A Framework for Application Interaction in the Session Initiation Protocol (SIP)
RFC 5629

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Network Working Group                                       J. Rosenberg
Request for Comments: 5629                                 Cisco Systems
Category: Standards Track                                   October 2009

                A Framework for Application Interaction
                in the Session Initiation Protocol (SIP)

Abstract

   This document describes a framework for the interaction between users
   and Session Initiation Protocol (SIP) based applications.  By
   interacting with applications, users can guide the way in which they
   operate.  The focus of this framework is stimulus signaling, which
   allows a user agent (UA) to interact with an application without
   knowledge of the semantics of that application.  Stimulus signaling
   can occur to a user interface running locally with the client, or to
   a remote user interface, through media streams.  Stimulus signaling
   encompasses a wide range of mechanisms, ranging from clicking on
   hyperlinks, to pressing buttons, to traditional Dual-Tone Multi-
   Frequency (DTMF) input.  In all cases, stimulus signaling is
   supported through the use of markup languages, which play a key role
   in this framework.

Status of This Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (c) 2009 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the BSD License.

Rosenberg                   Standards Track                     [Page 1]
RFC 5629               App Interaction Framework            October 2009

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow

   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Rosenberg                   Standards Track                     [Page 2]
RFC 5629               App Interaction Framework            October 2009

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  Conventions Used in This Document  . . . . . . . . . . . . . .  4
   3.  Definitions  . . . . . . . . . . . . . . . . . . . . . . . . .  4
   4.  A Model for Application Interaction  . . . . . . . . . . . . .  7
     4.1.  Functional vs. Stimulus  . . . . . . . . . . . . . . . . .  9
     4.2.  Real-Time vs. Non-Real-Time  . . . . . . . . . . . . . . . 10
     4.3.  Client-Local vs. Client-Remote . . . . . . . . . . . . . . 10
     4.4.  Presentation-Capable vs. Presentation-Free . . . . . . . . 11
   5.  Interaction Scenarios on Telephones  . . . . . . . . . . . . . 11
     5.1.  Client Remote  . . . . . . . . . . . . . . . . . . . . . . 12
     5.2.  Client Local . . . . . . . . . . . . . . . . . . . . . . . 12
     5.3.  Flip-Flop  . . . . . . . . . . . . . . . . . . . . . . . . 13
   6.  Framework Overview . . . . . . . . . . . . . . . . . . . . . . 13
   7.  Deployment Topologies  . . . . . . . . . . . . . . . . . . . . 16
     7.1.  Third-Party Application  . . . . . . . . . . . . . . . . . 16
     7.2.  Co-Resident Application  . . . . . . . . . . . . . . . . . 17
     7.3.  Third-Party Application and User Device Proxy  . . . . . . 18
     7.4.  Proxy Application  . . . . . . . . . . . . . . . . . . . . 19
   8.  Application Behavior . . . . . . . . . . . . . . . . . . . . . 19
     8.1.  Client-Local Interfaces  . . . . . . . . . . . . . . . . . 20
       8.1.1.  Discovering Capabilities . . . . . . . . . . . . . . . 20
       8.1.2.  Pushing an Initial Interface Component . . . . . . . . 20
       8.1.3.  Updating an Interface Component  . . . . . . . . . . . 22