ITU-T Q 2941 1-1997 Digital Subscriber Signalling System No 2 - Generic Identifier Transport Series Q Switching and Signalling Broadband ISDN - B-ISDN Application Protocols for Acc.pdf

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1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Q.2941 .I SERIES Q: SWITCHING AND SIGNALLING Broadband ISDN - B-ISDN application protocols for access signalling (09/97) Digital subscriber Signalling System No. 2 - Generic identifier transport ITU-T Recomme

2、ndation Q.2941 .I (Previously CCITT Recommendation) COPYRIGHT International Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling ServicesITU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE INTERNATIONAL AUTOMATIC AND SEMI-

3、AUTOMATIC WORKING FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS SPECIRCATIONS OF SIGNALLING SYSTEMS No. 4 AND No. 5 SPECIFICATIONS OF SIGNALLING SYSTEM No. 6 SPECIFICATIONS OF SIGNALLING SYSTEM R 1 SPECIFICATIONS OF SIGNALLING SYSTEM R2 DIGITAL

4、 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 Signalling ATM adaptation layer (SAAL) Signallin

5、g network protocols Common aspects of B-ISDN application protocols for access signalling and network signalling and interworking B-ISDN application protocols for the network signalling B-ISDN application protocois for access signailing Q.1-Q.3 Q.4-Q.59 Q .60-Q.99 Q.lOO-Q.119 Q. 1204.249 Q.250-Q.309

6、Q.310-Q.399 Q.400-Q.499 Q.SOO-Q.599 Q.600-Q.699 Q.700-Q.849 Q.SSO-Q.999 Q.1000-Q.1099 Q.1 lOO-Q.1199 Q. 12004.1999 Q.2000-Q.2999 Q .2000-Q.2099 Q.2 1004.21 99 4.22004.2299 Q.2600-Q.2699 Q.2700-Q.2899 Q.2900-Q.2999 For further details, please refer to ITU-T List of Recommendations. COPYRIGHT Internat

7、ional Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling ServicesITU-T RECOMMENDATION 4.2941.1 DIGITAL SUBSCRIBER SIGNALLING SYSTEM NO. 2 - GENERIC IDENTIFIER TRANSPORT Summary This Recommendation describes the DSS 2 generic identifier transport capability. This capabili

8、ty allows the transport through the B-ISDN of identifiers required and used by various distributed applications, This Recommendation is applicable to equipment, supporting DSS 2 signalling capabilities as defined, in particular, in Recommendations Q.2931 i and Q.2971 2, attached at either side of a

9、TB reference point or coincident SB and TB reference point when used as an access to the public B-ISDN. This DSS 2 signalling capability allows to car;y identifiers between a call originating entity (e.g a calling user) and an addressed entity (e.g. a remote user, or an interworking unit or a high l

10、ayer function node addressed by the calling user). The identifiers are transmitted unchanged through the network and they are used by various distributed applications. This signalling capability is a means of end-to-end signalling using identifiers having a specific purpose which the network can opt

11、ionally access but not change. In some cases the network may create an identifier on behalf of the user or at its request. Source ITU-T Recommendation Q.2941.1 was prepared by ITU-T Study Group Il (1997-2000) and was approved under the WTSC Resolution No. 1 procedure on the 12th of September 1997. R

12、ecommendation 4.2941.1 (09/97) i - - COPYRIGHT International Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling ServicesFOREWORD ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommuni- cations. The ITU Telecommuni

13、cation 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 Standardization

14、 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. 1. In s

15、ome 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 recogni

16、zed 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 of claim

17、ed 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 not received notice of intellectual property, protected by patents, which may be required to implement this Rec

18、ommendation. 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 1998 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic o

19、r mechanical, including photocopying and microfilm, without permission in writing from theITU. 11 Rccornmendation 4.2941.1 (09/97) COPYRIGHT International Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling Services. STD*ITU-T RECMN Q.274L-L-ENGL 1777 I 48b257L Ob114874 7

20、25 = CONTENTS Scope . References . . Definitions . Abbreviations . . Description . Operation requirements Primitives Coding requirements 8.1 Messages . 8.2 Information element . General procedures . Callkonnection or add party establishment 9.2 Call/connection clearing party dropping or rejection 9.

