rfc2458.txt

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Lu, et. al.                  Informational                     [Page 11]

RFC 2458                Pre-PINT Implementations           November 1998


   The following diagram (Figure 6) shows the interface architecture
   involved in providing the kind of service mentioned above.


                            Internet  __                     __
                            Server   [__]        _______    [__]
                               [W3S-]-. ___/    .-.-.-[W3C-] Internet
                     _________________|/.-.-.-.-.   \         Terminal
                    /               .. .             \
                    | Internet     / .  \             |
                    \___________  .  .   .           /
                                \/___|____\_________/
                                .    .      .
                               /      |       \
                            (A)      (B)      (E)
                           .          .          .
                         _|_         _|_         _|_
                        [SN ]<-(D)--[SMS]--(H)->[SCP]
                        [|-|]        ---        [-!-]
                        /  \                      !
                      (C)  (I)   ...........(F)...!.(G).
                     /        \  !                     !
                  [--|]       [|-!]                  [-!-]
                  [CO ]       [MSC]                  [SSP]
                  [---]       [---] \|/              [---]
             /--\   |           |____|                 |   /--\
            ()/\()  |                                  |  ()/\()
             /--\___|                1                 |___/--\
    Fixed PSTN Terminal             []            Fixed PSTN Terminal
                             Mobile Terminal

   Key: W3S   HTTP (Web) Server
        W3C   HTTP (Web) Client/Browser
        CO    Central Office (Telephone Exchange)
        MSC   Mobile Switching Center (Mobile Network Telephone
              Exchange)
        SN    Service Node
        SSP   Service Switching Point
        SCP   Service Control Point
        SMS   Service Management System
        .-.-. Internet relationship
        ___   PSTN Access relationship
        ...   PSTN "core" signaling relationship

                                 Figure 6






Lu, et. al.                  Informational                     [Page 12]

RFC 2458                Pre-PINT Implementations           November 1998


   The interfaces are:

   A    The interface over which Internet requests for service are
        delivered to the Service Node
   B    The interface over which Service Management requests are sent
        from the Internet to the Service Management System
   C    The interface over which the Service Node sends call control
        requests to a connected Central Office
   D    The interface over which the Service Management System manages
        the Service Node
   E    The interface over which Internet requests for service are
        delivered to the Service Control Point
   F    The interface over which the Service Control Point sends service
        call control requests to the Mobile Switching Center
   G    The interface over which the Service Control Point sends service
        control requests to the Service Switching Point
   H    The interface over which the Service Management System manages
        the Service Control Point
   I    The interface over which the Service Node sends service call
        control requests to the Mobile Switching Center

   In practice, a number of the interfaces have very similar purposes to
   one another. The means by which these purposes are achieved differ,
   in that some of the interfaces (C and I) reflect access arrangements,
   whilst others (F and G) imply a "core" signaling relationship.
   However, it is possible to categorize them in terms of the "intent"
   of messages sent across the interfaces.

   For example, Interfaces A and E are similar; one of the main aims of
   PINT work is to ensure that they are the same. Similarly, Interfaces
   D and H imply similar actions and are likely to carry similar
   messages. Interfaces C, F, G, and I are all used to request that a
   call be initiated, albeit via access or core signaling relationships.

   The interfaces can also be viewed in terms of the kind of components
   that are involved and the bodies by which they are codified.
   Interfaces A, B, and E are all going to be realized as Internet
   Protocols.  All of the others use existing protocols in the PSTN/IN.
   Traditionally, these have been codified by different groups, and this
   is likely to be the case in the PINT work.

   The general arrangements for the different systems are shown below
   (Figures 7, 8, 9, and 10). They differ in the details of their
   configurations, but the main tasks they perform are very similar, and
   so the overall operation is similar to the generic architecture shown
   in Figures 5 and 6.





Lu, et. al.                  Informational                     [Page 13]

RFC 2458                Pre-PINT Implementations           November 1998


   Key for following diagrams:

       Components:

   W3C     World Wide Web Client
   W3S     World Wide Web Server
   WSA     Web Server "Back End Program" Interface (CGI or Servlet
           interface)
   Srvlt   Servlet "back end" program/objects
   FS      Finger Server
   SCTPC   Simple Computer Telephony Protocol Client
   SCTPS   Simple Computer Telephony Protocol Server
   CBC     CallBroker Client
   CBS     CallBroker Server
   SSTPC   Service Support Transport Protocol Client
   SSF     Service Switching Function
   SCF     Service Control Function
   SRF     Special Resource Function
   CO      Central Office/ Public Telephone Exchange
   SSP     Service Switching Point
   SCP     Service Control Point
   SR/I.IP Special Resource/ "Internet" Intelligent Peripheral
   SMS     Service Management System
   INAPAd  Intelligent Network Application Part Adaptor
   PktFlt  Packet Filter (Firewall)
   SNMPAg  Simple Network Management Protocol Agent

