ISO/IEC INTERNATIONAL STANDARD 23916 First edition 2005-11-01 Information technology - Telecommunications and information exchange between systems - Corporate Telecommunication Networks Signalling Interworking between QSIG and SIP -Call Transfer Technologies del'information- Telecommunications etechange d'information entre systemes-Reseaux detelecommunications d'entreprise-InteractiondesignalisationentreQSiGetSiP Transfert d'appel Reference number ISO/IEC 23916:2005(E) IEC ISO @ISO/IEC 2005 IS0/IEC 23916:2005(E) PDFdisclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IsO member bodies. In ?ISO/IEC2005 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, ISO's member body in the country of the requester. ISO copyright office Case postale 56:CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org ii ISO/IEC2005-Allrightsreserved IS0/IEC 23916:2005(E) Contents Page Foreword. Introduction. .vi 1 Scope.. 2 Normative references.. 3 Terminology 2 4 Definitions 4.1 External definitions.. 4.2 Other definitions. 3 4.2.1 UserA 4.2.2 User B 4.2.3 UserC 4.2.4 4.2.5 Single step call transfer ... 4.2.6 Call transfer by join ... 4.2.7 Call transfer by rerouteing.... 4.2.8 Corporate telecommunication Network (CN). 4.2.9 IP network .... 4.2.10 Private Integrated Services Network (PISN) 4.2.11 Private Integrated services Network eXchange (PINX) 5 Abbreviations and acronyms. 6 Background and architecture 7 Procedures. 7.1 Call transfers in QSIG 5 7.2 CalltransferinSiP.. 7.3 Scope of the interworking functions... 6 7.3.1 .6 7.3.2 SIP side..... .6 7.3.3 Discussion over transfer interworking functions . .6 7.4 Mapping of numbers and URls ... .9 7.5 10 7.5.1 Receipt of a FACILITY message with callTransferComplete invoke APDU.... 7.5.2 Receipt of a FACILITY message with callTransferUpdate invoke APDU.. 10 7.5.3 Receipt of a FACILITY message with ssctlnitiate invoke APDU.... 10 7.5.4 Receipt of a SETUP message with ssctSetup invoke APDU.... 11 7.5.5 Receipt of a FACILITY message with subaddressTransfer invoke APDU 12 7.6 UAs Processing. 12 7.6.1 Receipt of a SIP REFER request. 12 7.6.2 Receipt of a SIPINVITE request.... 7.6.3 Receipt of a SiP request with revised identity. 18 8 Example message sequences... 19 8.1 Call transfer by join where User B and C are SiP participants .. .19 8.2 Call transfer where User A is a SiP participant..... .20 8.3 Call transfer where User A is a SiP participant and where two gatewaysare used ... 21 8.4 Call transfer where User A and User B are SP participants..... 22 8.5 Single step call transfer where User B is a SiP participant.... 23 8.6 Unsuccessful Single step call transfer where User A and User C areSiP participants. 8.7 Single step call transfer where User A and User B are SiP participants .. .25 9 Security considerations.. 25 @ISO/IEC 2005 - All rights reserved ili IS0/IEC23916:2005(E) Foreword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate in the development of International Standards through technical committees established by the liaison with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEC have establisheda joint