1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TE LEC0 MM UN I CATI0 N STANDARDIZATION SECTOR OF ITU Q.765.4 (O 6/20 00) SERIES Q: SWITCHING AND SIGNALLING Specifications of Signalling System No. 7 - ISDN user part Signalling system No. 7 - Application transport mechanism: Support of the generic addres
2、sing and transport protocol ITU-T Recommend at ion Q .765.4 (Formerly CCITT Recommendation) COPYRIGHT International Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling ServicesITU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL S
3、ERVICE FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN SPECIFICATIONS OF SIGNALLING SYSTEMS No. 4 AND No. 5 SPECIFICATIONS OF SIGNALLING SYSTEM No. 6 SPECIFICATIONS OF SIGNALLING SYSTEM R1 SPECIFICATIONS OF SIGNALLING SYSTEM R2 DIGITAL EXCHANGES INTERWORKING OF SIGNALLING SYSTEMS SPECIFICAT
4、IONS OF SIGNALLING SYSTEM No. 7 INTERNATIONAL AUTOMATIC AND SEMI-AUTOMATIC WORKING CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS General Message transfer part (MTP) Signalling connection control part (SCCP) Telephone user part (TUP) ISDN supplementary services Data user part Q.1-Q.3 Q.4-Q.59 Q.60GQ.9
5、9 Q. 100-Q. 119 Q. 120-Q.249 Q.250-Q.3 09 Q.310-Q.399 Q.400-Q.499 Q. 500-Q. 5 99 Q.600-Q.699 Q.700-Q.799 Q.700 Q.711-Q.719 Q.701-Q.709 Q.720-Q.729 Q.730-Q.739 Q.740-Q.749 Signalling Svstem No. 7 management 0.750-0.75 9 ISDN user part Q.76tLQ.769 Transaction capabilities application part Test specifi
6、cation Q3 INTERFACE DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 PUBLIC LAND MOBILE NETWORK INTERWORKING WITH SATELLITE MOBILE SYSTEMS INTELLIGENT NETWORK BROADBAND ISDN SIGNALLING REQUIREMENTS AND PROTOCOLS FOR IMT-2000 Q.770-Q.779 Q. 7 80-Q.799 Q.800-Q.849 Q. 8 50-Q. 999 Q. 1000-Q. 1099 Q. 1100-Q. 1
7、199 Q.1200-Q. 1699 Q.1700-Q. 1799 Q.2000-Q.2999 For further details, please refer to the list of ITU-T Recommendations. COPYRIGHT International Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling ServicesITU-T Recommendation Q.765.4 Signalling system No. 7 - Application t
8、ransport mechanism: Support of the generic addressing and transport protocol Summary This Recommendation describes the extensions required for the support of the Generic Addressing and Transport protocol (GAT) mechanism over the public Network Nodal Interface (“I). This application makes use of the
9、Application Transport Mechanism (APM) described in ITU-T Q.765 (2000) for bearer related signalling, and the Transaction Capability (TC) for signalling involving no bearer. This Recommendation specifies the respective users (i.e. APM-user, TC-user) to support signalling applications using the Generi
10、c Addressing and Transport protocol as defined in ITU-T Q.860. Source ITU-T Recommendation Q.765.4 was prepared by ITU-T Study Group 11 (1997-2000) and approved under the WTSC Resolution 1 procedure on 15 June 2000. Keywords APM, GAT, ISUP, SS7, TCAP. ITU-T 0.765.4 (06/2000) i COPYRIGHT Internationa
11、l Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling ServicesFOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent orga
12、n of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, establishes the
13、 topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSC Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are
14、 prepared on a collaborative basis with IS0 and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that th
15、e practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation
16、development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest information and are t
17、herefore strongly urged to consult the TSB patent database. O ITU 2001 All rights reserved. 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 ITU. ITU-T 0.765.4 (06
18、/2000) 11 COPYRIGHT International Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling ServicesCONTENTS Page 1 2 3 4 5 6 6.1 6.2 7 7.1 7.2 7.3 8 8.1 8.2 8.3 9 9.1 9.2 9.3 10 10.1 Scope References Definitions Abbreviations . Recommendation structure . Modelling . Network mo
19、del . Specification model 6.2.1 Introduction . 6.2.2 General model . 6.2.3 Dynamic primitive flows . Application Process functions General . GAT Application Process functions . Connection with call (bearer related) 7.2.1 Introduction . 7.2.2 Primitive interface . 7.2.3 Procedures . 7.2.4 Exceptional
20、 procedures . 7.2.5 Primitive contents GAT Application Process functions - Connection without call (bearer unrelated) . 7.3.1 Introduction . 7.3.2 Primitive interface (AP-TC SACF) . 7.3.3 Connection Oriented signalling procedures 7.3.4 Primitive contents Single Association Control Function (SACF) .
