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Interworking between the Session Initiation Protocol (SIP) and QSIG
RFC 4497

Network Working Group                                          J. Elwell
Request for Comments: 4497                                       Siemens
BCP: 117                                                        F. Derks
Category: Best Current Practice                              NEC Philips
                                                               P. Mourot
                                                             O. Rousseau
                                                                 Alcatel
                                                                May 2006

  Interworking between the Session Initiation Protocol (SIP) and QSIG

Status of This Memo

   This document specifies an Internet Best Current Practices for the
   Internet Community, and requests discussion and suggestions for
   improvements.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2006).

Abstract

   This document specifies interworking between the Session Initiation
   Protocol (SIP) and QSIG within corporate telecommunication networks
   (also known as enterprise networks).  SIP is an Internet
   application-layer control (signalling) protocol for creating,
   modifying, and terminating sessions with one or more participants.
   These sessions include, in particular, telephone calls.  QSIG is a
   signalling protocol for creating, modifying, and terminating
   circuit-switched calls (in particular, telephone calls) within
   Private Integrated Services Networks (PISNs).  QSIG is specified in a
   number of Ecma Standards and published also as ISO/IEC standards.

Elwell, et al.           Best Current Practice                  [Page 1]
RFC 4497           Interworking between SIP and QSIG            May 2006

Table of Contents

   1. Introduction ....................................................4
   2. Terminology .....................................................5
   3. Definitions .....................................................5
      3.1. External Definitions .......................................5
      3.2. Other definitions ..........................................5
           3.2.1. Corporate Telecommunication Network (CN) ............5
           3.2.2. Gateway .............................................6
           3.2.3. IP Network ..........................................6
           3.2.4. Media Stream ........................................6
           3.2.5. Private Integrated Services Network (PISN) ..........6
           3.2.6. Private Integrated Services Network Exchange
                  (PINX) ..............................................6
   4. Acronyms ........................................................6
   5. Background and Architecture .....................................7
   6. Overview .......................................................10
   7. General Requirements ...........................................11
   8. Message Mapping Requirements ...................................12
      8.1. Message Validation and Handling of Protocol Errors ........12
      8.2. Call Establishment from QSIG to SIP .......................14
           8.2.1. Call Establishment from QSIG to SIP Using
                  En Bloc Procedures .................................14
           8.2.2. Call Establishment from QSIG to SIP Using
                  Overlap Procedures .................................16
      8.3. Call Establishment from SIP to QSIG .......................20
           8.3.1. Receipt of SIP INVITE Request for a New Call .......20
           8.3.2. Receipt of QSIG CALL PROCEEDING Message ............21
           8.3.3. Receipt of QSIG PROGRESS Message ...................22
           8.3.4. Receipt of QSIG ALERTING Message ...................22
           8.3.5. Inclusion of SDP Information in a SIP 18x
                  Provisional Response ...............................23
           8.3.6. Receipt of QSIG CONNECT Message ....................24
           8.3.7. Receipt of SIP PRACK Request .......................25
           8.3.8. Receipt of SIP ACK Request .........................25
           8.3.9. Receipt of a SIP INVITE Request for a Call
                  Already Being ......................................25
      8.4. Call Clearing and Call Failure ............................26
           8.4.1. Receipt of a QSIG DISCONNECT, RELEASE, or
                  RELEASE COMPLETE ...................................26
           8.4.2. Receipt of a SIP BYE Request .......................29
           8.4.3. Receipt of a SIP CANCEL Request ....................29
           8.4.4. Receipt of a SIP 4xx-6xx Response to an
                  INVITE Request .....................................29
           8.4.5. Gateway-Initiated Call Clearing ....................32
      8.5. Request to Change Media Characteristics ...................32

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