[Sipping] [RAI] Expert review of draft-sinnreich-sip-tools-03

[Adrian Georgescu <ag at ag-projects.com>]

Hi Paul,

I believe Henry is heading into one direction only. The idea is to  
help developers implement the minimum necessary features in their User  
Agent and not biased towards a voice only application. The SIP end- 
points as describe by Henry would work with any service provider as  
long as they talk plain SIP. So 911 and voicemail and other services  
can be performed in the network as well, they are just another end- 
point.

If I were to develop a SIP UA today (which  I do actually) Henry's  
draft would be the starting point. I would definitely add MSRP to it,  
without relays as a minimum but adding relay extension is not that  
difficult, because any application that requires reliable or large  
data transport need a TCP media plane that SIP signalling or RTP does  
not provide. End-to-end encryption can also be realized on top of  
established MSRP session. File transfer and session based IM are  
applications that an end user would take for granted today and SIP  
lacks both.

Also the rich presence conflicts with the basic presence PIDF, I would  
go for rich presence even if the "richness" of the information is  
something that would be avoided due to its complexity in the  
presentation to end-user interface.

For the rest I would not do much changes to the draft.

Regards,
Adrian

>>>>>>>>




Henry,

Based on this discussion, it now sounds like you are heading in *two*
directions:

- connecting to a SP that provides services (e.g. 911, maybe others,
   like voicemail, forwarding, ...)
   The SP in this case is largely looking for a "dumb" device and
   provides the services in the network. The "request for service"
   is then "tunneled" via simple services like invite, with the
   service request encoded in the AOR. (e.g. the "911", or "star"  
codes).
   In this case you are then competing with other profiles, such as
   SIPConnect or PacketCable.

- very low added value SP, that simple provides registration
   and routing. All services are provided by the UAs.

I'd like to see the goals spelled out better. Then we can discuss if
they are met.

	Thanks,
	Paul

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