1、 ETSI TS 123 226 V15.0.0 (2018-06) Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; Global text telephony (GTT); Stage 2 (3GPP TS 23.226 version 15.0.0 Release 15) TECHNICAL SPECIFICATION ETSI ETSI TS 123 226 V15.0.0 (2018-06)13GPP
2、TS 23.226 version 15.0.0 Release 15Reference RTS/TSGS-0223226vf00 Keywords GSM,LTE,UMTS ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture d
3、e Grasse (06) N 7803/88 Important notice The present document can be downloaded from: http:/www.etsi.org/standards-search The present document may be made available in electronic versions and/or in print. The content of any electronic and/or print versions of the present document shall not be modifi
4、ed without the prior written authorization of ETSI. In case of any existing or perceived difference in contents between such versions and/or in print, the only prevailing document is the print of the Portable Document Format (PDF) version kept on a specific network drive within ETSI Secretariat. Use
5、rs of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other ETSI documents is available at https:/portal.etsi.org/TB/ETSIDeliverableStatus.aspx If you find errors in the present document, please send
6、 your comment to one of the following services: https:/portal.etsi.org/People/CommiteeSupportStaff.aspx Copyright Notification No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm except as authorized by written permission
7、of ETSI. The content of the PDF version shall not be modified without the written authorization of ETSI. The copyright and the foregoing restriction extend to reproduction in all media. ETSI 2018. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are trademarks of ETSI registered for
8、 the benefit of its Members. 3GPPTM and LTETMare trademarks of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. oneM2M logo is protected for the benefit of its Members. GSMand the GSM logo are trademarks registered and owned by the GSM Association. ETSI ETSI TS
9、 123 226 V15.0.0 (2018-06)23GPP TS 23.226 version 15.0.0 Release 15Intellectual Property Rights Essential patents IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ET
10、SI members and non-members, and can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (https:/i
11、pr.etsi.org/). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential
12、 to the present document. Trademarks The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners. ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no right to use or reproduce any tr
13、ademark and/or tradename. Mention of those trademarks in the present document does not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks. Foreword This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3
14、GPP). The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or GSM identities. These should be interpreted as being references to the corresponding ETSI deliverables. The cross reference between GSM, UMTS, 3GPP and ETSI identities can be f
15、ound under http:/webapp.etsi.org/key/queryform.asp. Modal verbs terminology In the present document “shall“, “shall not“, “should“, “should not“, “may“, “need not“, “will“, “will not“, “can“ and “cannot“ are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for th
16、e expression of provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TS 123 226 V15.0.0 (2018-06)33GPP TS 23.226 version 15.0.0 Release 15Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 5g3
17、Introduction 5g31 Scope 6g32 References 6g33 Definitions and abbreviations . 7g33.1 Definitions 7g33.2 Abbreviations . 7g34 General Functions 8g34.1 Overview 8g34.1.1 General text transmission functions 8g34.1.2 Functions 9g34.1.2.1 Call Control and text media initiation . 9g34.1.2.2 Presentation co
18、ding . 9g34.1.2.3 Transport and transmission host environments . 9g34.1.2.4 Multiplexing 9g34.1.2.5 Conversion 9g34.1.2.6 Text capable terminal 10g34.1.2.7 Routing and location of CTM detection/conversion functions . 10g34.1.3 Emergency service considerations 10g35 Considerations for each host envir
19、onment . 10g35.1 GTT-IP: IP Multimedia 10g35.1.0 GTT-IP 10g35.1.1 Interworking between Real-Time Text and PSTN Text Telephony . 11g35.1.2 Emergency call considerations for GTT-IP 11g35.2 GTT-CS: Circuit switched Multimedia 11g35.3 GTT-Voice: Circuit switched voice channel 12g35.3.1 Interworking betw
