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draft-bidulock-sigtran-sginfo-03

Description: Request For Comments

You can download source copies of the file as follows:

draft-bidulock-sigtran-sginfo-03.txt in text format.
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Listed below is the contents of file draft-bidulock-sigtran-sginfo-03.txt.




Network Working Group                                     Brian Bidulock
INTERNET-DRAFT                                       OpenSS7 Corporation

                                                           July 27, 2003
Expires in January 2004

          Signalling Gateway (SG) Information (SGINFO) Support
                                  for
                   Signalling User Adaptation Layers

                 <draft-bidulock-sigtran-sginfo-03.txt>

Status of this Memo

     This document is an Internet-Draft and is in full conformance with
  all provisions of Section 10 or RFC 2026.  Internet-Drafts are working
  documents of the Internet Engineering Task Force (IETF), its areas,
  and its working groups.  Note that other groups may also distribute
  working documents as Internet-Drafts.

     Internet-Drafts are draft documents valid for a maximum of six
  months and may be updated, replaced, or obsoleted by other documents
  at any time.  It is inappropriate to use Internet-Drafts as reference
  material or to cite them other than as 'work in progress'.

     The list of current Internet-Drafts can be accessed at
  http://www.ietf.org/ietf/1id-abstracts.txt

     The list of Internet-Draft Shadow Directories can be accessed at
  http://www.ietf.org/shadow.html

     To learn the current status of any Internet-Draft, please check the
  Directories on ftp.is.co.za (Africa), nic.nordu.net (Europe),
  munnari.oz.au (Pacific Rim), ftp.ietf.org (US East Coast), or
  ftp.isi.edu (US West Coast).

Copyright

     Copyright (C) The Internet Society (2003).  All Rights Reserved.

Abstract

     This Internet-Draft describes Signalling Gateway (SG) Information
  (SGINFO) for Signalling User Adaptation Protocols [M2UA..TUA], which
  permits supporting Signalling Gateways (SG) to convey additional
  Application Server (AS) support information to Application Server
  Processes (ASPs) activating for AS on the SG.  This additional AS
  support information consists of information pertaining to the
  underlying SS7 Signalling Provider that otherwise would have to be
  statically configured at the Application Server Process (ASP) or

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  exchanged between SG and ASP using a non-IETF defined protocol.

Contents

     A complete table of contents, list of tables and illustrations, and
  change history appears at the end of this document.

1.  Introduction

1.1.  Scope

     This Internet-Draft provides parameters and procedures in extension
  to the parameters and procedures of the Signalling User Adaptation
  Layers (UAs) [M2UA..TUA], for the purpose of supporting the transfer
  of SG-specific information of interest to an Application Server during
  the ASP Active procedure.

     UA implementations with SGINFO are intended to be compatible with
  UA implementations not supporting this configuration.

1.2.  Abbreviations

      AS      --Application Server.
      ASP     --Application Server Process.
      IANA    --Internet Assigned Numbers Authority
      I-D     --Internet-Draft
      IETF    --Internet Engineering Task Force
      IP      --Internet Protocol.
      IPSP    --IP Signalling Point.
      SCCP    --Signalling Connection Control Part.
      SCTP    --Stream Control Transmission Protocol.
      SG      --Signalling Gateway.
      SGP     --Signalling Gateway Process.
      SIGTRAN --IETF Signalling Transport WG
      SPP     --Signalling Peer Process.
      SS7     --Signalling System No. 7.
      SUA     --SS7 SCCP-User Adpatation Layer.
      TCAP    --Transaction Capabilities Application Part.
      TUA     --SS7 TCAP-User Adaptation Layer.
      UA      --User Adaptation Layer.
      WG      --Working Group

1.3.  Terminology

     SGINFO adds the following terms to the terminology presented in the
  UA documents:[1]

  Signalling User Adaptation Layer (UA) - one or more of the Stream
      Control Transmission Protocol (SCTP) [RFC 2960] SS7 Signalling
      User Adaptation Layers [M2UA..TUA] supporting ASP Management.

