ITU-T Q 2941 2-1999 Digital Subscriber Signalling System No 2 (DSS2) - Generic Identifier Transport Extensions Series Q Switching and Signalling Broadband ISDN - B-ISDN Application 11.pdf

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1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Q.2941.2 (1 2/1999) SERIES Q: SWITCHING AND SIGNALLING Broadband ISDN - B-ISDN application protocols for access signalling Digital subscriber signalling system No. 2 (DSS2) - Generic identifier transport exte

2、nsions ITU-T Recommendation Q.2941.2 (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 SERVICE FUNCTIONS AND IN

3、FORMATION 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 RI SPECIFICATIONS OF SIGNALLING SYSTEM R2 DIGITAL EXCHANGES INTERWORKING OF SIGNALLING SYSTEMS SPECIFICATIONS OF SIGNALLING SYST

4、EM No. 7 DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. PUBLIC LAND MOBILE NETWORK INTERWORKING WITH SATELLITE MOBILE SYSTEMS INTELLIGENT NETWORK BROADBAND ISDN General aspects Signalling ATM adaptation layer (SAAL) Signalling network protocols Common aspects of B-ISDN application protocols for access sig

5、nalling and network signalling and interworking B-ISDN application protocols for the network signalling INTERNATIONAL AUTOMATIC AND SEM I-AUTOMATI C WORKING CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS SIGNALLING REQUIREMENTS AND PROTOCOLS FOR IMT-2000 - - B-ISDN application protocols for access sig

6、nalling Q.1-Q.3 Q .4-Q 59 Q.60-Q.99 Q.100-Q.119 Q. 1 20-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 Q.850-Q.999 Q. 1 000-Q. 1 O99 Q.1100-Q.1199 Q. 1 200-Q. 1 699 Q. 1 700-Q. 1 799 Q.2000-Q.2999 Q.2000-Q.2099 Q.210O-Q.2199 Q.2200-Q.2299 Q.2600-Q.2699 Q. 2700-Q .28

7、99 For further details, please re$er to the list of ITD-T Recommendations. COPYRIGHT International Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling ServicesITU-T Recommendation 4.2941.2 Digital subscriber signalling system No. 2 (DSS2) - Generic identifier transport ex

8、tensions Summary This Recommendation defines the use of DSS2 Generic identifier transport signalling capability to carry H.321 and H.310 End Station Identifier, H.245 portNumber, ATM VCC Identifier, ATM signalling VCC identifier, Internet related Identifiers and MPOA VPN Identifier. Instances of the

9、se identifiers may be carried in the Generic identifier transport information element as defined in Recommendation 4.2941.1. Source ITU-T Recommendation 4.2941.2 was prepared by ITU-T Study Group 11 (1997-2000) and approved under the WTSC Resolution 1 procedure on 3 December 1999. ITU-T 4.2941.2 (12

10、/1999) 1 COPYRIGHT International 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 Sec

11、tor (ITU-T) is a permanent organ 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 ev

12、ery four years, establishes the 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 purvi

13、ew, 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 ITU draws atten

14、tion to the possibility that the 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

15、 outside of the Recommendation 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 t

16、he latest information and are therefore 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 writ

17、ing fi-om the ITU. 11 ITU-T 4.2941.2 (12/1999) COPYRIGHT International Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling ServicesCONTENTS 1 2 3 4 5 5.1 5.2 5.3 5.4 5.5 5.6 6 7 8 8.1 8.2 9 9.1 9.2 Scope . References . Definitions Abbreviations Description ATM VCC Identif

18、ier . ATM signalling VCC Identifier H.32 1 and H.3 1 O End Station Identifier . Internet related identifiers . MPOA VI“ identifier H.245 portNumber Operational requirements Primitives Coding requirements . Messages . Information element Procedures . General procedures . Procedure for the use of AAL

19、type 2 identifier . Appendix I Appendix II II . 1 Example of coding of the ATM Forum ATM VCC Identifier for Trunking 11.2 Example of coding of 4.2630.1 6 ATM VCC Identifier . 11.3 Example of coding of IPv4 session identifier . 11.4 Example of coding of ST2+ session identifier 11.5 Example of coding

