（number）和如果它是被驗證的以及通過ATM網絡或者它被網絡提供，那么使用主叫方數
字作為主叫方證明的一部分從而加強安全是可行的。

附錄.為ST2+信息域和協議標識符分配
   	這附錄在類屬標識符和User-to-user信令（身上）為ST2+指定信息域和協議標識符分配。
注意這附錄不是標準的一部分。

A.1 ST2+會話標識符
   	如果標識符相關的標準/應用（standard/application）在類屬標識符信息元中的域是ST2+，
和在標識符（身上）標識符類型域是會話（Session），（那么）標識符是ST2+會話標識符。
ST2+會話標識符的格式在Fig. A.1中被展示。

                              Bits                         Octet
           8     7     6     5     4     3     2     1     length
        +-----+-----+-----+-----+-----+-----+-----+-----+

        |                Identifier type                |
        |                = Session (0x01)               |  1
        +-----+-----+-----+-----+-----+-----+-----+-----+
        |               Identifier length               |
        |               = 6 octets (0x06)               |  1
        +-----+-----+-----+-----+-----+-----+-----+-----+
        |                Stream ID (SID)                |  6
        +-----+-----+-----+-----+-----+-----+-----+-----+

      	Fig. A.1：ST2+會話標識符。

   	標識符類型域是會話（Session）(0x01)。

   	標識符長度是6八位組（字節）。

   	流ID(SID)[11]被分配給標識符值域。

A.2 ST2+ SCMP
   	為ST2+ SCMP 的User-user信息元的格式在Fig. A.2中被展示。

                                 Bits
              8     7     6     5     4     3     2     1    Octets
           +-----+-----+-----+-----+-----+-----+-----+-----+
           |        Information element identifier         |
           |    = User-user information element (0x7E)     |  1
           +-----+-----+-----+-----+-----+-----+-----+-----+
           |  1  |   Coding  |    IE instruction field     |
           | Ext |  standard |Flag |Res. |  IE action ind. |  2
           +-----+-----+-----+-----+-----+-----+-----+-----+
           |   Length of contents of information element   |  3-4
           +-----+-----+-----+-----+-----+-----+-----+-----+
           |             Protocol discriminator            |
           |     = Internet protocol/application (0x06)    |  5
           +-----+-----+-----+-----+-----+-----+-----+-----+
           |    Internet protocol/application identifier   |
           |               = ST2+ SCMP (0x01)              |  6
           +-----+-----+-----+-----+-----+-----+-----+-----+
           |                   ST2+ SCMP                   |  7-
           =                                               =
           |                                               |
           +-----+-----+-----+-----+-----+-----+-----+-----+

   		Fig. A.2：ST2+ SCMP。

   	Internet協議/應用（protocol/application）標識符域是ST2+ SCMP(0x01)。

   	ST2+ SCMP[11] 被分配給Internet協議/應用（protocol/application）相關的信息域。SETUP
和ADD PARTY報文可以含有ST2+ SCMP CONNECT報文。CONNECT和ADD PARTY ACK
報文可以含有ST2+ SCMP ACCEPT報文。RELEASE和DROP PARTY報文可以含有ST2+ 
SCMP DISCONNECT報文。RELEASE，RELEASE COMPLETE， ADD PARTY REJECT， 
和 DROP PARTY報文可以含有ST2+ SCMP REFUSE報文。

參考資料
   [1]  ITU-T, "Broadband Integrated Services Digital Network (B-
        ISDN)-Digital Subscriber Signaling System No. 2 (DSS 2)-User-
        Network Interface (UNI) Layer 3 Specification for Basic
        Call/Connection Control," ITU-T Recommendation Q.2931, September
        1995.

   [2]  ITU-T, "Broadband Integrated Services Digital Network (B-ISDN)-
        Digital Subscriber Signaling System No. 2 (DSS 2)-User-Network
        Interface Layer 3 Specification for Point-to-Multipoint
        Call/Connection Control," ITU-T Recommendation Q.2971, October
        1995.

   [3]  ITU-T, "Broadband Integrated Services Digital Network (B-ISDN)
        Digital Subscriber Signaling System No. 2 (DSS 2): Generic
        Identifier Transport," ITU-T New Recommendation Q.2941.1,
        September 1997.

   [4]  ITU-T, "Broadband Integrated Services Digital Network (B-ISDN)
        Digital Subscriber Signaling System No. 2 (DSS 2): Generic
        Identifier Transport Extensions," ITU-T New Recommendation
        Q.2941.2, December 1999.

   [5]  ITU-T, "Stage 3 Description for Additional Information Transfer
        Supplementary Service Using B-ISDN Digital Subscriber Signaling
        System No. 2 (DSS 2)-Basic Call Clause 1-User-to-User Signalling
        (UUS)," ITU-T Recommendation Q.2957, February 1995.