       Protocols:

   P0    HyperText Transfer Protocol
   P1    HTTP Server <-> "Back End Program" internal protocol
   P2    CallBroker Client <-> CallBroker Server protocol (AT&T system),
      or SCTP Client <-> Server protocol (Nortel system)
   P3    PINT User Agent <-> PINT Gateway protocol
   P4    Intra-Intelligent Network protocol (e.g., INAP)
   P5    Proprietary (INAP-based) Gateway-> I.IP protocol
   P6    Finger protocol
   P7    Digital Subscriber Signaling 1 protocol
   P8    Simple Network Management Protocol
   P9    SMS <-> Service Control Point/Service Node protocol











Lu, et. al.                  Informational                     [Page 14]

RFC 2458                Pre-PINT Implementations           November 1998


    _____             _______             _____
   |[W3C]|----(p0)-->| [W3S] |<--(p0)----|[W3C]|
   |[---]|           | [WSA] |           |[FS.]|
   |-----|           |   !   |           |[-!-]|
                     |  (p1) |           |--\--|
                     |   !   |               ^
                     |   !   |               (p6)
                     |   !   |                 \
                     |  (p1) |                  \
                     |   !   |                   \
                     |[Srvlt]|                    \
                     |___!___|                     \
                         !                          \
                        (p3)                         \
 Internet                !                            !
 .+.+.+.+.+.+.+.+.+.+.+. v .+.+.+.+.+.+.+.+.+.+.+.+.+.!.+.+.+.+.+.
 PSTN/IN  _______________!_________________       ____!_____ __________
          |I         [PktFlt]            I|       |[PktFlt]| |[PktFlt]|
          |N          Gateway            N|       |   !    | |   !    |
          |A ___________________________ A|       |   !    | |   !    |
          |P |                         | P|       |   !    | |[SNMPAg]|
  -(p4)-- |A | <-(p4)-> [SCP] <-(p4)-> | A|-(p5)->|[SR/IIP]| | [SMS]  |
  \       |d |          [-^-]          | d|       |[------]| | [-^-]  |
   \      |__|            !            |__|       |________| |___!____|
    \                     !                                      !
   [-v-]                  !-----------------(p9)-----------------!
   [SSP]
   [---]
 ___| |______
 |           |
 |  /--\     |    /--\
 | ()/\()    |   ()/\()
 |__/__\     |____/__\


                 Figure 7: The Siemens Web Call Center















Lu, et. al.                  Informational                     [Page 15]

RFC 2458                Pre-PINT Implementations           November 1998


    _____             _______
   |[W3C]|----(p0)-->| [W3S] |
   |[---]|           | [WSA] |
   |-----|           |   !   |
                     |  (p1) |
                     |   !   |
                     |   !   |
                     |   !   |
                     |  (p1) |
                     |   !   |
                     |[SSTPC]|-<----------------------------------
                     |___!___|                                   !
                         !                                      (p8)
                        (p3)                                     !
 Internet                !                                       v
 .+.+.+.+.+.+.+.+.+.+.+. v .+.+.+.+.+.+.+.+.+.+.+.+.+.+.+.+.+.+. ! .+.+
 PSTN/IN  _______________!__________________________________ ____!_____
          |          [PktFlt]        Service       [PktFlt]| |[PktFlt]|
          |              !             Node                | |   !    |
          |        [SCF Adaptor]                           | |   !    |
          |               !                                | |[SNMPAg]|
          |[SSF]<-(p4)->[SCF] <-------(p4)--------> [SRF]  | | [SMS]  |
          |[|--]        [-^-]                       [---]  | | [-^-]  |
          |_|_____________!________________________________| |___!____|
            |             !                                      !
   [-v-]  (p7)            !-----------------(p9)-----------------!
   [CO.]____|
   [---]
 ___| |_______
 |           |
 |  /--\     |    /--\
 | ()/\()    |   ()/\()
 |__/__\     |____/__\

                      Figure 8: The Lucent System
















Lu, et. al.                  Informational                     [Page 16]

RFC 2458                Pre-PINT Implementations           November 1998


    _____             ________
   |[W3C]|----(p0)-->| [W3S]  |
   |[---]|           | [WSA]  |
   |-----|           |   !    |
                     |  (p1)  |
                     |   !    |
                     |[WS/CBS]|
                     |[Adaptr]|
                     |___!____|
                         ^
                        (p2)
    _____             ___v____
   |[CBC]|           | [CBS]  |
   |[---]|<---(p2)-->| [---]  |-<---------------------------------
   |-----|           |___!____|                                  !
                         !                                      (p8)