Toward the PSTN/Internet Inter-Networking--Pre-PINT Implementations
RFC 2458

Document Type RFC - Informational (November 1998; No errata)
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Netowrk Working Group                                               H. Lu
Request for Comments: 2458                                         Editor
Category: Informational                                   M. Krishnaswamy
                                                      Lucent Technologies
                                                                L. Conroy
                                                      Roke Manor Research
                                                              S. Bellovin
                                                                  F. Burg
                                                              A. DeSimone
                                                                K. Tewani
                                                                AT&T Labs
                                                              P. Davidson
                                                                   Nortel
                                                           H. Schulzrinne
                                                      Columbia University
                                                          K. Vishwanathan
                                                                Isochrome
                                                            November 1998

               Toward the PSTN/Internet Inter-Networking
                       --Pre-PINT Implementations

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 (1998).  All Rights Reserved.

Abstract

   This document contains the information relevant to the development of
   the inter-networking interfaces underway in the Public Switched
   Telephone Network (PSTN)/Internet Inter-Networking (PINT) Working
   Group. It addresses technologies, architectures, and several (but by
   no means all) existing pre-PINT implementations of the arrangements
   through which Internet applications can request and enrich PSTN
   telecommunications services. The common denominator of the enriched
   services (a.k.a. PINT services) is that they combine the Internet and
   PSTN services in such a way that the Internet is used for non-voice
   interactions, while the voice (and fax) are carried entirely over the
   PSTN. One key observation is that the pre-PINT implementations, being
   developed independently, do not inter-operate. It is a task of the
   PINT Working Group to define the inter-networking interfaces that

Lu, et. al.                  Informational                      [Page 1]
RFC 2458                Pre-PINT Implementations           November 1998

   will support inter-operation of the future implementations of PINT
   services.

Table of Contents

   1.      Introduction    .......................................     3
   2.      Terminology     .......................................     3
   3.      PINT Services   .......................................     4
   4.      Architectural Overview  ...............................     5
   4.1     Public Switched Telephone Network       ...............     5
   4.2     Pre-PINT Systems        ...............................     9
   5.      IN-Based Solutions      ...............................    20
   5.1     The Lucent System       ...............................    20
   5.1.1   Roles of the Web Server, Service Node, and SMS  .......    20
   5.1.2   A Click-to-Dial-Back Service Scenario   ...............    21
   5.1.3   Web Server-Service Node Interface       ...............    22
   5.1.4   Web Server-SMS Interface and SNMP MIB   ...............    24
   5.1.5   Security Considerations     ...........................    26
   5.2     Siemens Web Call Center     ...........................    27
   5.2.1   Service Description     ...............................    27
   5.2.2   Implementation      ...................................    29
   5.2.3   Derived Requirements/Lessons      .....................    35
   6.      Alternative Solutions   ...............................    37
   6.1     The AT&T System   .....................................    37
   6.1.1   High Level Architecture    ............................    38
   6.1.2   IP Client to CallBroker Interface    ..................    39
   6.1.3   Protocol    ...........................................    40
   6.1.4   APIs Exposed to the IP Client     .....................    41
   6.1.5   Voice-Bridge Control API       ........................    41
   6.2     Simple Computer Telephony Protocol      ...............    41
   6.2.1   Overview    ...........................................    41
   6.2.2   How SCTP Fits in with the Reference PINT Services    ..    42
   7.      Session Initiation Protocol--An Emerging Standard    ..    43
   7.1     Overview        .......................................    43
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