1、 ETSI TS 123 226 V14.0.0 (2017-05) Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; Global text telephony (GTT); Stage 2 (3GPP TS 23.226 version 14.0.0 Release 14) TECHNICAL SPECIFICATION ETSI ETSI TS 123 226 V14.0.0 (2017-05)13GPP
2、TS 23.226 version 14.0.0 Release 14Reference RTS/TSGS-0223226ve00 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
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9、nd owned by the GSM Association. ETSI ETSI TS 123 226 V14.0.0 (2017-05)23GPP TS 23.226 version 14.0.0 Release 14Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is
10、publicly available for ETSI 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
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12、 or may become, essential to the present document. Foreword This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP). The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or GSM identities. The
13、se should be interpreted as being references to the corresponding ETSI deliverables. The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under http:/webapp.etsi.org/key/queryform.asp. Modal verbs terminology In the present document “shall“, “shall not“, “should“, “should not
14、“, “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 the expression of provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TS 123 2
15、26 V14.0.0 (2017-05)33GPP TS 23.226 version 14.0.0 Release 14Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 5g3Introduction 5g31 Scope 6g32 References 6g33 Definitions and abbreviations . 7g33.1 Definitions 7g33.2 Abbreviations . 7g34 General Functions 8
16、g34.1 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 coding . 9g34.1.2.3 Transport and transmission host environments . 9g34.1.2.4 Multiplexing 9g34.1.2.5 Conversion 10g34.1.2.6 Text capable termina
17、l 10g34.1.2.7 Routing and location of CTM detection/conversion functions . 10g34.1.3 Emergency service considerations 10g35 Considerations for each host environment . 11g35.1 GTT-IP: IP Multimedia 11g35.1.0 GTT-IP 11g35.1.1 Interworking between Real-Time Text and PSTN Text Telephony . 11g35.1.2 Emer
18、gency call considerations for GTT-IP 11g35.2 GTT-CS: Circuit switched Multimedia 12g35.3 GTT-Voice: Circuit switched voice channel 12g35.3.1 Interworking between GTT-Voice and PSTN Text Telephony 12g35.3.2 Functional details of fixed network interworking . 13g35.3.3 Emergency call considerations for
19、 GTT-Voice 13g35.3.4 Interworking aspects . 14g3Annex A (informative): GTT-Voice specific information for CTM support in, or associated with, all transcoders . 15g3A.1 GTT-Voice specific information for CTM support in, or associated with, all transcoders in the access network for GSM networks with A
20、-interface . 15g3A.2 GTT-Voice specific information for CTM support in or associated with all transcoders in the core network for networks supporting the Iu interface 15g3Annex B (informative): GTT-Voice support via selection of CTM detection / conversion function . 17g3B.1 GTT-Voice specific inform
21、ation for CTM support in GSM networks with A-interface, via access network circuit pooling 17g3B.2 GTT-Voice specific information for CTM support via core network termination selection for networks using Iu interface 18g3Annex C (Informative): GTT-Voice specific information for the CTM-SRF core netw
22、ork node solution . 20g3ETSI ETSI TS 123 226 V14.0.0 (2017-05)43GPP TS 23.226 version 14.0.0 Release 14C.1 Emergency calls . 20g3C.2 Routing of regular user calls 21g3C.2.1 Mobile Terminating calls . 21g3C.2.2 Mobile originating calls 22g3C.2.3 Mobile to Mobile Calls . 23g3C.3 Routing actions of the
23、 CTM-SCP 23g3C.4 Routing actions of the CTM-SRF 25g3C.5 Service interactions 26g3C.5.1 Interaction with other CAMEL services . 26g3C.5.2 Interactions with Supplementary Services . 26g3C.5.3 Emergency Call interaction 26g3C.5.4 Usage of Destination Routing Address 26g3C.5.5 Inserting CTM/Text telepho
24、ne conversion function . 26g3C.5.6 Lawful interception 27g3Annex D (informative): Change history . 28g3History 29g3ETSI ETSI TS 123 226 V14.0.0 (2017-05)53GPP TS 23.226 version 14.0.0 Release 14Foreword This Technical Specification has been produced by the 3rd Generation Partnership Project (3GPP).
