1、INTERNATIONAL TELECOMMUNICATION UNION ITU=T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Q.2982 SERIES Q: SWITCHING AND SIGNALLING Broadband ISDN - B-ISDN application protocols for access signalling (1 2/99) Broadband integrated services digital network (B-ISDN) - Digital subscriber signalling No
2、. 2 (DSSZ) - Q.2931 -based separated call control protocol ITU-T Recommendation Q.2982 (Previously CCITT Recommendation) INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Q.2982 SERIES Q: SWITCHING AND SIGNALLING Broadband ISDN - B-ISDN application protocols
3、 for access signalling (1 2/99) Broadband integrated services digital network (B-ISDN) - Digital subscriber signalling No. 2 (DSSZ) - Q.2931 -based separated call control protocol ITU-T Recommendation Q.2982 (Previously CCITT Recommendation) ITU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALLING SI
4、GNALLING IN THE INTERNATIONAL MANUAL SERVICE INTERNATIONAL AUTOMATIC AND SEMI-AUTOMATIC WORKING FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS SPECIFICATIONS OF SIGNALLING SYSTEMS No. 4 AND No. 5 SPECIFICATIONS OF SIGNALLING SYSTEM R1 Q.310-Q.39
5、9 SPECIFICATIONS OF SIGNALLING SYSTEM R2 Q.400-Q.499 DIGITAL EXCHANGES Q.500-Q.599 INTERWORKING OF SIGNALLING SYSTEMS Q .60O-Q. 699 SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 Q.70O-Q.849 DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 Q.85O-.999 PUBLIC LAND MOBILE NETWORK Q. I 000-Q. 1 O99 INTERWORKING WI
6、TH SATELLITE MOBILE SYSTEMS Q.1100-Q.1199 INTELLIGENT NETWORK Q.1200-Q.1699 SIGNALLING REQUIREMENTS AND PROTOCOLS FOR IMT-2000 Q.1700-Q.1799 BROADBAND ISDN Q.2000-Q.2999 General aspects Q.2000-Q.2099 Signalling ATM adaptation layer (SAAL) Q.2100-Q.2199 Signalling network protocols Q.2200-Q.2299 Comm
7、on aspects of B-ISDN application protocols for access signalling and network Q.2600-Q.2699 signalling and interworking B-ISDN application protocols for the network signalling Q.2700-Q.2899 B-ISDN application protocols for access signalling Q.2900-4.2999 Q.I-Q.3 Q.4-Q.59 Q.60-Q.99 Q.100-Q.119 Q. 1204
8、.249 SPECIFICATIONS OF SIGNALLING SYSTEM No. 6 Q.250-Q.309 For further details, please refer to ITU-T List of Recommendations. ITU-T RECOMMENDATION 4.2982 BROADBAND INTEGRATED SERVICES DIGITAL NETWORK (B-ISDN) - DIGITAL SUBSCRIBER SIGNALLING NO. 2 (DSS2) - Q.2931-BASED SEPARATED CALL CONTROL PROTOCO
9、L Summary This Recommendation belongs to the DSS2 fmily of ITU-T Recommendations and specifies extensions to Recommendation 4.293 1 to specify the additional DSS2 protocol elements (messages, information elements, procedures and functions) required to support the separated control (establishment and
10、 clearing) of a point-to-point call. This 4.293 1-based separated call control protocol requires the use of the bearer control protocol defined in Recommendation 4.2983 to add and remove bearers to/f-om the call. Source ITU-T Recommendation 4.2982 was prepared by ITU-T Study Group 11 (1997-2000) and
11、 was approved under the WTSC Resolution No. 1 procedure on 3 December 1999. Keywords Bearer control, call control, separation. Recommendation Q.2982 (12/99) i FOREWORD ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommunications. The ITU Tel
12、ecommunication Standardization Sector (ITU-T) is a permanent organ of 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 Standar
13、dization Conference (WTSC), which meets every four years, establishes 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.