21、3 Handling of exceptional conditions . . 9.1 Appendix I . Examples of coding of the Generic identifier transport information element . 1.1 1.2 Example of DSM-CC resourceId coding Example of H.310 correlationID coding . Recommendation Q.2941.1 (09/97) Page 1 1 1 2 2 2 2 2 2 2 4 5 5 5 6 6 7 . 111 . CO

22、PYRIGHT International Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling ServicesRecommendation Q.2941.1 DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 2 - GENERIC IDENTIFIER TRANSPORT (Geneva, 1997) 1 Scope This Recommendation specifies the generic identifier transport signal

23、ling capability for the Broadband Integrated Services Digital Network (B-ISDN) by means of the Digital Subscriber Signalling System No. 2 (DSS 2) protocol. This capability allows to cany identifiers unchanged between a call originating entity (eg a calling user) and the addressed entity (e.g. a remo

24、te user, or an interworking unit or a high layer function node addressed by the calling user). This Recommendation is part of the DSS 2 family of ITU-T Recommendations; it specifies extensions to Recommendations 4.2931 i and Q.2971 2 and does not repeat states, information elements, messages and pro

25、cedures contained therein, but only specifies extensions related to the use of the Generic identifier information element. This Recommendation is applicable to equipment. supporting DSS 2 signalling capabilities as defined, in particular, in Recommendations Q.2931 I and 4.2971 2, attached at either

26、side of a TB reference point or coincident SB and TB reference point when used as an access to the public B-ISDN. 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

27、of publication, the editions indicated were valid. All Recommendations 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.

28、A list of the currently valid ITU-T Recommendations is regularly published. ITU-T Recommendation Q.293 1 ( 1995), Digital subscriber Signalling System No. 2 - User-Network Interface (UNI) layer 3 speclfication for basic caWconnection control. 3 ITU-T Recommendation Q.297 1 ( 19951, Digital subscribe

29、r Signalling System No. 2 - User-network interface layer 3 specqcation for point-to-multipoint call/connection control, ITU-T Recommendation H.245 ( 1996), Confrol protocol for multimedia communication. ISOAEC DIS 1381 8-6, Information technologv - Generic coding of moving pictures and associated au

30、dio information - Part 6: Extensions for digital storage media command and control. ITU-T Recommendation H.3 1 O ( 1996), Broadband audiovisual communication systems and terminals. Definitions No new definitions are required. 1 Recommendation 4.2941.1 (09/97) - - COPYRIGHT International Telecommunic

31、ations Union/ITU TelecommunicationsLicensed by Information Handling ServicesSTD*ITU-T RECMN Q*274I-L-ENGL I4777 = q8b2571 Ob41187b 7TB 4 Abbreviations This Recommendation uses the following abbreviations: DSM-CC GIT Generic Identifier Transport Digital Storage Media - Command and Control 5 Descripti

32、on The Generic Identifier Transport (GIT) signalling capability allows the generation and transport across the B-ISDN identifiers used by different distributed applications. The generic identifier transport capability is a means of end-to-end signalling using identifiers having a specific purpose wh

33、ich the network can optionally access but not change. 6 Operation requirements Some networks may provide this capability only by subscription to the calling and called users . 7 Primitives No new primitives are required to support this capability. 8 Coding requirements 8.1 Messages The Generic ident

34、ifier transport information element may be included in the following messages of global significance: - SETUP; - CONNECT; - ALERTING; - ADDPARTY; - PARTY ALERTING; - ADD PARTY ACK when the CONNECT message at the leaf imerface is mapped into the ADD PARTY ACK message at the root interface; - ADD PART

35、Y REJECT It may be included in the RELEASE message and RELEASE COMPLETE if it is the first release message It may be included in the DROP PARTY message and DROP PARTY ACK if it is the first message to drop a party. 8.2 Information element The following additional DSS 2 information element is require

