The SPIRITS (Services in PSTN requesting Internet Services) Protocol
RFC 3910

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Network Working Group                                    V. Gurbani, Ed.
Request for Comments: 3910                                A. Brusilovsky
Category: Standards Track                                    I. Faynberg
                                               Lucent Technologies, Inc.
                                                                 J. Gato
                                                         Vodafone Espana
                                                                   H. Lu
                                           Bell Labs/Lucent Technologies
                                                             M. Unmehopa
                                               Lucent Technologies, Inc.
                                                            October 2004

  The SPIRITS (Services in PSTN requesting Internet Services) Protocol

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) The Internet Society (2004).

Abstract

   This document describes the Services in PSTN (Public Switched
   Telephone Network) requesting Internet Services (SPIRITS) protocol.
   The purpose of the SPIRITS protocol is to support services that
   originate in the cellular or wireline PSTN and necessitate
   interactions between the PSTN and the Internet.  On the PSTN side,
   the SPIRITS services are most often initiated from the Intelligent
   Network (IN) entities.  Internet Call Waiting and Internet Caller-ID
   Delivery are examples of SPIRITS services, as are location-based
   services on the cellular network.  The protocol defines the building
   blocks from which many other services can be built.

Table of Contents

   1.   Introduction  . . . . . . . . . . . . . . . . . . . . . . . .  3
        1.1.   Conventions used in this document. . . . . . . . . . .  3
   2.   Overview of operations. . . . . . . . . . . . . . . . . . . .  3
        2.1.   Terminology. . . . . . . . . . . . . . . . . . . . . .  6
   3.   Using XML for subscription and notification . . . . . . . . .  7
   4.   XML format definition . . . . . . . . . . . . . . . . . . . .  8

Gurbani, et al.             Standards Track                     [Page 1]
RFC 3910                    SPIRITS Protocol                October 2004

   5.   Call-related events . . . . . . . . . . . . . . . . . . . . . 10
        5.1.   IN-specific requirements . . . . . . . . . . . . . . . 11
        5.2.   Detection points and required parameters . . . . . . . 12
               5.2.1.   Originating-side DPs. . . . . . . . . . . . . 12
               5.2.2.   Terminating-side DPs. . . . . . . . . . . . . 14
        5.3.   Services through dynamic DPs . . . . . . . . . . . . . 15
               5.3.1.   Normative usage . . . . . . . . . . . . . . . 15
               5.3.2.   Event package name. . . . . . . . . . . . . . 16
               5.3.3.   Event package parameters. . . . . . . . . . . 16
               5.3.4.   SUBSCRIBE bodies. . . . . . . . . . . . . . . 16
               5.3.5.   Subscription duration . . . . . . . . . . . . 17
               5.3.6.   NOTIFY bodies . . . . . . . . . . . . . . . . 17
               5.3.7.   Notifier processing of SUBSCRIBE requests . . 18
               5.3.8.   Notifier generation of NOTIFY requests. . . . 18
               5.3.9.   Subscriber processing of NOTIFY requests. . . 19
               5.3.10.  Handling of forked requests . . . . . . . . . 19
               5.3.11.  Rate of notifications . . . . . . . . . . . . 19
               5.3.12.  State Agents. . . . . . . . . . . . . . . . . 20
               5.3.13.  Examples. . . . . . . . . . . . . . . . . . . 20
               5.3.14.  Use of URIs to retrieve state . . . . . . . . 25
        5.4.   Services through static DPs. . . . . . . . . . . . . . 25
               5.4.1.   Internet Call Waiting . . . . . . . . . . . . 26
               5.4.2.   Call disposition choices. . . . . . . . . . . 26
               5.4.3.   Accepting an ICW session using VoIP . . . . . 28
   6.   Non-call related events . . . . . . . . . . . . . . . . . . . 29
        6.1.   Non-call events and their required parameters. . . . . 29
        6.2.   Normative usage. . . . . . . . . . . . . . . . . . . . 30
        6.3.   Event package name . . . . . . . . . . . . . . . . . . 30
        6.4.   Event package parameters . . . . . . . . . . . . . . . 31
        6.5.   SUBSCRIBE bodies . . . . . . . . . . . . . . . . . . . 31
        6.6.   Subscription duration. . . . . . . . . . . . . . . . . 31
        6.7.   NOTIFY bodies. . . . . . . . . . . . . . . . . . . . . 32
        6.8.   Notifier processing of SUBSCRIBE requests. . . . . . . 32