21、ISUP SACF Introduction Information flows related to messages sent by the node Information flows related to messages received by the node . Single Association Control Function (SACF) . TC SACF Introduction Information flows related to operations sent by a node Information flows related to operations
22、received by a node Bearer-related GAT ASE (BRGAT ASE) Primitive interface ITU-T 0.765.4 (06/2000) 1 1 2 2 3 11 11 12 12 12 13 14 14 14 14 15 15 16 17 17 18 18 19 19 19 19 20 20 . 111 COPYRIGHT International Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling Services10.2
23、10.3 11 11.1 11.2 11.3 11.4 11.5 11.6 11.7 11.8 12 12.1 12.2 13 13.1 13.2 13.3 13.4 14 15 Signalling procedures . 10.2.1 Sending procedures . 10.2.2 Receiving procedures 10.2.3 APM-U-Error Primitive . 10.2.4 Signalling congestion Primitive contents . Connection Oriented GAT ASE (COGAT ASE) . TC-user
24、 sequence . Interface COGAT ASE- SACF Supported operations ASE procedures 11.4.1 Relationship between the COGAT-ASE and TCAP . 11.4.2 Operations . 1 1.4.3 Expiry of timers . 1 1.4.4 Signalling congestion Primitive contents . Abstract syntax, general . Subsystem number ASN.l module TCAP (TC ASE) . In
25、terface TCAP-SACF . Use of TCAP SCCP Interface SCCP-SACF Use of SCCP . Routing in the SCCP network Number information used for routing . Formats and Codes of Application Data . Timers . Page 20 20 20 20 21 21 21 21 22 23 23 23 24 25 26 26 26 26 26 29 29 29 29 29 29 29 30 30 30 iv ITU-T 0.765.4 (06/2
26、000) COPYRIGHT International Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling ServicesITU-T Recommendation Q.765.4 Signalling system No. 7 - Application transport mechanism: Support of the generic addressing and transport protocol 1 Scope This Recommendation describes
27、the extensions required for the support of the Generic Addressing and Transport protocol (GAT) mechanism over the public Network Nodal Interface (“I). This application makes use of the Application Transport Mechanism (APM) described in ITU-T Q.765 (2000) for bearer-related signalling, and the Transa
28、ction Capability (TC) for signalling involving no bearer. This Recommendation specifies the respective users (i.e. APM-user, TC-user) to support signalling applications using the Generic Addressing and Transport protocol as defined in ITU-T Q.860. 2 References The following ITU-T Recommendations and
29、 other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; all users of this Recommendation are therefore en
30、couraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. ITU-T Q.765 (2000), Signalling System No. 7 -Application transport mechanism. ITU-T Q.860
31、(2000), Integrated services digital network (ISDN) and broadband integrated services digital network (B-ISDN) generic addressing and transport (GAT) protocol. ITU-T Q.763 (1999), Signalling System No. 7 - ISDN User Part formats and codes. ITU-T Q.764 (1999), Signalling System No. 7 - ISDN User Part
32、signallingprocedures. ITU-T Q. 1400 (1993), Architecture framework for the development of signalling and OA e non-protocol functions, i.e. exchange nodal functions; this is referred to as the “Application Process“. This Recommendation describes only the part of the total Application Process and Prot
33、ocol functions in the exchange that relates to NNI enhancements for the support of the Generic Addressing and Transport protocol. The protocol functions are subdivided into two areas: signalling associations with a bearer (ISUP), and signalling associations without a bearer (Connection Oriented TC-u
34、ser). For calls with a bearer, it describes the use of the services provided by the APM i. For signalling requiring no bearer, it describes the services provided by TCAP. The signalling association with a bearer is subdivided into three parts: Bearer Related Generic Addressing and Transport protocol
35、 Applications (BRGAT ASE), Application Transport Mechanism (APM ASE) and ISUP Basic Call (ISUP ASE). These are coordinated by the Single Association Coordination Function (SACF). The Connection Oriented signalling association without a bearer is subdivided into two parts: Connection Oriented GAT (CO
36、GAT ASE), and Transaction Capability (TC ASE). These are coordinated by the Single Association Coordination Function (SACF). The Application Process (AP) contains all Call Control functions; however, this Recommendation will only describe the enhancements required to support the Generic Addressing a