14、 1. In some areas of information technology which fall within ITU-Ts 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
15、 recognized operating agency. INTELLECTUAL PROPERTY RIGHTS The ITU draws 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
16、of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, the ITU had received notice of intellectual property, protected by patents, which may be required to implement this
17、 Recommendation. However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. O ITU 2000 Ail rights reserved. No part of this publication may be reproduced or utilized in any form M by any means, electroni
18、c or mechanical, including photocopying and microfilm, without permission in writing from the ITU. ii Recommendation 4.2982 (12/99) CONTENTS 1 Scope Page 1 2 References . 3 Definitions . 4 Abbreviations 5 Description Application to interface structure . 5.1 5.2 Capabilities supported by this Recomme
19、ndation . 6 Operational requirements . 6.1 Provision and withdrawal . 6.2 Requirements on the originating network side 6.3 Requirements on the destination network side 7 Primitive definitions and state definitions 7.1 Primitive definitions . 7.2 State definitions . 7.2.1 Call states . 7.2.2 Bearer s
20、tates . 8 Coding requirements 8.1 Messages for separated call control 8.1.1 ALERTING 8.1.2 CALL PROCEEDING 8.1.3 CONNECT . 8.1.4 CONNECT ACKNOWLEDGE 8.1.5 RELEASE 8.1.6 RELEASE COMPLETE . 8.1.7 CALL SETUP 8.1.8 STATUS 8.1.9 STATUS ENQUIRY 8.1.10 NOTIFY . 8.2 Informat ion elements . 8.2.1 Message typ
21、e 8.2.2 Call identifier 8.2.3 Call capability . 9 9.1 Signalling procedures at the coincident SB and TB reference point Establishment of a separated call at the originating interface . 9.1.1 Call request . Recommendation 4.2982 (12199) 1 2 2 4 4 4 4 4 4 4 4 4 5 5 5 5 5 5 6 iii ! 9.2 9.3 9.4 9.5 9.6
22、9.7 10 11 12 13 14 9.1.2 Invalid call control information . 9.1.3 Call proceeding 9.1.4 Call confirmation indication . 9.1.5 Call acceptance . 9,1.6 Call rejection . Call establishment at the destination interface . 9.2.1 Incoming call request 9.2.2 Call confirmation 9.2.3 Call acceptance . 9.2.4 Ac
23、tive indication . Call clearing . 9.3.1 Exception conditions . 9.3.2 Call clearing initiated by the user . 9.3.3 Clearing initiated by the network . 9.3.4 Call clearing collision 9.3.5 Interaction between call control and bearer control Restart procedures . Handling of error conditions Error procedu
24、res with explicit action indication . Notification procedures Signalling procedures at the TB reference point Interworking with other networks Interactions with supplementary services Parameter values Dynamic description SDLs . Annex A - Additional procedures for pre-negotiation (Optional) Appendix
25、I - Additional procedures for simultaneous establishment of the first bearer with the Ca l.,.,. State definitions . I. 1 1.2 Coding requirements 1.2.1 Messages 1.3 Procedures . 1.3.1 Simultaneous Cali and bearer establishment 1.3.2 First bearer clearing 1.3.3 Call clearing iv Recommendation Q.2982 (
26、12/99) - - Page Appendix II - Protocol model and related entities . 17 II. 1 Field of application 11 11.3 Object identifiers Appendix III - Guidelines for the use of the instruction indicator Appendix IV - Examples of message flows for separated call and bearer control 11.2 Call and Bearer control p
27、rotocols in the DSS2 architecture 17 18 19 19 Recommendation 4.2982 (12/99) V = 48b25911 Obb078 b7b Recommendation 4.2982 BROADBAND INTEGRATED SERVICES DIGITAL NETWORK (B-ISDN) - DIGITAL SUBSCRIBER SIGNALLING NO. 2 (DSS2) - Q.2931-BASED SEPARATED CALL CONTROL PROTOCOL (Geneva, 1999) 1 Scope This Rec
28、ommendation specifies the procedures for establishing, maintaining and clearing calls in a separated call and bearer control environment. Only point-to-point call control is specified in this Recommendation. The call control protocol defined in this Recommendation is based on the 4.293 1 i callconne
29、ction basic call control protocol with the relevant extensions and adaptations needed to enable the control of a call independently of the bearers, which can be subsequently added to the call and dropped fiom the call through the use of a bearer control protocol which is the subject of a separate Re
30、commendation. The procedures specified by this Recommendation are applicable at the TB reference point or coincident SB and TB reference point as defined in Recommendation 1.413 2 by means of the Digital Subscriber Signalling System No. 2 (DSS2). The 4.293 1 -based separated call control protocol de
31、fined by this Recommendation is applicable to control calls independently of bearers, which are controlled and associated separately to an existing call by means of the separated bearer control protocol defined by Recommendation 4.2983 3. 2 References The following IT-T Recommendations and other ref
32、erences contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the edtions indicated were valid. All Recommendations and other references are subject to revision; all users of this Recommendation are therefore encouraged to
