Re: [Sipping] Internet draft on missed calls / msgs notification

[Paul Kyzivat <pkyzivat at cisco.com>]

henry at sinnreich.net wrote:
> > I think the "server vs. peer-to-peer" distinction is a bit too simple.
> > In reality, a SIP call could go through multiple levels of routing 
> > and translation, each of which has its own logical view of "call history".
>
>
> This is true and comes with a price tag however and the point of view
> differs if you are the payer or the payee :-)
>
> A user group such as "Our Class Reunion" can set up an ad hoc P2P network at
> no cost if their SIP UA can support P2P and its features, such as voice
> mail.
>
> A "hot line" or emergency call center has obviously very different
> requirements that may be better implemented in complex SIP server clouds;
> though it could be argued that a self organizing P2P SIP server cloud has
> lower cost for operations and is more resilient as well.
>
> The proposed P2P SIP BOF at the 64 IETF may bring some light on this.
>
> Call history and the logs can be very critical for legal reasons or help
> with CALEA type of requirements but may be of less importance for small
> communities of interest.

I think they are of potential value for many reasons, even among small 
communities. But I think this should clearly be an optional capability. 
You can only subscribe to it if it is available.

In communities where presence is universally used, and universally 
available, missed calls probably just won't happen, because people won't 
call if you aren't present. In that case a missed call list is probably 
of no interest.

But in any community where there are users that are strangers to one 
another, and that don't permit all to see their presence, there will be 
missed calls. In that kind of context a missed calls list is useful.

And I believe a missed call list based in a server rather than just in 
the UAs, is more important when the UAs are mobile or soft than it is 
when they are "always on" as is the case in the traditional wired 
telephone network.

	Paul

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