Re: AW: [Sipping] comments on draft-roach-sipping-callcomp-bfcp-00

Huelsemann, Martin wrote:

> Hi Jonathan, all,
> 
> I don't think that there really is a relationship between presence
> and call completion. Presence is about the general availibility of a
> certain user, call completion provides the possibility to complete a
> call to a certain destination you've got a busy error response from.

I completely disagree.

When you invoke the CCBS service, the ringback you get when they are 
"available" is exactly presence. However, in the PSTN, it is limited to 
the only concept of presence they have - whether you are on a call or not.

In an IP world, I can be unavailable for voice service even though I'm 
not in a call strictly speaking. For example, if I've got five parallel 
IM sessions, and as a consequence, I set my voice service to "closed" 
through presence, what is the desired behavior of the SIP-based CCBS 
system? I would assert that I *dont* want the callback to come now. If 
it does, I won't answer it anyway since I'm busy with other things. So, 
the call goes to voicemail or goes unanswered. That does not seem like 
the desired behavior.

-Jonathan R.
-- 
Jonathan D. Rosenberg, Ph.D.                   600 Lanidex Plaza
Cisco Fellow                                   Parsippany, NJ 07054-2711
Cisco Systems
jdrosen@cisco.com                              FAX:   (973) 952-5050
http://www.jdrosen.net                         PHONE: (973) 952-5000
http://www.cisco.com

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