20、een GTT-Voice and PSTN Text Telephony 12g35.3.2 Functional details of fixed network interworking . 12g35.3.3 Emergency call considerations for GTT-Voice 13g35.3.4 Interworking aspects . 13g3Annex A (informative): GTT-Voice specific information for CTM support in, or associated with, all transcoders
21、. 14g3A.1 GTT-Voice specific information for CTM support in, or associated with, all transcoders in the access network for GSM networks with A-interface . 14g3A.2 GTT-Voice specific information for CTM support in or associated with all transcoders in the core network for networks supporting the Iu i
22、nterface 14g3Annex B (informative): GTT-Voice support via selection of CTM detection / conversion function . 16g3B.1 GTT-Voice specific information for CTM support in GSM networks with A-interface, via access network circuit pooling 16g3B.2 GTT-Voice specific information for CTM support via core net
23、work termination selection for networks using Iu interface 17g3Annex C (Informative): GTT-Voice specific information for the CTM-SRF core network node solution . 19g3ETSI ETSI TS 123 226 V15.0.0 (2018-06)43GPP TS 23.226 version 15.0.0 Release 15C.1 Emergency calls . 19g3C.2 Routing of regular user c
24、alls 20g3C.2.1 Mobile Terminating calls . 20g3C.2.2 Mobile originating calls 21g3C.2.3 Mobile to Mobile Calls . 22g3C.3 Routing actions of the CTM-SCP 22g3C.4 Routing actions of the CTM-SRF 24g3C.5 Service interactions 25g3C.5.1 Interaction with other CAMEL services . 25g3C.5.2 Interactions with Sup
25、plementary Services . 25g3C.5.3 Emergency Call interaction 25g3C.5.4 Usage of Destination Routing Address 25g3C.5.5 Inserting CTM/Text telephone conversion function . 25g3C.5.6 Lawful interception 26g3Annex D (informative): Change history . 27g3History 28g3ETSI ETSI TS 123 226 V15.0.0 (2018-06)53GPP
26、 TS 23.226 version 15.0.0 Release 15Foreword This Technical Specification has been produced by the 3rd Generation Partnership Project (3GPP). The contents of the present document are subject to continuing work within the TSG and may change following formal TSG approval. Should the TSG modify the con
27、tents of the present document, it will be re-released by the TSG with an identifying change of release date and an increase in version number as follows: Version x.y.z where: x the first digit: 1 presented to TSG for information; 2 presented to TSG for approval; 3 or greater indicates TSG approved d
28、ocument under change control. y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections, updates, etc. z the third digit is incremented when editorial only changes have been incorporated in the document. Introduction Real time, character by character te
29、xt conversation is a component that can be of value in a distant conversation. Users may have an interest to use real time text conversation alone or in any combination with voice and video. Global Text Telephony is a feature that adds the capability to use a text conversation component in a session
30、. It is called GTT here. GTT is defined in a set of host environments, circuit switched as well as packet switched. Interworking with corresponding features in other networks is an important part of Global Text Telephony. Specifically, the different kinds of PSTN text telephone systems supported by
31、the international text telephone modem standard ITU-T Recommendation V.18 4 are included in the modes for interworking consideration. One important reason to offer the Global Text feature is to enable emergency service access to people who are depending on a written dialogue. A more elaborated backg
32、round is found in TS 22.226 3, Global Text Telephony, Stage 1, Annex A. ETSI ETSI TS 123 226 V15.0.0 (2018-06)63GPP TS 23.226 version 15.0.0 Release 151 Scope This 3GPP Technical Specification defines the stage 2 description of the real time Text Conversation Feature called Global Text Telephony, GT
33、T. GTT Stage 2 identifies the functional capabilities needed to support the service described in GTT Stage 1. This TS contains the core functions for a real time Text Conversation Feature GTT, to be used in combination with other media in conversational services. GTT offers real time conversation in
34、 text, to be used alone or in combination with other conversational media, and interworking with current and emerging text conversation features in the fixed networks and other mobile networks. GTT uses a number of functional entities to realise the requirements of the stage 1 description (TS 22.226