20、of IPv6 session identifier . 11.6 11.7 11.8 Appendix III - Guidelines for the setting of the instruction indicators . Example of coding of MPLS VCID identifier Example of coding ofH.245 portNumber for H.323 Example of coding of ATM Forum MPOA VI“ identifier . ITU-T 4.2941.2 (12/1999) Page 1 1 2 2 2

21、2 3 3 3 3 3 3 3 3 3 3 5 5 5 6 7 7 7 8 8 9 9 10 10 10 . 111 COPYRIGHT International Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling ServicesCOPYRIGHT International Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling ServicesITU-T Recommendat

22、ion 4.2941.2 Digital subscriber signalling system No. 2 (DSS2) - Generic identifier transport extensions (Geneva, 1999) 1 Scope This part of Recommendation 4.2941 defines DSS2 signalling capability to carry H.321 and H.310 End Station Identifiers, H.245 portNumber, ATM VCC Identifiers, ATM signallin

23、g VCC identifiers, Internet related Identifiers and MPOA VPN Identifiers. These identifiers are coded in the Generic identifier transport information element defined for the Broadband Integrated Services Digital network (B-ISDN) Digital Subscriber Signalling System No. 2 (DSS2) protocol. This Recomm

24、endation is part of the DSS2 family of ITU-T Recommendations; it specifies extensions to Recommendations 4.2931 i and 4.2971 2 and does not repeat states, information elements, messages and procedures contained therein, but only specifies extensions related to the use of the Generic identifier infor

25、mation element. This Recommendation is applicable to equipment, supporting DSS2 signalling capabilities as defined, in particular, in Recommendations 4.293 1 11 and 4.2971 2 attached at either side of a TB reference point or coincident SB and TB reference point when used as an access to the public B

26、-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 of publication, the editions indicated were valid. All Recommendations and other references are subject to

27、revision; all users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent addition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. ITU-T Recommendation 4.293 1 (

28、1995), Digital Subscriber Signalling System No. 2 - User-Network Inte flace (v2vr) layer 3 specijkation for basic call/connection control. ITU-T Recommendation 4.2971 (1995), Digital Subscriber Signalling System No. 2 - User-Network In te flace layer 3 specijka tion for poin t- to-m ultipoin t call/

29、connection control. ITU-T Recommendation 4.2941.1 (1997), Digital Subscriber Signalling System No. 2 - Generic iden tiper transport. ITU-T Recommendation H.32 1 (1998), Adaptation of H.320 visual telephone terminals to B-ISDN environments. ITU-T Recommendation H.3 1 O (1 998), Broadband audiovisual

30、communication systems and term inals. ITU-T Recommendation Q. 2630.1 (1999), AAL type 2 signallingprotocol (capability set 1). ITU-T Recommendation H.323 (1 999), Packet-based multimedia communications systems. ITU-T Recommendation H.245 (2000), Control protocol for multimedia communication. The ATM

31、 Forum, af-vtoa-0113.000 (1999), ATM Trunking using AAL2 for Narrowband Services. ITU-T 4.2941.2 (12/1999) 1 COPYRIGHT International Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling Services 101 IETF RFC 3033 draft-ietf-mpls-git-uus-O4.t (2000), The assignment of the i

32、nformation Jield and protocol identiJer in the Q.2941 Generic identiJer and Q.2957 user- to-user signalling for the Internet protocol. The ATM Forum, af-mpoa-0 129.000 (1 999), MPOA vl. 1 Addendum on WN support. IEEE Std 802 (1990), Local and Metropolitan Area Networks: IEEE Standards: Overview and

33、Architecture, clause 5.1. 1 11 121 3 Definitions No new definitions are needed. 4 Abbreviations This Recommendation uses the following abbreviations: AAL ATM Adaptation layer IANA Internet Assigned Number Authority IETF Internet Engineering Task Force IPv4 Internet protocol version 4 IPv6 Internet p

34、rotocol version 6 ISUP ISDN user part MPLS Multiprotocol label switching MPOA Multiprotocol encapsulation over ATM ST2+ vcc Virtual channel connection VCID Virtual channel identifier VPN Virtual private network Internet Stream protocol version 2 5 Description The Generic identifier transport signall

