for "rejected".
>>
>>
>>      So the client will not send any re-subscribe, which is good, will
>> save some resources.
>>
>>      But there is an issue:
>>
>>      when 101 add 102 again,  after 101 puting pres-rules (allow 102) to
>> the xcap server ,
>>
>>      there will be two cases:
>>
>>      (2.a). If that subscription expired, or deleted by the kamailio
>> timer ( I hope I understand the code correctly)
>>
>>             of course kamailio will not send any NOTIFY (to 102).
>>
>>      (2.b). if that subscription do still exist in active_watcher, that
>> subscriptions will be marked as active
>>
>>             kamailio  will send  the NOTIFY to 102 indicating 101's 
>> status
>>
>>            But from 102 point of view:  since the subscription has been
>> terminated , this notify will be rejected as 481 non-exist.
>>
>>
>>      In neither case, can 102 see 101's status ( since 102 to 101's
>> subscription has been rejected/terminated from 102 point of view)
>>
>>
>>     So from pure end-user point of view,  that is not the expected
>> behavior.
>>     User expect the 102 can see 101's status since 101 now allow 102
>> again and 102 did not remove 101 from his contact list
>>
>>
>>     The question is:  how can we do it right?
>>
>>
>>
>>
>> Thanks.
>>
>>
>> min
>>
>>
>>
>>
>> On 06/25/2012 05:43 PM, Min Wang wrote:
>>> HI
>>>
>>> when I removed 102 from 101's contact list (using jitsi nightly 1.1
>>> build),  kamailio 3.3 send out NOTIFY to 102 like this:
>>>
>>>
>>> NOTIFY
>>> sip:102 at 192.168.122.147:5060;transport=udp;registering_acc=192_168_122_32 
>>>
>>> SIP/2.0.
>>> Via: SIP/2.0/UDP 192.168.122.32;branch=z9hG4bK1bfb.afbf0a85.0.
>>> To: sip:102 at 192.168.122.32;tag=f6a40771.
>>> From: sip:101 at 192.168.122.32;tag=a6a1c5f60faecf035a1ae5b6e96e979a-5724.
>>> CSeq: 4 NOTIFY.
>>> Call-ID: c7c52dd058268596ec84dd3c645a2f17 at 0.0.0.0.
>>> Content-Length: 0.
>>> User-Agent: kamailio (3.3.0-rc0 (x86_64/linux)).
>>> Max-Forwards: 70.
>>> Event: presence.
>>> Contact: <sip:192.168.122.32:5060;transport=udp>.
>>> Subscription-State: terminated;reason=terminated. <-----------------
>>>
>>>
>>>
>>> Note the reason code is:terminated.
>>>
>>>
>>> From rfc3265, The defined reason codes are:  deactivated/
>>> probation/rejected/ timeout/giveup/noresource
>>>
>>>
>>> What is the reason to send: reason=terminated instead one of the
>>> well-defined reason codes?
>>>
>>>
>>> There was a discussion regarding at:
>>>
>>> http://sip-router.org/tracker/index.php?do=details&task_id=133
>>> <http://sip-router.org/tracker/index.php?do=details&task_id=133>
>>>
>>>
>>> but I did not see the explaination of  reason=terminated.
>>>
>>>
>>> Thanks
>>>
>>>
>>> min
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
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>>> sr-users at lists.sip-router.org
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>>
>>
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