Pre-Spirits Implementations of PSTN-initiated Services
RFC 2995

Document Type RFC - Informational (November 2000; No errata)
Last updated 2013-03-02
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Network Working Group                                      H. Lu, Editor
Request for Comments: 2995                                   I. Faynberg
Category: Informational                                       J. Voelker
                                                             M. Weissman
                                                                W. Zhang
                                                     Lucent Technologies
                                                                 S. Rhim
                                                                J. Hwang
                                                           Korea Telecom
                                                                  S. Ago
                                                           S. Moeenuddin
                                                              S. Hadvani
                                                                     NEC
                                                           S. Nyckelgard
                                                                   Telia
                                                               J. Yoakum
                                                               L. Robart
                                                         Nortel Networks
                                                           November 2000

         Pre-SPIRITS Implementations of PSTN-initiated Services

Status of this Memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard of any kind.  Distribution of this
   memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2000).  All Rights Reserved.

Abstract

   This document contains information relevant to the work underway in
   The Services in the PSTN/IN Requesting InTernet Services (SPIRITS)
   Working Group.  It describes four existing implementations of
   SPIRITS-like services from Korea Telecom, Lucent Technologies, NEC,
   and Telia in cooperation with Nortel Networks.  SPIRITS-like services
   are those originating in the Public Switched Telephone Network (PSTN)
   and necessitating the interactions of the Internet and PSTN.

Lu, et al.                   Informational                      [Page 1]
RFC 2995              Pre-SPIRITS Implementations          November 2000

   Surveying the implementations, we can make the following
   observations:

      o  The ICW service plays the role of a benchmark service.  All
         four implementations can support ICW, with three specifically
         designed for it.

      o  Session Initiation Protocol (SIP) is used in most of the
         implementations as the base communications protocol between the
         PSTN and Internet.  (NEC's implementation is the only exception
         that uses a proprietary protocol.  Nevertheless, NEC has a plan
         to support SIP together with the extensions for SPIRITS
         services.)

      o  All implementations use IN-based solutions for the PSTN part.

   It is clear that not all pre-SPIRITS implementations inter-operate
   with each other.  It is also clear that not all SIP-based
   implementations inter-operate with each other given that they do not
   support the same version of SIP.  It is a task of the SPIRITS Working
   Group to define the inter-networking interfaces that will support
   interoperation of the future implementations of SPIRITS services.

Table of Contents

   1. Introduction ................................................  3
   2. Service Description of Internet Call Waiting ................  4
   3. Korea Telecom's ICW Implementation ..........................  5
   3.1. Overview ..................................................  5
   3.2. Network Architecture ......................................  6
   3.3. Network Entities ..........................................  7
   3.3.1. SSP .....................................................  7
   3.3.2. SCP .....................................................  7
   3.3.3. IP ......................................................  7
   3.3.4. ICW Server System .......................................  7
   3.3.5. ICW Client System .......................................  8
   3.3.6. Firewall ................................................  9
   3.4. Network Interfaces ........................................  9
   3.5. Protocols .................................................  9
   3.5.1. Intelligent Network Application Part Protocol (INAP) ....  9
   3.5.2. PINT Protocol ...........................................  9
   3.6.  Example Scenarios ........................................ 11
   3.6.1. ICW Service Subscription ................................ 11
   3.6.2. ICW Client Installation ................................. 11
   3.6.3. ICW Service Activation .................................. 12
   3.6.4. Incoming Call Notification .............................. 14
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