ISO_IEC_TR_16167_2011.pdf

Reference numberISO/IEC TR 16167:2011(E)ISO/IEC 2011 TECHNICAL REPORT ISO/IECTR16167Second edition2011-09-01 Information technology Telecommunications and information exchange between systems Next Generation Corporate Networks(NGCN)Emergency calls Technologies de linformation Tlinformatique Rseaux dentreprise de prochaine gnration(NGCN)Appels durgence ISO/IEC TR 16167:2011(E)COPYRIGHT PROTECTED DOCUMENT ISO/IEC 2011 All rights reserved.Unless otherwise specified,no part of this publication may be reproduced or utilized in any form or by any means,electronic or mechanical,including photocopying and microfilm,without permission in writing from either ISO at the address below or ISOs 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 copyrightiso.org Web www.iso.org Published in Switzerland ii ISO/IEC 2011 All rights reserved ISO/IEC TR 16167:2011(E)ISO/IEC 2011 All rights reserved iii Contents Page Foreword.ivIntroduction.v1Scope.12Normative references.23Terms and definitions.23.1External definitions.23.2Other definitions.24Abbreviations.35Background.56Technical aspects of emergency calls in enterprise networks.86.1Identifying a call as an emergency call.86.1.1User actions.86.1.2Signalling impact.106.1.3Unauthenticated access.126.2Obtaining and delivering the location of the caller.126.2.1Format of location information.136.2.2Obtaining location information for delivery.136.2.3Location conveyance in SIP.186.3Routing an emergency call to the appropriate SAP.186.3.1Routing by the calling device.196.3.2Routing by enterprise SIP intermediary.206.4Delivering information to the SAP to allow a return call or verification call to be made.216.4.1Delivery of caller identification.216.4.2Delivery of device identification.216.4.3Identifying a return call or verification call.226.5Ensuring appropriate resources are available for an emergency call,return call or verification call.226.6Ensuring appropriate media quality during an emergency call.236.7Security considerations.246.8Other aspects.256.8.1Hosted users.256.8.2Guest users.257NGN considerations.258Device considerations.279Alternatives for roaming mobile and nomadic users.289.1Establishing an emergency call when already signalling via a visited public network.289.2Establishing an emergency call via a visited public network when other traffic is signalled directly via the enterprise network.299.3Establishing an emergency call directly to a PSAP.2910Enterprise responsibilities.2911Summary of requirements and standardisation gaps.3011.1Requirements on NGNs.3011.2Recommendations on enterprise networks.3011.3Standardisation gaps.31Bibliography.32 ISO/IEC TR 16167:2011(E)iv ISO/IEC 2011 All rights reserved 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 respective organization to deal with particular fields of technical activity.ISO and IEC technical committees collaborate in fields of mutual interest.Other international organizations,governmental and non-governmental,in liaison with ISO and IEC,also take part in the work.In the field of information technology,ISO and IEC have established a joint technical committee,ISO/IEC JTC 1.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives,Part 2.The main task of the joint technical committee is to prepare International Standards.Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting.Publication as an International Standard requires approval by at least 75%of the national bodies casting a vote.In exceptional circumstances,when the joint technical committee has collected data of a different kind from that which is normally published as an International Standard(“state of the art”,for example),it may decide to publish a Technical Report.A Technical Report is entirely informative in nature and shall be subject to review every five years in the same manner as an International Standard.Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights.ISO and IEC shall not be held responsible for identifying any or all such patent rights.ISO/IEC TR 16167 was prepared by Ecma International(as ECMA TR/101)and was adopted,under a special“fast-track procedure”,by Joint Technical Committee ISO/IEC JTC 1,Information technology,in parallel with its approval by national bodies of ISO and IEC.This second edition cancels and replaces the first edition(ISO/IEC TR 16167:2010),which has been technically revised.This second edition makes a distinction between an answering point and an emergency control centre and clarifies a fe