[SR-Users] [OT] Fwd: [dispatch] proposed SIXPAC charter

[Daniel-Constantin Mierla]

Hello,

On 10/21/10 11:20 AM, Iñaki Baz Castillo wrote:
> 2010/10/21 Daniel-Constantin Mierla<miconda at gmail.com>:
>> I think it is just failure of one model over-complicated, the Presence
>> Agent.
>>
>> SIP has also end-to-end presence and it was/is working perfect in most of
>> the cases.
> Hi, I don't agree. SIP end-to-end presence fails when coming to
> privacy area as the watcher doens't receive the information from a
> server, but from the watched user itself (so the watcher knows if it's
> "online" or not). I've tryed end-to-end SIP presence and IMHO is just
> a toy.

this kind of privacy is affecting the calls as well, for example. I can 
send you a call or other SIP request to discover you are online/offline. 
So this is another service that should be applied globally: black-white 
lists.

Having a mechanism just for presence is another bad design.

> Also, about XMPP and "ent-to-end" presence:
>
> "distributing states" is done by sending<presence>  stanzas. XMPP
> basic presence (online, offline and text note) works in this way. This
> is, a XMPP client gets online and sends<presence>  stanza to all its
> non-blocked contacts to inform about its presence status.
> However, other presence features in XMPP as the avatar, advanced
> presence (like the music you are listening now), work with
> publish-subscribe mechanism. This mechanism is much more scalable.
>
> Please read this short thread I open in XMPP-IETF about it:
>   http://www.ietf.org/mail-archive/web/xmpp/current/msg01703.html
>
> This is: publish-subscribe mechanism has also being adopted by XMPP.
> So IMHO this mechanism is the most suitable also for SIP, but it must
> be improved (the specs and features).
With a model where client and server must develop in parallel you have 
always the chicken-egg problem.

While I said that some interaction between endpoint and core network has 
to be done (e.g., centralized rooster, hosting avatars, etc), it must be 
pretty much content agnostic. When the core network becomes an active 
player in the final content delivery of what I send, then innovation is 
slowed down considerably.

If you think about very popular solutions for real time communication 
out there, the patters is smart endpoint, dummy core network, and in 
most of the cases (skype, yahoo), same provider for both sides.

Telephony providers must understand they have to come with services 
provided by them in order for me to pay. If they put barriers because 
they want to charge the services I am capable alone to do, then I skip them.

Cheers,
Daniel

-- 
Daniel-Constantin Mierla
http://www.asipto.com