33、 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. Pl E21 131 141 151 161 i71 ITU-T Recommendation 4.293 1 (1999, Digital subscriber signalling system N
34、o. 2 - User- network interface (rnvl) layer 3 specijcation for basic call/connection control. ITU-T Recommendation 1.4 13 (1 993), B-ISDN user-network interface. ITU-T Recommendation 4.2983 ( 1 999), Broadband integrated services digital network (B-ISDN) - Digital subscriber signalling system No. 2
35、(DSS2) - Bearer control protocol. ITU-T Recommendation 1.327 (1 993), B-ISDN functional architecture. ITU-T Recommendation 4.2130 (1994), B-ISDN signalling ATM adaptation layer - Service specijc coordination function for support of signalling at the user-network interface (SSCF at mI). ITU-T Recomme
36、ndation 4.2984 (1 999), Broadband integrated services digital network (B-ISDN) and broadband private integrated services network (B-PISN) - Pre-negotiation. ITU-T Recommendation 4.2941.1 (1997), Digital subscriber signalling system No. 2 - Generic identifier transport. Recommendation 4.2982 (12/99)
37、1 48b259l1 Obb7077 502 8 ITU-T Recommendation 4.2932.1 (1996), Digital subscriber signalling system No. 2 - Generic functional protocol: Core functions. 3 Definitions This Recommendation defines the following terms: 3.1 call. 3.2 effect the control of a bearer, that bearer being part of a call. 3.3
38、that participates in bearer control. 3.4 communicate through one or more networks. 3.5 the control of a call. 3.6 participates in call control. bearer: A connection for the transport of user plane information between users involved in a bearer control: Functionality and signalling in and between net
39、works and terminals to bearer control entity (BC entity): An entity that is located in a terminal or a network and caii: An association between two or more users using a telecommunication service to call control: Functionality and signalling in and between networks and terminals to effect call contr
40、ol entity (CC entity): An entity that is located in a terminal or a network and that 4 Abbreviations This Recommendation uses the following abbreviations: AAL ATM Adaptation Layer ATM Asynchronous Transfer Mode BC Bearer Control B-ISDN cc Call Control DSS2 SAAL Signalling ATM Adaptation Layer SDL Sp
41、ecification and Description Language TE UNI User-Network Interface Broadband Integrated Services Digital Network Digital Subscriber Signalling System No. 2 Terminal Equipment (see Recommendation 1.327 4) 5 Description 5.1 Application to interface structure The Call control protocol specified in the
42、present Recommendation applies to the interface structures defined in Recommendation 1.413 2. It uses the functions and services provided by layer 2. This layer 3 protocol requests the services of the underlying layer (SAAL) and receives information from it using the primitives defined in Recommenda
43、tion 4.2130 5. These primitives are used to illustrate the communication between the protocol layers and are not intended to speci% or constrain implementat ions. 2 Recommendation 4.2982 (12/99) .P 48b2591 Obb9080 221.i 5.2 This Recommendation specifies the procedures, messages and information eleme
44、nts needed for I establishing, maintaining and clearing a call separately and independently f-om the control of the bearers that may exist within the context of that call. Only the point-to-point call is covered by this Recommendation. This Recommendation builds upon the capabilities defined in Reco
45、mmendation Q.293 1 11 (see 1.514.293 1). When the call has been initiated or has progressed to the active state, one or more bearers can be added to, respectively released fiom, the call by successive bearer establishment requests, respectively bearer release requests rom the calling party or the ca
46、lled party, using the procedures defined in Recommendation 4.2983 3. Bearers may be established or released fiom the call at any time after the establishment request has been indicated to be in progress, and before call clearing has been initiated. Bearer capability pre-negotiation may, optionally,
47、be invoked before a given bearer establishment is initiated, using the pre-negotiation protocol defined in Recommendation 4.2984 6. Annex A specifies additional protocol requirements to enable, as a user option applicable when the capability is provided as a network option, the bearer pre-negotiatio
48、n prior to a corresponding subsequent bearer establishment. Appendix I specifies the additional protocol requirements that would enable the simultaneous establishment of the call and of the first bearer associated to the call being established. Appendix I identifies the additional protocol requireme
49、nts that would enable (by inheritance - No. 3 “no route to destination“; - - No. 22 “number changed“; or No. 28 “invalid number format (address incomplete)“. 9.1.3 Caii proceeding If the network can determine that access to the requested service is authorized and available, the network shall send a CALL PROCEEDING message to the user to acknowledge the CALL SETUP message and to indicate that the call is being processed and enter the Outgoing Call Proceeding state. When the user receives the CALL PROCEEDING message, the user shall stop timer T303, start