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1.4.  Overview

     There is a need to provide extensions for the Signalling User
  Adaptation Layer protocols to permit a Signalling Gateway (SG) to
  provide Application Server (AS) specific information pertaining to the
  SG's ability to support the Application Server.

     For example, the "Maximum SIF Length" of MTP3 [Q.704] is a value
  that an MTP-User at an AS needs to reference to avoid sending MSU data
  in excess of these MTP-PDU length restrictions.  The "Maximum SIF
  Length"; however, can change due to SS7 Network failures or
  reconfiguration at the SG that cannot be handled purely by static
  configuration information at an ASP.

     Additional examples exist for SCCP [Q.711] and TCAP [Q.771] and the
  need for these protocol limits at the Application Server is evidenced
  by the requirements for these values in the OSI/ISO NSD [X.213]
  Compliant NPI [NPI], and the OSI/ISO TSD [X.214] and the OSI/ISO ROSE
  [X.219] Compliant TPI [TPI], and the ACSE [ISO 8649, ISO 8650]
  compliant mOSI extensions to the XNS [XNS].

     SGINFO provides parameters and procedures that allow Signalling
  Gateway Processes (SGPs) to inform Application Server Processes (ASPs)
  of the SG parameters, as well as provides procedures to update these
  parameters in an active AS.

1.4.1.  Existing Information Management

     While there is a mandate to provide MIBs to support UA
  configuration, the existing UA procedures[2] and MIBs make no
  provisions for the management of dynamic operational information at a
  Signalling Gateway that is of specific concern to a UA-User at an
  Application Server (AS).

     For example, if an Signalling Gateway changes an operation
  parameter of necessary to a UA-User at an Application Server (AS),
  such as the "Maximum SIF Length", there is no mechanism for the SG to
  communicate this information to the concerned Application Server (AS).

     While the existing UA procedures[2] provide for the SG giving an
  indication of a "Protocol Error" or "Invalid Parameter Value" as a
  result of an operational parameter being exceeded, there are no
  procedures for the Application Server to discover the operational
  parameters when they are dynamic.

     The lack of an IETF procedure for managing operational parameter
  information represents a deficiency of the existing UA procedures[2]
  that detracts from interoperability between separate implementations
  of SGP and ASP.

1.4.2.  SGINFO Information Management

     To remedy these deficiencies, SGINFO provides support for the
  following:

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   + Support for an SG indicating operational parameters to an
     Application Server (AS).
   + Support for an SG changing operational parameter for an active
     Application Server (AS).
   + Support for interworking between SGPs supporting SGINFO and ASPs
     not supporting SGINFO.

Notes for Section 1

  [1]  See, for example, Section 1.2 of the specific UA document
       [M2UA..TUA].

  [2]  See, for example, Section 4 of the specific UA document
       [M2UA..TUA].

2.  Conventions

     The keywords MUST, MUST NOT, REQUIRED, SHALL, SHALL NOT, SHOULD,
  SHOULD NOT, RECOMMENDED, NOT RECOMMENDED, MAY, and OPTIONAL, when they
  appear in this document, are to be interpreted as described in [RFC
  2119].

3.  Protocol Elements

     SGINFO provides the following parameters and the messages in which
  they are included in addition to the parameters of the UAs.[1]

3.1.  Parameters

     SGINFO provides the following parameters in addition to the
  parameters defined for the UAs.[1]

3.1.1.  Protocol Limits

     The Protocol Limits parameter is a common parameter used in the
  ASPAC ACK message to indicate the protocol data unit size limitations
  presented by a Signalling Gateway to an Application Server.

