1、 ETSI TS 1Digital cellular telecoUniversal Mobile TelGlobal (3GPP TS 23.2TECHNICAL SPECIFICATION123 226 V13.0.0 (2016communications system (Phaelecommunications System (LTE; al text telephony (GTT); Stage 2 .226 version 13.0.0 Release 1316-01) hase 2+); (UMTS); 13) ETSI ETSI TS 123 226 V13.0.0 (2016
2、-01)13GPP TS 23.226 version 13.0.0 Release 13Reference RTS/TSGS-0223226vd00 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-P
3、rfecture de 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
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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. European Telecommunications Standards Institute 2016. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI
8、 logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM and LTE are Trade Marks of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. GSM and the GSM logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI TS 123 226 V1
9、3.0.0 (2016-01)23GPP TS 23.226 version 13.0.0 Release 13Intellectual 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 publicly available for ETSI members and non-members, and
10、 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:/ipr.etsi.org/). Pursuant to the
11、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 to the present document. Forew
12、ord 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. These should be interpreted as being references to the corr
13、esponding 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“, “may“, “need not“, “will“, “will not“, “can“ and “can
14、not“ 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 123 226 V13.0.0 (2016-01)33GPP TS 23.226 version 13.0.0 Relea
15、se 13Contents 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 8g34.1 Overview 8g34.1.1 General text transmission functi
16、ons 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 terminal 10g34.1.2.7 Routing and location of CTM detection/conv
17、ersion 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 Emergency call considerations for GTT-IP 11g35.2 GTT-CS: Cir
18、cuit 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 GTT-Voice 13g35.3.4 Interworking aspects . 14g3Annex A
19、(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-interface . 15g3A.2 GTT-Voice specific information for
20、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 information for CTM support in GSM networks with A-interface,
21、via access network circuit pooling 17g3B.2 GTT-Voice specific information for CTM support via core network termination selection for networks using Iu interface 18g3ETSI ETSI TS 123 226 V13.0.0 (2016-01)43GPP TS 23.226 version 13.0.0 Release 13Annex C (Informative): GTT-Voice specific information fo
22、r the CTM-SRF core network node solution . 20g3C.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 CTM-SCP 23g3C.4 Routing actions of the CTM-SRF 25g3C.5
23、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 telephone conversion function . 26g3C.5.6 Lawful interception 2
24、7g3Annex D (informative): Change history . 28g3History 29g3ETSI ETSI TS 123 226 V13.0.0 (2016-01)53GPP TS 23.226 version 13.0.0 Release 13Foreword This Technical Specification has been produced by the 3rd Generation Partnership Project (3GPP). The contents of the present document are subject to cont
25、inuing 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 as follows: Version x.y.z where: x the first digit: 1 pr
26、esented 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, updates, etc. z the third digit is incremented when editorial
27、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 alone or in any combination with voice and video. Global
28、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 corresponding features in other networks is an important part of
29、 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 important reason to offer the Global Text feature is to enab
30、le 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 V13.0.0 (2016-01)63GPP TS 23.226 version 13.0.0 Release 131 Scope This 3GPP Technical Specification defin
31、es 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 functions for a real time Text Conversation Feature GTT, to be
32、 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 features in the fixed networks and other mobile networks. GTT
33、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 be used for the realisation of the Global Text Telephony
34、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, common to all GTT text conversation environments. 2 Re
35、ferences 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.) or non-specific. - For a specific reference, subsequent
36、 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 the same Release as the present document. 1 3GPP TS 22.1
37、01: “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 ITU-T Recommendation T.140: “Text conversation presentati
38、on 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 Recommendation H.248.2: “Facsimile, Text Conversation and Call Discri
39、mination 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.703: “Multimedia Conversation Service Description (2000)“.
40、 14 3GPP TS 26.235: “Codec for packet switched conversation“. ETSI ETSI TS 123 226 V13.0.0 (2016-01)73GPP TS 23.226 version 13.0.0 Release 1315 3GPP TS 48.008: “Mobile-services Switching Centre - Base Station System (MSC - BSS) interface; Layer 3 specification“. 16 3GPP TS 24.008: “Mobile radio inte
41、rface 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 networks - Stage 3“. 3 Definitions and abbreviations 3.1 Defin
42、itions 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 13). Host environment: The session environment where the
43、 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 following abbreviations apply in addition to those defined in TS
44、 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 Presentation CPC Calling Party CategoryGMSC Gateway MSC HPLMN Home
45、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 System VLR Visited Location Register ETSI ETSI TS 123 226
46、 V13.0.0 (2016-01)83GPP TS 23.226 version 13.0.0 Release 134 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 Mobile, text capable terminals Figure 1: General view of G
47、TT 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 shall integrate text conversation systems already exist
48、ent 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
49、 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 Presentation coding Detection/ Activation/ Text Transport Multip
