1、INTERNATIONAL TELECOMMUNICATION UNION ITU=T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Q.761 (1 2/99) SERIES Q: SWITCHING AND SIGNALLING Specifications of Signalling System No. 7 - ISDN user part Signalling system No. 7 - ISDN user part functional description ITU-T Recommendation Q.761 (Previou
2、sly CCITT Recommendation) INTERNATIONAL TELECOMMUNICATION UNION ITU=T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Q.761 (I 2/99) SERIES Q: SWITCHING AND SIGNALLING Specifications of Signalling System No. 7 - ISDN user part Signalling system No. 7 - ISDN user part functional description ITU-T Rec
3、ommendation Q.761 (Previously CCIU Recommendation) ITU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN SPECIFICATIONS OF SIGNALLING SYSTEMS No. 4 AND No. 5 SPECIFICATIONS OF SIGNALLING SYSTEM
4、No. 6 SPECIFICATIONS OF SIGNALLING SYSTEM R1 SPECIFICATIONS OF SIGNALLING SYSTEM R2 DIGITAL EXCHANGES INTERWORKING OF SIGNALLING SYSTEMS SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 INTERNATIONAL AUTOMATIC AND SEMI-AUTOMATIC WORKING CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS General Message transfer
5、part (MTP) Signalling connection control part (SCCP) Telephone user part (TUP) ISDN supplementary services Data user part Signalling System No. 7 management Q.l-Q.3 Q.4-Q.59 Q.60-Q.99 Q.100-Q.119 Q.120-Q.249 Q.250-Q.309 Q.310-Q.399 Q.400-Q.499 Q.500-Q.599 Q.600-Q.699 Q.700-Q.849 (2.700 Q.7014.709 (2
6、.71 14.719 (2.7204.729 Q.730-Q.739 Q.740-Q.749 Q.750-Q.759 4.760-4.769 Transaction capabilities application part a: 770-Q. 779 Test specification Q3 interface DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 PUBLIC LAND MOBILE NETWORK INTERWORKING WITH SATELLITE MOBILE SYSTEMS INTELLIGENT NETWORK BROADBAN
7、D ISDN SIGNALLING REQUIREMENTS AND PROTOCOLS FOR IMT-2000 Q.780-(2.799 Q .80W. 849 Q.85W.999 Q. I OOO-Q.1 O99 Q.llOO-Q.1199 Q.1200-Q.1699 Q. 170O-Q. 1799 Q.200W.2999 For further details, please refer to ITU-T List of Recommendations. ITU-T RECOMMENDATION Q.761 SIGNALLING SYSTEM NO. 7 - ISDN USER PAR
8、T FUNCTIONAL DESCRIPTION Summary The ISDN user part is the signalling system No. 7 protocol which provides the signalling functions required to support basic bearer services and supplementary services for voice and non-voice applications in an integrated services digital network. The ISDN user part
9、is also suited for application in dedicated telephone and circuit switched data networks and in analogue and mixed analogue/digital networks. In particular, the ISDN user part meets the requirements defined by the ITU-T for worldwide international semi-automatic and automatic telephone and circuit s
10、witched data traffic. The ISDN user part is furthermore suitable for national applications. Most signalling procedures, information elements and message types specified for international use are also required in typical national applications. Moreover, coding space has been reserved in order to allo
11、w national Administrations and recognized operating agencies to introduce network specific signalling messages and elements of information within the internationally standardized protocol structure. Source ITU-T Recommendation 4.761 was revised by ITU-T Study Group 11 (1997-2000) and was approved un
12、der the WTSC Resolution No. 1 procedure on 3 December 1999. Recommendation Q.761 (12/99) i FOREWORD ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ o
13、f the ITU. The 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 Coderence (WTSC), which meets every four years, establishes
14、 the topics for study by the ITU-T Study Groups which, in their turn, produce Recommendations on these topics. The approval of Recommendations by the Members of the ITU-T is covered by the procedure laid down in WTSC Resolution No. 1. In some areas of information technology which fall within ITU-Ts
15、purview, the necessary standards are 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 recognize operating agency. INTELLECTUAL PROPERTY RIGHTS The ITU dra
16、ws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. The ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU membe
17、rs or others outside of the Recommendation development process. As of the date of approval of this Recommendation, the 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
18、 not represent the latest information and are therefore strongly urged to consult the TSB patent database. O ITU 2000 All rights resmed. 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 perm
