Re: [Sipping-tispan] Re: CCBS/CCNR in Version -02f

[Miguel Garcia <[e-mail]>]

John:

I think that the role of the CCBS/CCNR server on the caller side is to 
arbitrate the caller's queue (of CCBS/CCNR request), and monitor its 
status (as to change the state from pending to suspended and back to 
pending).

/Miguel


Elwell, John wrote:
> Sebastien,
> 
> I was not trying to open up an old debate. I was simply continuing the
> recent debate about on whose behalf the service provider is acting, and
> whether there are two service providers or one. I can see a role for a
> service provider acting on behalf of the callee, since it needs to look out
> for different UAs registered for the AoR concerned that might be in a
> position to satisfy the CCBS/CCNR request. I am not sure I understand what a
> service provider acting on behalf of the caller would do. It would be good
> to get an answer to my question about whether a CCBS/CCNR request results in
> a call from the same UA as that from which the request was made or any UA
> registered as contact for the caller's AoR.
> 
> John
> 
> 
> 
>>-----Original Message-----
>>From: GARCIN Sebastien RD-CORE-ISS 
>>[mailto:[e-mail]] 
>>Sent: 29 September 2005 09:11
>>To: Elwell, John; Miguel Garcia; Michael Hammer (mhammer)
>>Cc: Tessa Silvia; [e-mail]
>>Subject: RE: [Sipping-tispan] Re: CCBS/CCNR in Version -02f
>>
>>John,
>>
>>You seems to want try and open the endless debate about where 
>>the intelligence should be placed in the network or in the 
>>terminals. The approach you are proposing is not something 
>>that TISPAN will accept so I suggest that we move out of this debate.
>>
>>sébastien 
>> 
>>
>>-----Message d'origine-----
>>De : [e-mail] 
>>[mailto:[e-mail]] De la part de Elwell, John
>>Envoyé : jeudi 29 septembre 2005 08:20
>>À : Miguel Garcia; Michael Hammer (mhammer)
>>Cc : Tessa Silvia; [e-mail]
>>Objet : RE: [Sipping-tispan] Re: CCBS/CCNR in Version -02f
>>
>>Miguel,
>>
>>In-line,
>>
>>John
>>
>>
>>>-----Original Message-----
>>>From: Miguel Garcia [mailto:[e-mail]]
>>>Sent: 28 September 2005 10:31
>>>To: Michael Hammer (mhammer)
>>>Cc: Tessa Silvia; [e-mail]
>>>Subject: Re: [Sipping-tispan] Re: CCBS/CCNR in Version -02f
>>>
>>>Hi Mike:
>>>
>>>Inline discussion.
>>>
>>>Michael Hammer (mhammer) wrote:
>>>
>>>
>>>>Miguel,
>>>>
>>>>I think there is still a little bit of schizophrenia in the 
>>>>requirements.  I assume that a server is acting on behalf
>>>
>>>of either the
>>>
>>>>caller or the callee, but not both because each could be 
>>
>>served by a 
>>
>>>>different host, domain, or organization.  The first
>>>
>>>requirement seems to
>>>
>>>>assume that the CCBS is a terminating service of the 
>>
>>callee.  Other 
>>
>>>>requirements seem to assume that the CCBS is a service of
>>>
>>>the caller.
>>>
>>>>Which is it?
>>>
>>>Both. It has been demonstrated that CCBS is a service that requires 
>>>cooperation of both the originating and terminatine service 
>>
>>providers.
>>
>>>This cooperation is mostly required to manage queues of both the 
>>>caller and callee, and to manage susped/resume states.
>>
>>[JRE] It is not clear to me what the involvement of the 
>>originating service provider is. Perhaps this comes down to 
>>what exactly are the requirements for notifying the caller 
>>that a call may now succeed. Is this notification constrained 
>>to go to the same UA that requested CCBS/CCNR in the first 
>>place, or should it go to any UA currently registered as a 
>>contact for the caller's AoR? In my opinion the former is 
>>sufficient and indeed probably preferable. If I request 
>>CCBS/CCNR from a particular UA I would expect to receive the 
>>notification on that same UA and make the new call attempt 
>>from there. In the relatively infrequent event that I move to 
>>a different UA in the intervening period, I could simply 
>>request CCBS/CCNR again from the new UA.
>>
>>So on the assumption that CCBS/CCNR involves only a single UA 
>>on the caller side, what service does the originating service 
>>provider perform? Why can't the UA directly request CCBS/CCNR 
>>and communicate with the service provider on the callee side 
>>to achieve this? The caller's UA will receive notification 
>>when a the call can be made and can present that information 
>>to the caller somehow, allowing the caller to choose when to 
>>proceed with that call, e.g., whether to interrupt any 
>>ongoing communications in order to make that call.
>>
>>
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>>https://www1.ietf.org/mailman/listinfo/sipping-tispan
> 
> 

-- 
Miguel A. Garcia           tel:[phone]
sip:[e-mail]
Nokia Research Center      Helsinki, Finland


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