35、 3). This TS describes how the service requirements are realised with these functional entities. As far as possible existing protocols shall be used for the realisation of the Global Text Telephony Feature. This may include e.g. , SIP, 3G.324, or Circuit Switched Voice service as protocol environmen
36、ts, and CTM, AL1 and RTP/text as transmission protocols. It also means usage of existing text presentation format ITU-T Recommendation T.140 5, common to all GTT text conversation environments. 2 References The following documents contain provisions which, through reference in this text, constitute
37、provisions of the present document. - References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific. - For a specific reference, subsequent revisions do not apply. - For a non-specific reference, the latest version applies. In the case of a
38、reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document. 1 3GPP TS 22.101: “Service Principles“. 2 3GPP TS 22.121: “The Virtual home Environment“. 3 3GPP TS 22.226: “Global
39、Text Telephony; Stage 1 service description“. 4 ITU-T Recommendation V.18: “Operational procedures for modems in the text telephone mode“. 5 ITU-T Recommendation T.140: “Text conversation presentation protocol“. 6 3GPP TS 26.110: “Codec for 3G CS Multimedia (2000)“. 7 ITU-T Recommendation H.323 Anne
40、x G: “Text conversation and text SET (2000)“. 8 ITU-T Recommendation H.224 (2000): “Very low bitrate multimedia system“. 9 ITU-T Recommendation H.248.2: “Facsimile, Text Conversation and Call Discrimination Packages“. 10 IETF RFC 4103: “RTP-Text. RTP Payload for Text Conversation“. 11 IETF RFC 3261:
41、 “SIP: Session Initiation Protocol“. 12 3GPP TS 26.226: “CTM Cellular Text telephony Modem, General description“. 13 ITU-T Recommendation F.703: “Multimedia Conversation Service Description (2000)“. 14 3GPP TS 26.235: “Codec for packet switched conversation“. 15 3GPP TS 48.008: “Mobile-services Swit
42、ching Centre - Base Station System (MSC - BSS) interface; Layer 3 specification“. ETSI ETSI TS 123 226 V15.0.0 (2018-06)73GPP TS 23.226 version 15.0.0 Release 1516 3GPP TS 24.008: “Mobile radio interface layer 3 specification; Core Network Protocols - Stage 3“. 17 3GPP TS 26.114: “IP Multimedia Subs
43、ystem (IMS); Multimedia Telephony; Media handling and interaction“. 18 3GPP TS 29.163: “Interworking between the IM CN subsystem and CS networks - Stage 3“. 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply. Total Conv
44、ersation: A service offering standardised simultaneous text, video and voice conversation or a subset thereof (see ITU-T Recommendation F.703 13). Host environment: The session environment where the text component is added. e.g. Circuit switched voice, IP Multimedia, etc. Text Conversation: A real t
45、ime conversation in text with transmission character by character as entered. 3.2 Abbreviations For the purposes of this document the following abbreviations apply in addition to those defined in TS 22.226 3: GTT Global Text Telephony CTM Cellular Text telephone Modem, as specified in TS 26.226 12 B
46、CSM Basic Call State Model CAMEL Customised Application for Mobile Enhanced Logic CAP CAMEL Application Protocol CLIP Calling Line Presentation CPC Calling Party CategoryGMSC Gateway MSC HPLMN Home PLMNISUP ISDN User Part MSC Mobile Switching Centre MSRN Mobile Station Roaming Number NDC National De
47、stination Code PLMN Public Land Mobile Network SK Service Key TRAU Transcoder and Rate Adaption Unit UMTS Universal Mobile Telecommunication System VLR Visited Location Register ETSI ETSI TS 123 226 V15.0.0 (2018-06)83GPP TS 23.226 version 15.0.0 Release 154 General Functions 4.1 Overview Cellular N
48、etwork Cellular Network Fixed Network IP network GTT Environment Fixed textphone user IP textphone or multimedia user Fixed multimedia user Mobile, text capable terminals Figure 1: General view of GTT feature provision within the different networks Figure 1 shows a generalised view of the Global Tex
49、t Telephony feature architecture for a third generation conversation service system. It shall combine different networks and network types and shall integrate text conversation systems already existent within these networks. Global Text Telephony is a 3GPP Feature that can be included in 3GPP conversation services such as circuit switched voice telephony, circuit switched multimedia and IP multimedia conversation. It makes use of the infrastructure of the host environment and includes elements necessary for GTT in these env
