rfc2824.txt

RFC文档

@错误报告

    如果一个未曾预料的错误发生了,脚本就一定要能够向脚本所有者报告错误.这和脚本服务器用来向用户报告错误的机制是相同的.(详情请看12.5)

@对用户本地信息的使用

    代理服务器通常会收集用户本地的信息,通过SIP注册信息,H.323的全部信息,或者其他有些机制(详情请看6.2).CPL是与这个信息相关的,因此呼叫可以向前续传到注册的地址,或者是它的子集.

@数据库访问

    关于CPL控制的信息,被安排在额外的数据库中.例如,更广的地址数据库,或者认可信息,在管理员控制下.语言列出了一些数据库的访问协议(如果SQL,LDAP),或者其他类别.

@其他的信息

    脚本可以访问的其他信息,包括网页,尤其是在SIP信息中被发送回来的;或者一个清洁的接口可以施行函数调用,比如Corba, RMI,或者DCOM,例如可以访问额外的帐单数据库.但是,为了简单,这些接口不一定在原始的版本协议中.

12.4语言特征

    有一些特征,与CPL运行环境的操作一点关系都没有,但对于一些标准服务的执行,却是必要的.(下面的,并不完全):

@模式匹配

     它应该可以为地址和文章的字符串提供特殊处理.这些字符串不只是完整的字符,还有部分匹配的字符.

@地址过滤

    一旦用12.3中提到的方法,得到了一个地址集合,用户就应该从它们之中选择一些出来做为它们的子集.这就要以它们的地址与参数为基础.

@随机选择

    呼叫分类的一些形式是随机的,就象它们结束的地方一样.

@数据/时间信息

    用户可能希望以一些服务为条件(举例来说,呼叫续传,和呼叫分类),比如时间,日期等等.  

12.5控制

    就象第八部分中讨论的,我们必须有一个体制,来发送和接收CPL脚本,以及相关的数据,向或者从一个信号服务器.这个方法一定要能够支持将上载时间的错误报告给用户;当然,我们同样需要一些体制,当脚本执行时把错误报告给用户.鉴定是最重要的,加密术是相当有效的.关于这种体制的详情,可能是(应该就是),呼叫处理语言本身的一个详细说明.

13安全考虑

    关于CPL脚本的安全考虑就象[8]与[12.5]中讨论的那样.关于语言执行的考虑在[12.1]中进行了详细的讨论.

14感谢

    我们很高兴的感谢Tom La Porta和Jonathan Rosenberg对我们的支持,以及对文档的注释.

15作者地址

Jonathan Lennox
   Dept. of Computer Science
   Columbia University
   1214 Amsterdam Avenue, MC 0401
   New York, NY 10027
   USA

   EMail: [e-mail]

   Henning Schulzrinne
   Dept. of Computer Science
   Columbia University
   1214 Amsterdam Avenue, MC 0401
   New York, NY 10027
   USA

   
   EMail: [e-mail]

16参考书目


   [1]  Handley, M., Schulzrinne, H., Schooler, E. and J. Rosenberg,
        "SIP: Session Initiation Protocol", RFC 2543, March 1999.

   [2]  International Telecommunication Union, "Packet based multimedia
        communication systems," Recommendation H.323, Telecommunication
        Standardization Sector of ITU, Geneva, Switzerland, Feb. 1998.

   [3]  K. Coar and D. Robinson, "The WWW common gateway interface
        version 1.1", Work in Progress.

   [4]  T. Showalter, "Sieve: A mail filtering language", Work in
        Progress.

   [5]  J. Lennox and H. Schulzrinne, "CPL: a language for user control
        of internet telephony services", Work in Progress.

   [6]  International Telecommunication Union, "General recommendations
        on telephone switching and signaling -- intelligent network:
        Introduction to intelligent network capability set 1,"
        Recommendation Q.1211, Telecommunication Standardization Sector
        of ITU, Geneva, Switzerland, Mar. 1993.

   [7]  Guttman, E., Perkins, C., Veizades, J. and M. Day, "Service
        Location Protocol, Version 2", RFC 2608, June 1999.

   [8]  E. J. Cameron, N. D. Griffeth, Y.-J. Lin, M. E. Nilson, W. K.
        Schure, and H. Velthuijsen, "A feature interaction benchmark for
        IN and beyond," Feature Interactions in Telecommunications
        Systems, IOS Press, pp. 1-23, 1994.

   [9]  J. Lennox, J. Rosenberg, and H. Schulzrinne, "Common gateway
        interface for SIP", Work in Progress.

   [10] J. Rosenberg, J. Lennox, and H. Schulzrinne, "Programming
        internet telephony services," Technical Report CUCS-010-99,
        Columbia University, New York, New York, Mar. 1999.

   [11] H. Schulzrinne and J. Rosenberg, "SIP caller preferences and
        callee capabilities", Work in Progress.

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18承认


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