19、ission in writing from the ITU. ii Recommendation 4.761 (12/99) - H48b259L Obb8807 78b CONTENTS Page 1 1.1 1.2 1.3 2 2.1 2.2 2.3 2.4 3 3.1 3.2 4 4.1 4.2 5 5.1 5.2 5.3 6 6.1 6.2 General Scope References . Terms and definitions . Introduction to ISDN user part (ISUP) signalling procedures . Address si
20、gnalling Signalling methods . Intenvorking 2.4.1 ISUP intenvorking 2.4.2 Interworking with other signalling system or user parts Capabilities supported by the ISDN user part . Internationally applicable class . Services assumed from the Message Transfer Part (MTP) Description of primitives Basic pro
21、cedures . National use class General 4.2.1 Transfer 4.2.2 Pause 4.2.3 Resume . 4.2.4 Status . End-to-end signalling . General SCCP method of end-to-end signalling . Pass-along method of end-to-end signalling Future enhancements and compatibility procedure., Version compatibility . Additional coding
22、guidelines for compatibility of ISDN User Parts . 6.2.1 Messages 6.2.2 Parameters Appendix I . Guidelines for use of instruction indicators I . 1 Introduction . 1.2 Priority of execution 1.3 Notification . 1 1 2 2 3 3 3 3 3 3 4 4 6 7 7 7 7 7 8 8 8 8 8 9 9 9 10 12 12 13 13 13 13 13 . Recommendation 4
23、.76 1 (1 2/99) 111 1.4 Considerations . 1.4.1 Discarding unrecognized messages 1.4.2 Essential services . 1.4.3 Non-essential services 1.4.4 Broadban all users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations an
24、d other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. ITU-T Recommendation E. 164 (1 997), The international public telecommunication numbering plan. ITU-T Recommendation I. 1 12 (1 993), Vocabulary of terms for ISDNs. ITU-T Recommendation 1.2 1
25、 O (1993), Principles of telecommunication services supported by an ISDN and the means to describe them. ITU-T Recommendation 4.850 (1998), Usage of cause and location in the digital subscriber signalling system No. I and the signalling system No. 7 ISDN user part. ITU-T Recommendation 4.730 (1 999)
26、, ISDN user part supplementary services. ITU-T Recommendation 4.762 (1999), Signalling system No. 7 - ISDN user part general functions of messages and signals. ITU-T Recommendation 4.763 (1999), Signalling system No. 7 - ISDN user part formats and codes. ITU-T Recommendation 4.764 (1999), Signalling
27、 system No. 7 - ISDN userpart signalling procedures. ITU-T Recommendation Q.766 (1 993), Performance objectives in the integrated services digital network application. ITU-T Recommendation 4.765 (1998), Signalling system No. 7 - Application transport mechanism. ITU-T Recommendation 4.769.1 (1999), S
28、ignalling system No. 7 - ISDN user part enhancements for the support of Number Portability. Terms and definitions This Recommendation defines the following terms: 1.3.1 See definition 308 in 2.1h. 112 121. 1.3.2 service; telecommunication service See denition 201 in 2.1D.112 2. 1.3.3 subaddress See
29、12.2E.164 i. 1.3.4 supplementary service See 2.4A.210 3. Integrated Services Digital Network (ISDN) 2 Recommendation 4.761 (12/99) 1.3.5 ISUP92 1993 publication of ISUP Recommendations. 2 Introduction to ISDN user part (ISUP) signalling procedures 2.1 Address signalling In general, the call set-up p
30、rocedure described is standard for both speech and non-speech connections using en bloc address signalling for calls between ISDN terminals. Overlap address signalling is also specified. 2.2 Basic procedures The basic call control procedure is divided into three phases: call Set-up, the datdconversa
31、tion phase and call cleardown. Messages on the signalling link are used to establish and terminate the different phases of a call. Standard in-band supervisory tones andor recorded announcements are returned to the caller on appropriate connection types to provide information on call progress. Calls
32、 originating from ISDN terminals may be supplied with more detailed call progress information by means of additional messages in the access protocol supported by a range of messages in the network. 2.3 Signalling methods Two signalling methods are used in this Recommendation: - end-to-end. The link-
33、by-link method is primarily used for messages that need to be examined at each exchange (see clause 5). The end-to-end methods are used for messages of end point significance (see Recommendation 4.730 SI). The link-by-link method may be used for messages of end point significance. - link-by-link; 2.
