Subject: RE: [Sipping] Stimulus Signaling/Markup between complex SIP UAs and apps?

From: "Eric Burger" <[email-masked]>
Date: Fri, 6 Dec 2002 15:11:14 -0500

inline.

> -----Original Message----- From: Jain, Rajnish (Rajnish) [mailto:[email-masked]]
> 
> The Application Interaction Framework draft talks about stimulus
> signaling as a way for SIP UAs to interact w/ SIP applications.
> The draft suggests use of markup languages to allow applications 
> to manage local/remote user interfaces on SIP UAs. 
> 
> While the draft exemplifies a UA's stimulus/markup interaction w/ 
> a pre-paid application server, it is not very clear to us if the
> caller UA (instead of a subscriber end-point) can be a complex UA 
> such as the following:
> 
> - SIP (enabled) Gateway

Why not?  It does SIP.  It may do tone detection.

> - PSTN Switch w/ SIP-T interface

Why not?  It does SIP.  It may do tone detection.

> and does the draft recommend stimulus/markup signaling between 
> such complex/concentrated UAs (or apps) and SIP applications ?

The draft is silent on it.  If you manufacture media rich gateways, you might say "of course".  If you manufacture media servers, you might say "you could if you wanted, but you would be better served if you didn't."  :-)

> In other words, does the stimulus signaling apply to following
> scenarios ?:
> 
> 1. The pre-paid caller is connected to a PSTN switch that has 
> a SIP-T interface to the pre-paid application. 

Yes, so long as the PSTN switch is SIP-aware, able to parse and execute KPML, and report using SIP (or, yuck, http).

Do you know of such a switch?
 
> 2. The pre-paid caller is connected to a PBX (SIP Gateway) over 
> an ISDN i/f, which in turn is connected to the pre-paid app. 
> over normal SIP.

Same issues as for the PSTN switch.

> If yes, would the terms client-local and client-remote still be
> accurate, as the user here is a POTS/ISDN user? From the user's
> perspective, the UI would be client-remote. But from application's
> perspective the UI would be client-local (as the UI will be on the 
> PBX or PSTN switch both of which look like a UA to app server).

It is still client-local, as the gateway/switch/PBX is a local proxy for the user.  If you used a media server in the IP network behind the gateway/switch/PBX to execute the KPML, then you would be cline-remote.
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