35、ing capability allows the generation and transport by the B-ISDN of identifiers used by different distributed applications. The Generic identifier transport capability is a signalling capability for exchanging identifiers between an originating entity and a peer entity. The transport of the followin

36、g identifiers is defined in this Recommendation: - ATM VCC Identifier. - ATM signalling VCC identifier. - - Internet related identifiers. - MPOA VPN identifier. - H.245 portNumber. H.3 10 and H.321 End Station identifier. 5.1 ATM VCC Identifier The ATM VCC Identifier is used to uniquely identify a V

37、CC. 2 ITU-T 4.2941.2 (12/1999) COPYRIGHT International Telecommunications Union/ITU TelecommunicationsLicensed by Information Handling Services5.2 ATM signalling VCC Identifier This identifier is used in ATM Forum specifications on ATM trunking 9. 5.3 The End Station Identifier is used to provide an

38、 end station ATM address to either a terminal or an AAL type 1 and 5 conversion gateway. This identifier is used to facilitate interworking between AAL type 1 based terminals and AAL type 5 based terminals which are defined in Recommendations H.321 4 and H.310 5. See Annex CH.310 5 and clause 7H.321

39、 4 for the procedures. H.321 and H.310 End Station Identifier 5.4 Internet related identifiers The Internet related identifier is used to uniquely identify a VCC to be used for a specific Internet Session or Resource between two entities. 5.5 MPOA VPN identifier The MPOA VPN identifier is used to un

40、iquely identify MPOA VPN service providers and their customers. 5.6 H.245 portNumber H.245 portNumber is used to correlate one or two (in the forward and backward directions) RTP media stream(s) to an ATM VCC. The use of Generic application transport information element to transport the H.245 portNu

41、mber for H.323 over ATM is described in Annex CH.323 7. The H.245 portNumber is defined in 7.3H.245 SI. 6 Operational 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

42、 Coding requirements 8.1 Messages No additional specification is required in this Recommendation. Refer to Recommendation 4.2941.1 3. 8.2 Information element For the sake of clarity, the Generic identifier transport information element defined in Recommendation 4.2941.1 3 is reproduced in Appendix I

43、. The maximum length of the Generic identifier transport information element has been extended to 63 octets. The identifiers defined in this Recommendation require the following additional coding: ITU-T 4.2941.2 (12/1999) 3 COPYRIGHT International Telecommunications Union/ITU TelecommunicationsLicen

44、sed by Information Handling ServicesIdentiper related standard/application (octet 5) (Note 1) Bits 87654321 00000001 00000010 0000001 1 IPv4 (Note 2) 00000100 ST2+ (Note 2) 00000 101 IPv6 (Note 2) 00000110 MPLS (Note 2) 00000111 00001000 af-vtoa-0113.000 9 (Note 4) 00001001 00001011 All other values

45、 are reserved. NOTE 1 - This field identifies a user of the DSS2 using the identifier(s) coded in octet group 6 and possibly the subsequent octet groups. An identifier type may be used by different standardapplication and a standardapplication may require different identifier types to be carried in

46、the same instance of the Generic identifier transport information element. NOTE 2 - These code points identify an IPv4, ST2+, IPv6, MPLS or an experimentorganization-specific related identifier coded in octet group 6. For the exact definitions, use and coding, IETF relevant specifications shall be c

47、onsulted. In case of divergence, they take precedence over this Recommendation. Examples of coding are provided in Appendix II. NOTE 3 - This code point identifies ATM Forum MPOA specification 1 i. For the exact definition, use and coding of the corresponding identifier(s), ATM Forum specifications

48、shall be consulted. In case of divergence, they take precedence over this Recommendation. An example of coding is provided in Appendix II. NOTE 4 - This code point identifies ATM Forum ATM VCC trunking specification 9. For the exact definition, use and coding of the corresponding identifier(s), ATM

49、Forum specifications shall be consulted. In case of divergence, they take precedence over this Recommendation. An example of coding is provided in Appendix II. NOTE 5 - When the identifier related standardapplication field refers to Recommendation Q.2630.1 6, the identifier is used to uniquely identify an ATM VCC used by two AAL type 2 signalling peer entities defined in Recommendation Q.2630.1 6. An example is provided in Appendix II. NOTE 6 - When the identifier related standardapplication field refers to Recommendation H.323 7, a H.245