25、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 contents 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
26、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 document under change control. y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections, update
27、s, etc. z the third digit is incremented when editorial only changes have been incorporated in the document. Introduction Real time, character by character text conversation is a component that can be of value in a distant conversation. Users may have an interest to use real time text conversation a
28、lone 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. It is called GTT here. GTT is defined in a set of host environments, circuit switched as well as packet switched. Interworking with correspo
29、nding features in other networks is an important part of Global Text Telephony. Specifically, the different kinds of PSTN text telephone systems supported by the international text telephone modem standard ITU-T Recommendation V.18 4 are included in the modes for interworking consideration. One impo
30、rtant 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 background is found in TS 22.226 3, Global Text Telephony, Stage 1, Annex A. ETSI ETSI TS 123 226 V14.0.0 (2017-05)63GPP TS 23.226 version 14.0.0 R
31、elease 141 Scope This 3GPP Technical Specification defines the stage 2 description of the real time Text Conversation Feature called Global Text Telephony, GTT. GTT Stage 2 identifies the functional capabilities needed to support the service described in GTT Stage 1. This TS contains the core functi
32、ons 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 text, to be used alone or in combination with other conversational media, and interworking with current and emerging text conversation featur
33、es 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 3). This TS describes how the service requirements are realised with these functional entities. As far as possible existing protocols shall b
34、e 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 environments, and CTM, AL1 and RTP/text as transmission protocols. It also means usage of existing text presentation format ITU-T Recommendation T.140 5
35、, common to all GTT text conversation environments. 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present document. - References are either specific (identified by date of publication, edition number, version number, etc.)
36、 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 reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in
37、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 Text Telephony; Stage 1 service description“. 4 ITU-T Recommendation V.18: “Operational procedures for modems in the text telephone mode“. 5 I
38、TU-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 Annex G: “Text conversation and text SET (2000)“. 8 ITU-T Recommendation H.224 (2000): “Very low bitrate multimedia system“. 9 ITU-T Recommendatio
39、n 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: “SIP: Session Initiation Protocol“. 12 3GPP TS 26.226: “CTM Cellular Text telephony Modem, General description“. 13 ITU-T Recommendation F.70
40、3: “Multimedia Conversation Service Description (2000)“. 14 3GPP TS 26.235: “Codec for packet switched conversation“. ETSI ETSI TS 123 226 V14.0.0 (2017-05)73GPP TS 23.226 version 14.0.0 Release 1415 3GPP TS 48.008: “Mobile-services Switching Centre - Base Station System (MSC - BSS) interface; Layer
41、 3 specification“. 16 3GPP TS 24.008: “Mobile radio interface layer 3 specification; Core Network Protocols - Stage 3“. 17 3GPP TS 26.114: “IP Multimedia Subsystem (IMS); Multimedia Telephony; Media handling and interaction“. 18 3GPP TS 29.163: “Interworking between the IM CN subsystem and CS networ
42、ks - Stage 3“. 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply. Total Conversation: A service offering standardised simultaneous text, video and voice conversation or a subset thereof (see ITU-T Recommendation F.703
43、13). Host environment: The session environment where the text component is added. e.g. Circuit switched voice, IP Multimedia, etc. Text Conversation: A real time conversation in text with transmission character by character as entered. 3.2 Abbreviations For the purposes of this document the followin
44、g 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 BCSM Basic Call State Model CAMEL Customised Application for Mobile Enhanced Logic CAP CAMEL Application Protocol CLIP Calling Line Presentatio
45、n CPC Calling Party CategoryGMSC Gateway MSC HPLMN Home PLMNISUP ISDN User Part MSC Mobile Switching Centre MSRN Mobile Station Roaming Number NDC National Destination Code PLMN Public Land Mobile Network SK Service Key TRAU Transcoder and Rate Adaption Unit UMTS Universal Mobile Telecommunication S
46、ystem VLR Visited Location Register ETSI ETSI TS 123 226 V14.0.0 (2017-05)83GPP TS 23.226 version 14.0.0 Release 144 General Functions 4.1 Overview Cellular Network Cellular Network Fixed Network IP network GTT Environment Fixed textphone user IP textphone or multimedia user Fixed multimedia user Mo
47、bile, text capable terminals Figure 1: General view of GTT feature provision within the different networks Figure 1 shows a generalised view of the Global Text Telephony feature architecture for a third generation conversation service system. It shall combine different networks and network types and
48、 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 infr
49、astructure of the host environment and includes elements necessary for GTT in these environments. The following description and figures describe the text specific parts and leave out many details of the host environment conversation service where text is included. 4.1.1 General text transmission functions On the route from user to user, the text passes a set of functional elements. Text User Interface Text presentation coding Detection/ Activation/ Text Transport Multiplexing/ Transmission Text User Interface Text Presenta
