1、STD-ITU-T RECMN Q.272b-3-ENGL 179b 48b257L Ob31324 115 INTERNATIONAL TELECOMMUNICATION UN ION ITU=T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Q.2726.3 (07/96) SERIES Q: SWITCHING AND SIGNALLING Broadband ISDN - B-ISDN application protocols for the network si g n al I i ng B-ISDN user part - Ne
2、twork generated session ide n tif er ITU-T Recommendation Q.2726.3 (Previously CCilT Recommendation) STD*ITU-T RECMN Q-272b.3-ENGL L99b qBb257L Ob31325 051 W ITU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE Q.14.3 INTERNATIONAL AUTOMATIC AND SEMI
3、-AUTOMATIC WORKING FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN Q.4-Q.59 Q. 60-Q. 99 CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS SPECIFICATION OF SIGNALLING SYSTEMS No. 4 AND No. 5 SPECIFICATIONS OF SIGNALLING SYSTEM No. 6 SPECIFICATIONS OF SIGNALLING SYSTEM RI SPECIFICATIONS OF SIGNALL
4、ING SYSTEM R2 DIGITAL EXCHANGES INTERWORKING OF SIGNALLING SYSTEMS SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 PUBLIC LAND MOBILE NETWORK INTERWORKING WITH SATELLITE MOBILE SYSTEMS INTELLIGENT NETWORK BROADBAND ISDN General aspects ATM adaptation layer Signal
5、ling network protocols Common aspects of B-ISDN application protoc network signalling and interworking Is for acc Q.IO0-Q.119 Q.120-Q.249 Q.250-(2.309 Q.310-Q.399 Q.400-Q.499 Q.500-Q.599 Q.600-Q.699 Q. 700-Q.849 Q.850-Q.999 Q. 1OOO-Q.1 O99 Q.11OO-Q.1 I99 Q. 1200-Q. I999 Q.2000-Q.2999 Q.2000-Q.2099 Q
6、.210-Q.2199 Q.2200-Q.2599 ignalling and Q.2600-Q.2699 B-ISDN application protocols for access signalling Q.2900-Q.2999 For further details, please refer to ITU-T List of Recommendations. STD-ITU-T RECMN Q.272b-3-ENGL L7b m 4b2571 Ob3132b T7 ITU-T RECOMMENDATION 4.2726.3 B-ISDN USER PART -NETWORK GEN
7、ERATED SESSION IDENTIFIER , I I Summary This Recommendation specifies the extensions to the Broadband ISDN User Pari to support the network-generated session identifier. Source ITU-T Recommendation Q.2726.3 was prepared by ITU-T Study Group 11 (1993-1996) and was approved under the WTSC Resolution N
8、o. 1 procedure on the 9th of July 1996. STD-ITU-T RECMN Q.2726-3-ENGL L77b 4b259L Ob3L327 929 = 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 or
9、gan 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 Telecornmunication Standardization Conference (WTSC), which meets every four years, esta
10、blishes 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
11、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 recognized operating agency. INTELLECTUAL PROPERTY RIGHTS The
12、 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 of claimed Intellectual Property Rights, whether asserted by I
13、TU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, the ITU hadhad not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned th
14、at this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. O IT 1997 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,
15、without permission in writing from the ITU. 11 Recommendation 4.2726.3 (07/96) CONTENTS Page . 3 Network call correlation identifier 1 3.1 Overview 3.1.1 Scope . 3.1.2 References . 3.1.3 Abbreviations B-ISDN User Part Messages and Parameters . 3.2.1 Definitions . 3.2.2 Messages . 3.2.3 Formats 3.3 A
16、pplication Process Procedures . 3.4 Application Service Elements and Primitives 3.2 3.4.1 3.4.2 Primitives Between SACF and Application Process . Primitives between CC ASE and SAC 3.4.3 ASE descriptions . 2 . 3.5 Interworking 6 3.5.1 Interworking with CS-1 Nodes 6 . 3.5.2 Interworking with ISUP 7 3.