36、d to support the generic identifier transport capability 8.2.1 Generic identifier transport information element The Generic identifier transport information element is used to carry identifiers unchanged between a call originating entity (e.g. a calling user) and the addressed entity (e.g. a remote

37、user, or an interworking unit or a high layer function node addressed by the calling user). The Generic identifier transport information element may be repeated in a message. The number of instances is limited to three and the maximum length is 33 octets. The Generic identifier transport infomation

38、element is defined in Figure 1 and Table 1. 2 Recommendation Q.2941.1 (09/97) COPYRIGHT International Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling ServicesSTDmITU-T RECMN Q-274L.L-ENGL 1777 48b2571 Ob44877 b34 1 ext. IE instruction field Coding standard Flag Res. I

39、E action ind. Octets Identifier type Identifier length Identifier value NOTE - Octet group 6 can be repeated to form new octet groups numbered I sequentially octet I group 7, 8, ., N. Figure l/Q.2941.1 - Generic identifier transport information element 1 2 3 4 5 6 (Note) 6.1 6.2 6.m N N.l N.2 N.n 3

40、Recommendation 4.2941.1 (09/97) COPYRIGHT International Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling ServicesTable UQ.2941.1 - Generic identifier transport information element Identifier related standardlapplication (octet 5) (Note I) 1 Bits 8765432 1 0000000 1 000

41、0001 o All other values are reserved. Digital Storage Media - Command and Control (DSM-CC) resourceld (ISOiEC DIS 13818-6) (Note 2) Recommendation H.310 (Note 3) NOTE 1 - Each application requiring a different seUstructure of identifiers (coded in octet group 6 and possibly in subsequent octet group

42、s) should use the appropriate value in octet 5. NOTE 2 - When the identifier related standardapplication field is coded as DSM-CC (ISOiEC DIS 13818-6), an octet group specifies DSM-CC sessionld and another octet group specifies the resourceNum. The format is defined in NOTE 3 - When the Identifier r

43、elated standardapplication field is coded as Recommendation H.310, octet group 6 contains H.310 CorrelationID as defined in Recommendation H.310 5. Identifier tjpe, length and content (octet group 6 and possibly subseqzient octet groups) Octet group 6 is used to define an identifier or one part of a

44、n identifier composed of multiple parts. When an identifier is structured and consists of more than one part, octet group 6-contains one part of the identifier and each successive octet group starting with octet group 7 is used to code one additional part of the identifier. When an identifier consis

45、ts of only one part, this part is coded integrally in octet group 6. When an identifier consists of multiple parts this Recommendation does not specify an order for usage of the octet groups starting with octet group 6. Some standardshpplications using this Recommendation can specify an ordering of

46、the octet groups, but this is not necessary because each octet group has its own identifier type coded in the first octet of the octet group. NOTE 4 - In the future additional parts may be added to an identifier defined for an existing application resulting in the addition of appropriate octet group

47、s. Identifier tjpe (octet 6, 7, . N) (Note 5) ISOIIEC DIS 13818-6 4. Bits 87654321 0000000 1 Session (Note 6) 000000 1 o All other values are reserved. Resource (Note 7) NOTE 5 - The value coded in the identifier type field is independent of the identifier related standardlapplication field (octet 5

48、). For example, when the identifier type field is coded as session “00000001“, it refers to a session identifier regardless of the coding of octet 5. However, the format of the identifier value is dependent on the value specified in octet 5. NOTE 6 - When the identifier type is coded as session, a s

49、ession identifier shall be coded in the identifier value field of the octei group. The maximum length is 20 octets. NOTE 7 -When the identifier type is coded as resource. a resource identifier shall be coded in the identifier value field of the octe group. The maximum length is 4 octets. Identifier engfh: A binary number indicating the length in octets of the identifiefcoded in the subsequent octets of the octet group. Identifier value: Value of an identifier coded according to the Recommendation or the Standard identified in octet 5. 9 General procedures