Re: [splices] SIP INVOKE method

"Parthasarathi R (partr)" <partr@cisco.com> Wed, 18 May 2011 13:06 UTC

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Date: Wed, 18 May 2011 18:36:39 +0530
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Thread-Topic: [splices] SIP INVOKE method
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From: "Parthasarathi R (partr)" <partr@cisco.com>
To: "Shekh-Yusef, Rifaat (Rifaat)" <rifatyu@avaya.com>, splices@ietf.org
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Subject: Re: [splices] SIP INVOKE method
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Rifaat,

Thanks for the clarification. Please include the text in the next revision to show how multiple simultaneous INVOKE operation happens within the dialog & abort opertion parameter in action URN.

Thanks
Partha 

-----Original Message-----
From: Shekh-Yusef, Rifaat (Rifaat) [mailto:rifatyu@avaya.com] 
Sent: Wednesday, May 18, 2011 6:25 PM
To: Parthasarathi R (partr); splices@ietf.org
Subject: RE: [splices] SIP INVOKE method

Inline...

> -----Original Message-----
> From: Parthasarathi R (partr) [mailto:partr@cisco.com]
> Sent: Wednesday, May 18, 2011 8:27 AM
> To: Shekh-Yusef, Rifaat (Rifaat); splices@ietf.org
> Subject: RE: [splices] SIP INVOKE method
> 
> Rifaat,
> 
> SUBSCRIBE creates the dialog and within the created subscribe based 
> dialog, INVOKE method (transaction) is sent from subscriber to perform 
> the specific action based on the mentioned URN. Please correct me in 
> case I misunderstand your proposal.
> 
Yes, that is correct.

> Please read inline
> 
> Thanks
> Partha
> 
> -----Original Message-----
> From: Shekh-Yusef, Rifaat (Rifaat) [mailto:rifatyu@avaya.com]
> Sent: Wednesday, May 18, 2011 5:07 PM
> To: Parthasarathi R (partr); splices@ietf.org
> Subject: RE: [splices] SIP INVOKE method
> 
> Inline...
> 
> > -----Original Message-----
> > From: Parthasarathi R (partr) [mailto:partr@cisco.com]
> > Sent: Tuesday, May 17, 2011 2:57 PM
> > To: Shekh-Yusef, Rifaat (Rifaat); splices@ietf.org
> > Subject: RE: [splices] SIP INVOKE method
> >
> > Rifaat,
> >
> > I skimmed through your draft. I like the idea of controlling remote 
> > UA action using new method (INVOKE). Few comments in the draft:
> >
> > 1) Sec 4.1: SUBSCRIBE with expire=0 is used to terminate INVOKE 
> > dialog by INVOKE-Issuer. Whether it is ok to "INVOKE with expire=0" 
> > terminate INVOKE dialog as it avoids the dependency on SUBSCRIBE message to terminate.
> >
> The new plan is to remove the implicit subscription.
> 
> <Partha> How is it possible for INVOKE-Issuer to abort or stop the 
> action in case required? </Partha>
> 
One possible way is to define a parameter to the URN and then resend the INVOKE request.
For example, urn:invoke:whatever;abort

> 
> > 2) I foresee the complexity in creating explicit subscription 
> > because two dialog creation methods (INVOKE & SUBSCRIBE) are used to 
> > make the single action. It will be good in case INVOKE acts similar 
> > to INVITE (Dialog creation & Action). INVITE has the implicit action 
> > like "ring the phone" or "auto- answer" whereas INVOKE has 
> > explicitly mention the action to be done in INVOKE- recipient.
> >
> I am not sure that I understand your comment, but with the new plan 
> the INVOKE will NOT create a dialog.
> 
> 
> > 3) Do you foresee INVOKE dialog creation which change the action 
> > within INVOKE dialog. For example: Following three actions using 
> > single INVOKE dialog creation but updating the action based on the
> application information..
> >
> >      Action 1:  Create the call
> >      Action 2:  Hold the call
> >      Action 3:  Terminate the call
> >
> In this case, I expect the INVOKE-Issuer to first create a 
> subscription and then to send the INVOKE requests in the context of that dialog.
> 
> <Partha>
> In case INVOKE is mid-dialog transaction within SUBSCRIBE dialog, then 
> whether multiple simultaneous INVOKE operation is allowed or not. Example
>               1) INVOKE hold action
>               2) Even before INVOKE hold completion NOTIFY receives, 
> INVOKE terminate call action
> 
> </Partha>
> 
Yes, that should be possible.

> > Thanks
> > Partha
> >
> > ________________________________________
> > From: splices-bounces@ietf.org [mailto:splices-bounces@ietf.org] On 
> > Behalf Of Shekh-Yusef, Rifaat (Rifaat)
> > Sent: Tuesday, May 17, 2011 10:57 PM
> > To: Shekh-Yusef, Rifaat (Rifaat); splices@ietf.org
> > Subject: Re: [splices] SIP INVOKE method Thank you all for your 
> > quick review and feedback so far.
> > I will work on a new version of the draft that removes the implicit 
> > subscription.
> >
> > Please, let me know if you have any other comments beside the 
> > implicit subscription issue.
> >
> > Regards,
> > Rifaat
> >
> >
> > From: splices-bounces@ietf.org [mailto:splices-bounces@ietf.org] On 
> > Behalf Of Shekh-Yusef, Rifaat (Rifaat)
> > Sent: Tuesday, May 17, 2011 9:15 AM
> > To: splices@ietf.org
> > Subject: [splices] SIP INVOKE method
> >
> > Hi,
> >
> > As discussed in the last SPLICES WG meeting in Prague, the REFER 
> > method is overloaded and has limitations that prevents it from being 
> > the ideal method for action invocation.
> > We have worked on the following new draft that defines a new SIP 
> > method to be used for invoking actions:
> > https://datatracker.ietf.org/doc/draft-yusef-splices-invoke/
> >
> > We would appreciate it if people review the document and provide us 
> > with their feedback.
> >
> > Regards,
> > Rifaat
> >
> >
> >
> >
> >