17、5.3 Interworking with DSS 2 7 . . . Appendix I Setting of instruction indicators 7 . Recommendation Q.2726.3 (07196) 111 STD*ITU-T RECMN Q-272b-3-ENGL 1976 i8b2571 Ob3L329 7T7 m Recommendation 4.2726.3 B-ISDN USER PART - NETWORK GENERATED SESSION IDENTIFIER (Geneva, 1996) 3 Network call correlation
18、identifier 3.1 Overview 3.1.1 Scope This Recommendation defines a Network Call Correlation Identifier for a call between the user and the network. It can be used to correlate records at multiple exchanges within a network, e.g. for accounting purposes. The identifier is not used to trigger real-time
19、 processing at a receiving exchange. I 3.1.2 References The following ITU-T Recommendations and 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
20、and other references are subject to revision; all users of this Recommendation are therefore encouraged 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 publis
21、hed. i ITU-T Recommendation 4.2763 (1995), Signalling System No. 7 B-ISDN User Part (B-ISUP) - Formats and codes. 3.1.3 Abbreviations This Recommendation uses the following abbreviation. MLPP Multi-Level Precedence and Preemption 3.2 B-ISDN User Part Messages and Parameters 3.2.1 Definitions This Re
22、commendation defines the following terms. 3.2.1.1 network call correlation identifier: Circuit independent information identifjing a particular call for the purpose of correlating call related information at different exchanges. 3.2.1.2 connection identifier: Information identifjing a specific conne
23、ction within a call on an end-to-end basis. 3.2.2 Messages The following tables show the impact of the new parameters on message coding. Recommendation Q.2726.3 (07/96) 1 STD-ITU-T RECMN Q-272b-3-ENGL 179b 1i8b2591 Ob31330 419 = 3.2.2.1 IAM The IAM contains the following additional parameters (see T
24、able 3-1): Table 3-UQ.2726.3 - Additional Parameters to be included in the IAM Connection Identifier 3.2.2.2 ACM The ACM contains the following additional parameter (see Table 3-2): Table 3-2/Q.2726.3 - Additional Parameter to be included in the ACM ACM I Connection Identifier I 3.2.2.3 ANM The ANM
25、contains the following additional parmeter (see Table 3-3): Table 3-3/Q.2726.3 - Additional Parameter to be included in the ANM ANM Connection Identifier 3.2.3 Formats 3.2.3.1 Network Call Correlation Identifier The format of the Network Call Correlation Identifier parameter field is shown in Figure
26、 3-1. The parameter name code allocated to the Network Call Correlation Identifier parameter is O110 1000. 2 Recommendation 4.2726.3 (07/96) 8 7 6 I I I 5 4 3 2 1 3d NI digit 1 4h NI digit lNI digit 2“d NI digit Figure 3-UQ.2726.3 - Network Call Correlation Identifier parameter The following codes a
27、re used in the subfields of the Network Call Correlation Identifier parameter field: a) Network identity (octets 1 and 2) Coding as specified for the MLPP precedence parameter sub-field in Recommendation 4.2763. b) Point code Point code of the exchange generating the Network Call Correlation Identif
28、ier. Bit 1 of octet 3 is the least significant bit and bit 8 of octet 5 is the most significant bit. Unused bits shall be coded as Os. NOTE - This format supports a 3-octet field for the point code of the generating node to allow for national point code arrangements. International point code would u
29、se octet 3 and bits 1 to 6 of octet 4. c) Call Identifier A bit string representing the identification allocated to the call. 3.2.3.2 Connection Identifier The format of the Connection Identifier parameter field is shown in Figure 3-2. The parameter name code allocated to the Connection Identifier p
30、arameter is O1 10 1001. Recommendation 4.2726.3 (07196) 3 STD-ITU-T RECMN Q-272b-3-ENGL L99b 48b257L Ob31332 271 Figure 3-2/Q.2726.3 - Connection Identifier parameter field The following codes are used in the sub-fields of the Connection Identifier parameter field: a) Connection IdentiJier A bit str
31、ing representing the identification allocated to the connection within a call. 3.3 Application Process Procedures a) Originating Exchange The Set-up request primitive may include Network Call Correlation Identifier. The algorithm used to allocate Network Call Correlation Identifier to the call is im
32、plementation dependent. However, every call must be assigned a unique Network Call Correlation Identifier that is also unique over a sufficiently long time period. In other words, the exchange should sequence through a broad range of call identifier values before reusing a value. The exchange, for i
33、nstance, cannot immediately reuse a call identifier value for another call. For a multiconnection call for which a Network Call Correlation Identifier has been generated, the Set-up request primitive shall also include a Connection Identifier. The Connection Identifier value shall uniquely identi th