     The Protocol Limits parameter is formatted as follows:[2]

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     0                   1                   2                   3
     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |         Tag = 0x001b          |            Length             |
    +- - - - - - - - - - - - - - - -+- - - - - - - - - - - - - - - -+
    |                        Maximum SDU Size                       |
    +- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -+
    |                   Optimal SDU Size (optional)                 |
    +- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -+
    |              Maximum Connect Data Size (optional)             |
    +- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -+
    |             Maximum Disconnect Data Size (optional)           |
    +- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -+
    |                  Maximum ESDU Size (optional)                 |
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

     The Protocol Limits parameter contains the following fields:

  Maximum SDU Size field: 32-bits (signed integer)

    The Maximum SDU Size field contains the maximum number of bytes in
    the Protocol Data parameter that the Signalling Gateway can support
    to the specific Application Server.

    M2UA For M2UA [M2UA] the Maximum SDU Size field provides the maximum
         size of the data payload of the Protocol Data field.  The
         maximum size is the largest maximum data payload size that can
         be transferred across the SS7 network by the SG for the
         specified link.  For example, for an SG supporting an SIF
         Maximum Size [Q.704] of 3094 bytes on the link, this size would
         be 3094.  For an SG supporting 272 bytes, this size would be
         272.

    M3UA For M3UA [M3UA] the Maximum SDU Size field provides the limit
         on the maximum size of the data payload of the Protocol Data
         field.  The maximum size is the largest maximum data payload
         size that can be transferred across the SS7 network by the SG
         for the specific Application Server.  For example, for an SG
         supporting both an SIF Maximum Size [Q.704] of 3094 bytes on a
         primary links and 272 bytes on secondary links, this size would
         be 3094.

    SUA  For SUA [SUA] the Maximum SDU Size field provides the limit on
         the maximum size of the User Data field for a normal (non-
         expedited) data transfer.  The maximum size is the largest data
         payload size that can be transferred across the SS7 network for
         the specific Application Server (and associated Protocol Class)
         considering segmentation.  If there is no limit on the NSDU
         size for an SCCP provider at an SG, this field will be set to a
         value of -1 (0xFFFFFFFF).

    TUA  For TUA [TUA] the Maximum SDU Size field provide the limit on
         the maximum size of the Components field for a TC-CONTINUE data

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         transfer.  The maximum size is the largest component size that
         can be transferred across the SS7 network for the specific
         Application Server (and associated Operation Class) considering
         segmentation.  If there is no limit on the component size for a
         TCAP provider at the SG, this field will be set to a value of
         -1 (0xFFFFFFFF).

  Optimal SDU Size field: 32-bits (signed integer)

    The Optimal SDU Size field contains the optimal number of bytes in
    the Protocol Data parameter that the Signalling Gateway can support
    to the specific Application Server.

    M2UA For M2UA [M2UA] the Optimal SDU Size field does not apply and
         is not included in the Protocol Limits parameter.

    M3UA For M3UA [M3UA] the Optimal SDU Size field provides the limit
         on the optimal size of the data payload of the Protocol Data
         field.  The optimal size is the smallest maximum data payload
         size that can be transferred across the SS7 network by the SG
         for the specific Application Server.  For example, for an SG
         supporting both an SIF Maximum Size [Q.704] of 3094 bytes on a
         primary links and 272 bytes on secondary links, this size would
         be 272.

    SUA  For SUA [SUA] the Optimal SDU Size field provides the limit on
         the optimal size of the User Data field for a normal (non-
         expedited) data transfer.  The optimal size is the largest data
         protocol size that can be transferred across the SS7 network
         for the specific Application Server (and associated Protocol
         Class) without segmentation.

    TUA  For TUA [TUA] the Optimal SDU Size field provides the limit on
         the optimal size of the Components field for a TC-CONTINUE data
         transfer.  The optimal size is the largest component size that
         can be transferred across the SS7 network for the specific
         Application Server (and associated Operation Class) without
         segmentation.

