Re: [dispatch] SIP Action Referral

On 1/14/2011 1:41 PM, Shekh-Yusef, Rifaat (Rifaat) wrote:
> Hi,
>
> We have submitted the following SIP Action Referral draft to the IETF and we would like to discuss it during the upcoming DISPATCH meeting in IETF80.
> https://datatracker.ietf.org/doc/draft-yusef-dispatch-action-ref/
> A charter proposal will follow by the end of next week.
>
> We would appreciate any comments or feedback on this draft.

This seems pretty interesting.

Some of it seems relatively reasonable and straightforward.

I am a little concerned that the space of actions that might be 
controlled in this way is largely unbounded - the beginning of an 
enumeration of telephony features. But maybe not.

A couple of pieces seem to be addons/afterthoughts that aren't well 
integrated:

3.2.  Loosely Coupled UAs
3.3.2.  Answer an A/V call on two separate devices

I note that the function used in 3.3.2 is not mentioned in the 
enumeration of actions included in section 4.2.

This feature seems to raise more questions than it answers. 
Specifically, a one time delivery of audio answer SDP from the phone to 
the PC hardly seems like enough to make this work. What would happen on 
subsequent reinvite-o/a interactions between bob and alice? How long 
should the phone keep the audio active, in the absence of a real 
signaling session to control it? I suppose that the PC can send 
additional REFERs to the phone, but then there will be no dialog to 
refer to.

Maybe this could be developed, but there is a lot more to say to make 
this work. But ISTM when this is worked out there will have to be a sip 
dialog with the phone, perhaps from the PC.

	Thanks,
	Paul

> Thanks,
>   Rifaat
>
>
> -----Original Message-----
> From: IETF I-D Submission Tool [mailto:idsubmission@ietf.org]
> Sent: Friday, January 14, 2011 8:15 AM
> To: Shekh-Yusef, Rifaat (Rifaat)
> Cc: fluffy@cisco.com; alan.b.johnston@gmail.com; francois.audet@skype.net
> Subject: New Version Notification for draft-yusef-dispatch-action-ref-00
>
>
> A new version of I-D, draft-yusef-dispatch-action-ref-00.txt has been successfully submitted by Rifaat Shekh-Yusef and posted to the IETF repository.
>
> Filename:	 draft-yusef-dispatch-action-ref
> Revision:	 00
> Title:		 Action Referral in the Session Initiation Protocol (SIP)
> Creation_date:	 2011-01-14
> WG ID:		 Independent Submission
> Number_of_pages: 24
>
> Abstract:
> This specification defines action referral that allows an application
> to make a high level request to a User Agent to perform an action,
> and let the the User Agent execute the action as it sees fit. Action
> referral uses the SIP REFER method with a Refer-To header field
> containing a URN, which indicates the requested action.
>
> This specification also defines the option tag 'action-ref' to allow
> the UA to indicate its support for action referral.
>
>
>
> The IETF Secretariat.
>
>
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