34、e connection, within the context of the call. For a point-to-multipoint call, the Set-up request primitive for additional parties shall include the same Network Call Correlation Identifier as for the first leaf party. The exchange may store the Network Call Correlation Identifier for the duration of
35、 the call for recording call related information and shall release it when the call is released. b) Intermediate Exchange The intermediate exchanges may store the Network Call Correlation and Connection Identifiers for the duration of the call for recording call related information and shall release
36、 them when the call is released. The intermediate exchanges shall pass these parameters unaltered. If an intermediate exchange does not receive a Network Call Correlation Identifier for a point-to-point call, it may generate a Network Call Correlation Identifier and include it in the Set-up request
37、primitive issued. 4 Destination Exchange The destination exchange may store the Network Call Correlation and Connection Identifiers for the duration of the call for recording call related information and shall release them when the call is released. Recommendation 4.2726.3 (07/96) - STD-ITU-T RECMN
38、Q-272b.3-ENGL L99b 48b2571 Ob31333 128 Set-up Requesflndication Network Call Correlation Identifier Connection Identifier d) Addition of connections to a multconnection call For a call for which a Network Call Correlation Identifier has been generated: 1) For connections added by the calling party,
39、the Set-up request primitive shall include a Connection Identifier. The Connection Identifier value shall uniquely identi the connection, within the context of the call. B-ISDN N-ISDN O O O O For connections added by the called party the Set-up request primitive shall not include the Connection Iden
40、tifier parameter. When the corresponding Set-up indication primitive is received at the call origination exchange, the generated Address - Complete request primitive or Answer request primitive shall include the Connection Identifier for this added connection. The intermediate exchanges may store th
41、e Connection identifier for the duration of the connection for recording call related information and shall release it when the connection is released. The intermediate exchanges shall pass this parameter unaltered. The destination exchange may store the Connection Identifier received in the Address
42、-Complete indication primitive or Answer indication primitive for the duration of the connection for recording call related information and shall release it when the connection is released. Address-Complete Requesflndication Connection Identifier 3.4 The following primitives are affected. Applicatio
43、n Service Elements and Primitives B-ISDN N-ISDN O O 3.4.1 Primitives Between SACF and Application Process 3.4.1.1 Set-up RequestAndication Primitive Table 3-4 shows parameters that must be added to the Set-up Requesflndication primitive. 3.4.1.2 Addresscomplete Requesthdication Primitive Table 3-5 s
44、hows parameter that must be added to the AddressComplete Requesthdication primitive. Table 3-5/Q.2726.3 - Parameter for Address-Complete Requesthdication Primitive Recommendation 4.2726.3 (07/96) 5 5TD.IT.J-T RECMN Q.272b.3-ENGL 199b = llb259L Ob3133Y Obll 3.4.1.3 Answer Requestfindication Primitive
45、 Table 3-6 shows parameter that must be added to the Answer Requestnndication primitive. Answer RequestlIndication Connection Identifier Table 34Q.2726.3 - Parameter for Answer Requesthdication Primitive B-ISDN N-ISDN O O 3.4.2 Primitives between CC ASE and SAC 3.4.2.1 Table 3-7 shows new parameters
46、 that must be added to the Call-Set-up Requesflndication primitive. Call - Set Up Requestnndication Primitive Table 3-7/Q.2726.3 - Parameters for Callset-Up Requestnndication Primitive Call-Set-up Requesflndication Network Call Correlation Identifier Connection Identifier 3.4.2.2 Call-Address-Comple
47、te requesthdication primitive Table 3-8 shows new parameter that must be added to the CallAddress-Complete requestindication primitive. Table 3-WQ.2726.3 - Parameter for Call - Address-Complete request/indication primitive Call-Address-Complete requesthndication Connection identifier 3.4.2.3 Call-An
48、swer Requestnndication Primitive Table 3-9 shows new parameter that must be added to the Call-Answer Request/Indication primitive. Table 3-9/Q.2726.3 - Parameter for Call-Answer Requesthdication Primitive Call-Answer Requesthdication Connection identifier 3.4.3 ASE descriptions No changes are requir
49、ed to the ASE descriptions for BCC or CC ASES. 3.5 Interworking 3.5.1 Interworking with CS-1 Nodes The instruction indicators are set so as to pass on these parameters at a CS-1 node. The setting of the instruction indicators is shown in Appendix I. 6 Recommendation Q.2726.3 (07/96) - STD-ITU-T RECMN Qo272b-3-ENGL 177b M gAb259l1 Ob31335 TTO = 3.5.2 Interworking with ISUP The instruction indicators are set so as to discard these parameters at an interworking node. Parameter Network Call Correlation Identifier 3.5.3 Interworking with DSS 2 T