  Maximum Connect Data Size field: 32-bits (signed integer)

    The Maximum Connect Data Size field contains the maximum number of
    bytes in the Data parameter that the Signalling Gateway can support
    to the specific Application Server upon connection or transaction
    dialogue establishment.

    M2UA For M2UA [M2UA] the Maximum Connect Data Size field does not
         apply and is not included in the Protocol Limits parameter.

    M3UA For M3UA [M3UA] the Maximum Connect Data Size field does not
         apply and is not included in the Protocol Limits parameter.

    SUA  For SUA [SUA] the Maximum Connect Data Size field provides a
         limit on the maximum size of the User Data field that can be

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         included in CORE and COAK messages.  For Connection-less
         operation, this field does not apply and is not included in the
         Protocol Limits parameter.

    TUA  For TUA [TUA] the Maximum Connect Data Size field provides the
         limit on the maximum size of the User Information and
         Components that can be included in a TQRY or initial TCNV
         message.  For Operation Class 4, this field does not apply and
         is not included in the Protocol Limits parameter.

  Maximum Disconnect Data Size field: 32-bits (signed integer)

    The Maximum Disconnect Data Size field contains the maximum number
    of bytes in the Data parameter that the Signalling Gateway can
    support to the specific Application Server upon disconnection or
    transaction dialogue abort.

    M2UA For M2UA [M2UA] the Maximum Disconnect Data Size field does not
         apply and is not included in the Protocol Limits parameter.

    M3UA For M3UA [M3UA] the Maximum Disconnect Data Size field does not
         apply and is not included in the Protocol Limits parameter.

    SUA  For SUA [SUA] the Maximum Disconnect Data Size field provides a
         limit on the maximum size of the User Data field that can be
         included in a RELRE message.  For Connection-less operation,
         this field does not apply and is not included in the Protocol
         Limits parameter.

    TUA  For TUA [TUA] the Maximum Disconnect Data Size field provides
         the limit on the maximum size of the User Abort Information
         that can be included in a TUAB message.  For Operation Class 4,
         this field does not apply and is not included in the Protocol
         Limits parameter.

  Maximum ESDU Size field: 32-bits (signed integer)

    The Maximum ESDU Size field contains the maximum number of bytes in
    the Data parameter that the Signalling Gateway can support to the
    specific Application Server when data is expedited on a connection.

    M2UA For M2UA [M2UA] The Maximum ESDU Size field does not apply and
         is not included in the Protocol Limits parameter.

    M3UA For M3UA [M3UA] the Maximum ESDU Size field does not apply and
         is not included in the Protocol Limits parameter.

    SUA  For SUA [SUA] the Maximum ESDU Size field provides a maximum
         number of bytes in the User Data field for an expedited data
         transfer.  The maximum size is the largest expedited data
         payload size that can be transferred across the SS7 network for
         the specific Application Server.  For Connection-less or
         Protocol Class 2 operation, this field does not apply and is
         not included in the Protocol Limits parameter.

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    TUA  For TUA [TUA] the Maximum ESDU Size field does not apply and is
         not included in the Protocol Limits parameter.

3.2.  Messages

     SGINFO extends the following messages defined for the UAs.[1]

3.2.1.  ASP Active Acknowledgment (ASPAC ACK)

     SGINFO supplements the ASPAC ACK message by permitting the
  following optional parameters to be included in the message:

      Extension Parameters
      -----------------------------------------
      Protocol Limits             Optional

     The format of the resulting ASP ACK message for M2UA is as
  follows:[3]