   [6]  ITU-T, "Stage 3 Description for Additional Information Transfer
        Supplementary Service Using B-ISDN Digital Subscriber Signaling
        System No. 2 (DSS 2)-Basic Call Clause 1-User-to-User Signalling
        (UUS)," ITU-T Recommendation Q.2957 Amendment 1, December 1999.

   [7]  Postel, J., Ed., "Internet Protocol", STD 5, RFC 791, September
        1981.

   [8]  Deering, S. and R. Hinden, "Internet Protocol, Version 6 (IPv6)
        Specification", RFC 2460, December 1998.

   [9]  Postel, J., "User Datagram Protocol", STD 6, RFC 768, August
        1980.

   [10] Postel, J., Ed., "Transmission Control Protocol", STD 7, RFC
        793, September 1981.

   [11] Delgrossi, L. and L. Berger, Ed., "Internet Stream Protocol
        Version 2 (ST2) Protocol Specification - Version ST2+", RFC
        1819, August 1995.

   [12] Braden, R., Ed., "Resource ReSerVation Protocol (RSVP) - Version
        1 Functional Specification", RFC 2205, September 1997.

   [13] Nagami, K., Demizu, N., Esaki, H., Katsube, Y. and P. Doolan,
        "VCID Notification over ATM link for LDP", RFC 3038, January
        2001.

   [14] Narten, T., and H. Alvestrand, "Guidelines for Writing an IANA
        Considerations Section in RFCs", BCP 26, RFC 2434, October 1998.

   [15] P. Newman, T. Lyon, and G. Minshall, "Flow Labelled IP: A
        Connectionless Approach to ATM," Proc. IEEE Infocom, March 1996.

   [16] S. Damaskos and A. Gavras, "Connection Oriented Protocols over
        ATM: A case study," Proc. SPIE, Vol. 2188, pp.226-278, February
        1994.

   [17] ITU-T, "Integrated Services Digital Network (ISDN) Overall
        Network Aspects and Functions ISDN Protocol Reference Model,"
        ITU-T Recommendation I.320, November 1993.

   [18] ITU-T, "Digital Subscriber Signaling System No. 1 (DSS 1)
        Specification of a Synchronization and Coordination Function for
        the Provision of the OSI Connection-mode Network Service in an
        ISDN Environment," ITU-T Recommendation Q.923, February 1995.


確認
   	我非常感謝NTT信息共享實驗室工作組（the NTT Information Sharing Lab. Group）
的Kenichi Kitami，他也是ITU- TSG11 WP1的主席。NTT信息共享實驗室的Shinichi 
Kuribayashi，以及NTT網絡服務系統實驗室（the NTT Network Service Systems Labs.）
的Hiroshi Yao和Takumi Ohba，NTT信息共享平臺實驗室（the NTT Information Sharing 
Platform Labs.），對他們寶貴的評論和討論（感謝）。

   	同時我也非常感謝IETF， ITU-T和ATM論壇的活躍成員，特別是Newbridge Networks
的Joel Halpern、Ascend Communications的Andrew Malis、Cisco Systems的George Swallow
和Bruce Davie、IBM的Rao Cherukuri、AT&T 的Rajiv Kapoor、Lucent的Greg Ratta、NEC
的Kaoru Kenyoshi、 Hitachi 的HirotoUno、Toshiba的Hiroshi Esaki和Kenichi Nagami以及
NAIST的Noritoshi Demizu，對他們寶貴的評論和討論（感謝）。

   	還有，在NTT多種媒體聯合計劃NACSIS（the NTT Multimedia Joint Project with  
NACSIS）方面關于ATM計劃之上的ST2+期間，這份規格說明書（就是在這期間）建立在
各種各樣討論的基礎上。我非常感謝科學信息系統國家中心的教授Shoichiro Asano，為他的
在這個區域中非常寶貴的忠告。

作者的地址
   Muneyoshi Suzuki
   NTT Information Sharing Platform Laboratories
   3-9-11, Midori-cho
   Musashino-shi, Tokyo 180-8585, Japan

   Phone: +81-422-59-2119
   Fax:   +81-422-37-7691
   EMail: suzuki.muneyoshi@lab.ntt.co.jp

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確認

   為RFC編輯功能資助現在由因特網協會（Internet Society）提供。

譯者注：對于本文檔的完整版權聲明原文如下：

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   This document and the information contained herein is provided on an
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   TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
   BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
   HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
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RFC3033——The Assignment of the Information Field and Protocol Identifier in the Q.2941 
Generic Identifier and Q.2957 User-to-user Signaling for the Internet Protocol）
用于Internet協議的信息域和協議標識符在Q.2941類屬標識符和Q.2957 User-to-user信令中的分配


2
RFC文檔中文翻譯計劃