34、4 Interworking 2.4.1 ISUP interworking In call control intenvorking between two (ISUP) protocols, the call control provides the intenvorking logic. Peer-to-peer intenvorking takes place between two exchanges that support different implementations of the same protocol. Interworking is realized follow
35、ing interpretation of the protocol information received by either exchange. For this purpose, starting with ISUP92, only one ISUP protocol implementation may be present in an exchange since ISUP92 is backwards compatible with previous versions of ISUP as a result of: - The basic call procedures and
36、the supplementary service procedures from ISUP92 onwards ensure backwards compatibility with the ISUP procedures conforming to the 1988 version (Blue Book) and those conforming to Recommendation Q.767. No knowledge is required to be stored in the exchange to this effect. NOTE - When upgrading the IS
37、UP signalling capabilities on existing ISUP relations, the rules as contained in clause YQ.784.2 should be followed to enable the execution of compatibility testing before the new ISUP signalling capabilities are put into service. Recommendation Q.761 (12/99) 3 - From ISUF“92 onwards, the forward co
38、mpatibility is ensured by the guidelines given for iture protocol enhancements and the compatibility procedure as outlined in clause 6. - With the introduction of certain procedures (e.g. number portability) backwards compatibility with ISUP procedures conforming to Recommendation 4.767 is not possi
39、ble. 2.4.2 The examples included in this Recommendation are typical only and should not be used as a definitive interworking guide. Interworking with other signalling systems or user parts 3 Table 1 lists the signalling capabilities supported by the ISDN user part for basic call. Table 2 lists the g
40、eneric signalling procedures, supplementary services and some additional hctiondservices supported by the ISDN User Part. These capabilities are categorized into two classes; internationally applicable class and national use class. These classes are defined as follows. Capabilities supported by the
41、ISDN user part Table UQ.761- Signalling capabilities for basic cal Functioniservice SpeecW3.1 kHz audio 64 kbi/s unrestricted Multirate connection types (Note) N x 64 kbi/s connection types En bloc address signalling Overlap address signalling Transit network selection Continuity check Forward trans
42、fer Simple segmentation Tones and announcements Access delivery information Transportation of user teleservice information Suspend and resume Signalling procedures for Connection type allowing fallback capability Propagation delay determination procedure Enhanced echo control signalling procedures S
43、implified echo control signalling procedures Automatic repeat attempt Blocking and unblocking of circuits and circuit groups Dual seizure Transmission alarm handling for digital inter-exchange circuits Reset of circuits and circuit groups Receipt of unreasonable signalling information circuit group
44、query National use d d d d d d .I d d .I d d d d d d d d d d d d d d - International 4 Recommendation Q.761 (12199) - Table UQ.761- Signalling capabilities for basic call (concluded) I Functiodservice Compatibility procedure Temporary trunk blocking ISDN user part signalling congestion control Autom
45、atic congestion control Interaction between N-ISDN and INAP Unequipped circuit identification code ISDN user part availability control MTP pause and resume Overlength messages Temporary Alternative Routing (TAR) Hop counter procedure Collect call request procedure Hard-to-reach Calling geodetic loca
46、tion procedure represents ITU-T support. represents ITU-T non-support. (r NOTE - Multirate connection types are 2 x 64,384, 1536 and 1920 kbit/s. National use J J J J J J J J J J J J J J International Table 2/Q.761- Generic signalling procedures, services and functions Functiodservice Zeneric signal
47、ling procedures 2nd-to-end signalling - Pass along method hd-to-end signalling - SCCP connection orientated End-to-end signalling - SCCP connectionless Generic number transfer Generic digit transfer Generic notification procedure Service activation Remote Operations Service Element (ROSE) capability
48、 Network specific facilities Pre-release information transport Application Transport Mechanism (APM) Redirection Pivot routing National use J J J J d J J J J J J .I J nternatio na1 7 - J J I - - J J J - Recommendation 4.761 (12/99) 5 Table 2/Q.761- Generic signalling procedures, services and functio
49、ns (concluded) Functiodservice Supplementary services Direct-Dialling-In (DDI) Multiple Subscriber Number (MSN) Calling Line Identification Presentation (CLIP) Calling Line Identification Restriction (CLIR) Connected Line Identification Presentation (COLP) Connected Line Identification Restriction (COLR) Malicious Call Identification (MCID) Sub-addressing (SUB) Call Forwarding Busy (CFB) Call Forwarding No Reply (CFNR) Call Forwarding Unconditional (CFU) Call Deflection (CD) Explicit Call Transfer (ECT) Call Waiting (CW) Call HOLD (HOLD) Completion