     0                   1                   2                   3
     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |         Tag = 0x000b          |            Length = 8         |
    +- - - - - - - - - - - - - - - -+- - - - - - - - - - - - - - - -+
    |                       Traffic Mode Type                       |
    +-------------------------------+-------------------------------+
    |         Tag = 0x0001          |            Length             |
    +- - - - - - - - - - - - - - - -+- - - - - - - - - - - - - - - -+
    \                                                               \
    /                    Interface Identifiers                      /
    \                                                               \
    +-------------------------------+-------------------------------+
    |         Tag = 0x0008          |            Length             |
    +- - - - - - - - - - - - - - - -+- - - - - - - - - - - - - - - -+
    |                  Interface Identifier Start1                  |
    +- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -+
    |                   Interface Identifier Stop1                  |
    +- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -+
    |                  Interface Identifier Start2                  |
    +- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -+
    |                   Interface Identifier Stop2                  |
    +- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -+
    \                               .                               \
    /                               .                               /
    \                               .                               \
    +- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -+
    |                  Interface Identifier StartN                  |
    +- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -+
    |                   Interface Identifier StopN                  |
    +---------------------------------------------------------------+
    /                                                               /
    \               Additional Interface Identifiers                \

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    /                     of Tag Type 0x1 or 0x8                    /
    \                                                               \
    +-------------------------------+-------------------------------+
    |         Tag = 0x001b          |            Length             |
    +- - - - - - - - - - - - - - - -+- - - - - - - - - - - - - - - -+
    \                                                               \
    /                        Protocol Limits                        /
    \                                                               \
    +-------------------------------+-------------------------------+
    |         Tag = 0x0004          |            Length             |
    +- - - - - - - - - - - - - - - -+- - - - - - - - - - - - - - - -+
    \                                                               \
    /                           Info String                         /
    \                                                               \
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

     The format of the resulting ASPAC ACK message for M3UA, ISUA, SUA
  and TUA is as follows:[4]

     0                   1                   2                   3
     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    |         Tag = 0x0006          |            Length = 8         |
    +- - - - - - - - - - - - - - - -+- - - - - - - - - - - - - - - -+
    \                                                               \
    /                        Routing Context                        /
    \                                                               \
    +-------------------------------+-------------------------------+
    |         Tag = 0x001b          |            Length             |
    +- - - - - - - - - - - - - - - -+- - - - - - - - - - - - - - - -+
    \                                                               \
    /                        Protocol Limits                        /
    \                                                               \
    +-------------------------------+-------------------------------+
    |         Tag = 0x0004          |            Length             |
    +- - - - - - - - - - - - - - - -+- - - - - - - - - - - - - - - -+
    \                                                               \
    /                           Info String                         /
    \                                                               \
    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

     To indicate restrictions on the maximum sizes for transfer of data,
  the SGP and IPSP MUST include the Protocol Limits parameter in the
  ASPAC ACK message.

     No other changes to the ASPAC ACK message format are provided by
  this extension.

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Notes for Section 3

  [1]  See, for example, Section 3 of the specific UA document
       [M2UA..TUA].

  [2]  EDITOR'S NOTE:-  The parameter tag values shown as 0x001b will
       be assigned by IANA within the common parameter range of the
       SIGTRAN UAs and may change its value in further versions of
       this document.

  [3]  EDITOR'S NOTE:-  The parameter tag values shown as 0x001b will
       be assigned by IANA within the common parameter range of the
       SIGTRAN UAs and may change its value in further versions of
       this document.

  [4]  EDITOR'S NOTE:-  The parameter tag values shown as 0x001b will
       be assigned by IANA within the common parameter range of the
       SIGTRAN UAs and may change its value in further versions of
       this document.

4.  Procedures

     The following procedures are provided in extension to the UA
  procedures by SGINFO.

4.1.  ASP Management Procedures

4.1.1.  ASP Active Procedures

     In extension of the "ASP Active Procedures" of the UAs[2], SGINFO
  provides the following procedures:

     Whenever an SGP, as a part of the normal UA procedures, sends an
  ASP Active Acknowledgment (ASPAC ACK) to an ASP, it MAY include the
  Protocol Limits parameter indicating the protocol data size limits
  that apply to the Application Server associated with the Routing
  Contexts (Interface Identifiers) specified or implied in the ASPAC ACK
  message.  Where the protocol limits only apply to one Application
  Server, the SGP SHOULD NOT include more than one Routing Context
  (Interface Identifier) in the ASPAC ACK response.  That is, in
  response to an ASPAC message containing multiple Routing Contexts
  (Interface Identifiers), the SGP SHOULD send a separate ASPAC ACK
  reply for each Routing Context (Interface Identifier) for which it
  includes the Protocol Limits parameter.