37、nd Transport protocol. The Application Process relevant to GAT-Control can be found in other Recommendations 2, as can that for the ISUP basic call 4. The service primitive technique, used to define the ASES and the SACF specific to the applications signalling needs is a way of describing how the se
38、rvices offered by an ASE or SACF - the provider of (a set of) service(s) - can be accessed by the user of the service(s) -the SACF or the Application Process (AP), respectively. The service primitive interface is a conceptual interface and is not a testable or accessible interface. It is a descripti
39、ve tool. The use of service primitives at an interface does not imply any particular implementation of that interface, nor does it imply that an implementation must conform to that particular service primitive interface to provide the stated service. All conformance to the ISUP specifications is bas
40、ed on the external behaviour at a node, i.e. on the generation of the correct ITU-T 0.765.4 (06/2000) 3 COPYRIGHT International Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling Servicesmessage structure (as specified in 3)/operation structure (as specified in this Reco
41、mmendation) and in the proper sequence (as specified in 4 and in this Recommendation). The structure and examples of its usage are illustrated diagrammatically in 6.2. The relationship between the GAT functionality and the Application Transport Mechanism services provided by the public NNI is descri
42、bed as a network model in 6.1. The APM ASE provides the enhancements to the ISUP capabilities such that the services available to the APM-user (GAT application in this context) for a signalling association requiring a bearer are similar to those offered by TCAP where no bearer is required. 6 Modelli
43、ng The models described in this clause introduce concepts and terminology used in this specification of the GAT applications use of the capability of the Application Transport Mechanism (APM) for bearer related signalling and the use of Transaction Capability (TC) for bearer unrelated signalling. 6.
44、1 Network model This clause illustrates the relationship between the GAT application and the APM implemented across the public network. Figure 1 provides an example of a call from an initiating application to an addressed application via a public transit network. TI 1 108340-00 Figure UQ.765.4 - One
45、 example of a bearer related communication between two nodes for a GAT application and its relationship with the public “Is PIN/PAN concept The Public Initiating Node (PIN) and Public Addressed Node (PAN) concept is introduced in 11 to assist in the description of the APM. The PIN represents the poi
46、nt in the network where an APM-user, in this case BRGAT, wishes to initiate communication towards a peer APM-user located at an addressed location (PAN) in the network. The PIN/PAN relationship for the GAT application is either established at call set-up or at any other phase of the call following t
47、he principle described in i. At any phase of the call, the APM addressing mechanism is used to specify the location of the PAN. Either the initiating APM-user (BRGAT ASE in this context) supplies the address of the node where the Application information shall be delivered (explicit addressing), or n
48、o address is provided by the initiating application (implicit addressing), in which case the PAN is the next node supporting the APM-user (BRGAT ASE in this context). In case of explicit addressing, intermediate public nodes with the ability to support the GAT functionality may be passed, in which c
49、ase the APM ASE forwards the application information based on the address information associated to it. 4 ITU-T 0.765.4 (06/2000) COPYRIGHT International Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling ServicesThe public basic call mechanism is employed to provide an association between the PIN and the PAN. In routing through the public network, the call may pass through intermediate public nodes (TE) without the ability to support the GAT functionality. In that case, the node will behave as a normal intermediate public node. Figure 2 provides
