RFC 3263 SIP: SIP 定位服务器

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............................          ..............................
    .                          .          .                            .
    .                +-------+ .          . +-------+                  .
    .                |       | .          . |       |                  .
    .                | Proxy |------------- | Proxy |                  .
    .                |   1   | .          . |  2    |                  .
    .                |       | .          . |       |                  .
    .              / +-------+ .          . +-------+ /                .
    .             /            .          .            /               .
    .            /             .          .             /              .
    .           /              .          .              /             .
    .          /               .          .               /            .
    .         /                .          .                /           .
    .        /                 .          .                 /          .
    .       /                  .          .                  /         .
    .   +-------+              .          .                +-------+   .
    .   |       |              .          .                |       |   .
    .   |       |              .          .                |       |   .
    .   | UA 1  |              .          .                | UA 2  |   .
    .   |       |              .          .                |       |   .
    .   +-------+              .          .                +-------+   .
    .              Domain A    .          .   Domain B                 .
    ............................          ..............................

                        Figure 1: The SIP trapezoid

Table of Contents

   1          Introduction ........................................    2
   2          Problems DNS is Needed to Solve .....................    2
   3          Terminology .........................................    5
   4          Client Usage ........................................    5
   4.1        Selecting a Transport Protocol ......................    6
   4.2        Determining Port and IP Address .....................    8
   4.3        Details of RFC 2782 Process .........................    9
   4.4        Consideration for Stateless Proxies .................   10
   5          Server Usage ........................................   11
   6          Constructing SIP URIs ...............................   12
   7          Security Considerations .............................   12
   8          The Transport Determination Application .............   13
   9          IANA Considerations .................................   14
   10         Acknowledgements ....................................   14
   11         Normative References ................................   15
   12         Informative References ..............................   15


Rosenberg & Schulzrinne     Standards Track                     [Page 1]

RFC 3263               SIP: Locating SIP Servers               June 2002


   13         Authors' Addresses ..................................   16
   14         Full Copyright Statement ............................   17