     If an SG discovers that the protocol data size limits has changed
  due to an event, (such as a failure in the SS7 network), the SGP MAY
  send an unsolicited ASPAC ACK message containing the new protocol
  limits.

     Whenever an ASP receives an ASPAC ACK message as part of the normal
  UA procedures, or receives an unsolicited ASPAC ACK for an active
  Application Server (AS), the ASP will apply the new protocol data size

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  limits to the Application Server.

4.2.  Interworking

     Whenever an SGP receives an ERR("Invalid Parameter") message
  indicating the Protocol Limits parameter in response to a sent ASPAC
  ACK message containing a Protocol Limits parameter, the SGP SHOULD re-
  attempt by sending the ASPAC ACK without a Protocol Limits parameter.

5.  Examples

5.1.  ASP and SGP both supporting Protocol Limits

     An example of an ASP and SGP both supporting Protocol Limits is
  illustrated in Figure 1.

     As illustrated in Figure 1, the sequence of events for this example
  are as follows:

   (1)   An Application Server at an ASP begins in the AS-DOWN or AS-
         INACTIVE state.

   (2)   The ASP activates an Application Server by sending an ASPAC
         message.

   (3)   The SGP responds with an ASPAC ACK message containing the
         current protocol limits in the Protocol Limits parameter.  The
         ASP applies these protocol limits to the Application Server
         upon activation.

                      SGP                             ASP
                       |            ASPUP              |
                       |<------------------------------|
                       |          ASPUP ACK            |
               (1)     |------------------------------>|
                       |                               |
                       |            ASPAC              |
               (2)     |<------------------------------|
                       |                               |
                       |   ASPAC ACK(Protocol Limits)  |
               (3)     |------------------------------>|
                       |                               |
                       .                               .
                       .                               .
                       .                               .
                       |   ASPAC ACK(Protocol Limits)  |
               (4)     |------------------------------>|
                       |                               |

         Figure 1.  ASP and SGP both supporting Protocol Limits

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   (4)   Later, when the SGP notes a change to protocol limits, the SGP
         sends an unsolicited ASPAC ACK message containing the updated
         Protocol Limits.  The ASP applies these updated protocol limits
         to the Application Server upon receipt.

5.2.  SGP only supporting Protocol Limits

5.2.1.  ASP ignores Protocol Limits

     An example of an SGP only supporting Protocol Limits where the ASP
  ignores the Protocol Limits parameter is illustrated in Figure 2.

     As illustrated in Figure 2, the sequence of events for this example
  are as follows:

   (1)   An Application Server at an ASP begins in the AS-DOWN or AS-
         INACTIVE state.

   (2)   The ASP activates an Application Server by sending an ASPAC
         message.

   (3)   The SGP responds with an ASPAC ACK message containing the
         current protocol limits in the Protocol Limits parameter.  The
         ASP ignores the Protocol Limits parameter and, instead, relies
         upon internal configuration data to determine protocol limits.

   (4)   Later, when the SGP notes a change to protocol limits, the SGP
         sends an unsolicited ASPAC ACK message containing the updated
         Protocol Limits.  The ASP ignores the Protocol Limits parameter
         and, instead, relies upon internal configuration data to
         determine protocol limits.

