Re: [Sip] Comments to the TOTE draft

[Hadriel Kaplan <HKaplan at acmepacket.com>]

> -----Original Message-----
> From: sip-bounces at ietf.org [mailto:sip-bounces at ietf.org] On Behalf Of
> Miguel Garcia
>
> >
> > So then the question is, is MSRP a general purpose UA to UA transport
> > mechanism, or not. Frankly I think it is not. Its designed around
> > instant messaging which is a particular application. ITs having
> > extensions for things like nicknames and conferencing which are specific
> > to IM. The reporting feature is also IMHO very much an IM-specific
> thing.
>
> I disagree here. You said:
> - It is designed around instant messaging: I would say MSRP is designed
> around real-time transfer of objects. The MSRP draft provides examples
> and provisions for transferring, for example, large video files.
> - It's having extensions for things like nicknames and conferencing
> which are specific to conferencing: I don't see the point here. It is
> like if you tell me that SIP is not good for voice because there are
> extensions for presence, instant messaging and alike. MSRP is generic
> enough to carry objects between two points. Extensions try to improve
> the user experience for specific applications.

Not really.  We *DO* say SIP is not appropriate for carrying the voice itself (vs. RTP), or not appropriate for carrying session-based IM (vs. MSRP).  We say that because of SIP's properties compared to the needs/properties of voice or IM or whatever.  I assume we all agree on that.

MSRP also has properties.  Some of them frankly aren't very good for bulk file transfer, IMHO.  One of those "properties" is it doesn't seem to be getting deployed UA-UA.  It's getting deployed UA-AS-AS-UA, where "AS" is an app server or SBC or both either acting as an MSRP-relay or MSRP-b2bua.  (it shouldn't be a surprise this is happening - the MSRP protocol leaves no other choice)

I don't think it's a good property that a bulk file transfer gets sent through a chain of app servers.  I don't think it's a good property that camera controls get sent through a chain of app servers.  My 2 cents anyway.

-hadriel

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