                      SGP                             ASP
                       |            ASPUP              |
                       |<------------------------------|
                       |          ASPUP ACK            |
               (1)     |------------------------------>|
                       |                               |
                       |            ASPAC              |
               (2)     |<------------------------------|
                       |                               |
                       |   ASPAC ACK(Protocol Limits)  |
               (3)     |------------------------------>|
                       |                               |
                       .                               .
                       .                               .
                       .                               .
                       |   ASPAC ACK(Protocol Limits)  |
               (4)     |------------------------------>|
                       |                               |

         Figure 2.  ASP and SGP both supporting Protocol Limits

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5.2.2.  ASP refuses Protocol Limits

     An example of an SGP only supporting Protocol Limits where the ASP
  refuses the Protocol Limits parameter is illustrated in Figure 3.

     As illustrated in Figure 3, the sequence of events for this example
  are as follows:

   (1)   An Application Server at an ASP begins in the AS-DOWN or AS-
         INACTIVE state.

   (2)   The ASP activates an Application Server by sending an ASPAC
         message.

   (3)   The SGP responds with an ASPAC ACK message containing the
         current protocol limits in the Protocol Limits parameter.

   (4)   The ASP refuses the ASPAC ACK message and responds with an
         ERR("Invalid Parameter") message indicating the Protocol Limits
         parameter as invalid.

   (5)   The SGP re-attempts and sends the ASPAC ACK message without the
         Protocol Limits parameter and marks the ASP as incapable of
         processing protocol limits.

                      SGP                             ASP
                       |            ASPUP              |
                       |<------------------------------|
                       |          ASPUP ACK            |
               (1)     |------------------------------>|
                       |                               |
                       |            ASPAC              |
               (2)     |<------------------------------|
                       |                               |
                       |   ASPAC ACK(Protocol Limits)  |
               (3)     |------------------------------>|
                       |                               |
                       |    ERR("Invalid Parameter")   |
               (4)     |<------------------------------|
                       |                               |
                       |          ASPAC ACK            |
               (5)     |------------------------------>|
                       |                               |
                       .                               .
                       .                               .
                       .                               .
                       |                               |
               (6)     |                               |
                       |                               |

         Figure 3.  ASP and SGP both supporting Protocol Limits

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   (6)   When a subsequent change in the protocol limits at the SGP
         occurs, the SGP does nothing (the ASP is marked as incapable of
         handling protocol limits).

5.3.  ASP only supporting Protocol Limits

     An example of an ASP only supporting Protocol Limits is illustrated
  in Figure 4.

     As illustrated in Figure 4, the sequence of events for this example
  are as follows:

   (1)   An Application Server at an ASP begins in the AS-DOWN or AS-
         INACTIVE state.

   (2)   The ASP activates an Application Server by sending an ASPAC
         message.

   (3)   The SGP responds with an ASPAC ACK message not containing the
         Protocol Limits parameter.

   (4)   The ASP receiving the ASPAC ACK with no Protocol Limits
         parameter relies upon internal configuration data to determine
         protocol limits.

6.  Security

     SGINFO does not introduce any new security risks or considerations
  that are not already inherent in the UA [M2UA..TUA] Please see the
  SIGTRAN Security document [SIGSEC] for security considerations and
  recommendations that are applicable to each of these UAs.

                      SGP                             ASP
                       |            ASPUP              |
                       |<------------------------------|
                       |          ASPUP ACK            |
               (1)     |------------------------------>|
                       |                               |
                       |            ASPAC              |
               (2)     |<------------------------------|
                       |                               |
                       |          ASPAC ACK            |
               (3)     |------------------------------>|
                       |                               |
                       |                               |
               (4)     |                               |
                       |                               |

         Figure 4.  ASP and SGP both supporting Protocol Limits

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7.  IANA Considerations

7.1.  Protocol Extensions

     SGINFO provides an additional Protocol Limits message parameter to
  the common parameter range of the SIGTRAN UAs [M2UA..TUA]:

   (a)   The parameter is named the Protocol Limits parameter.

   (b)   The structure of the Protocol Limits parameter field conforms
         to the UA general TLV format and is described in detail in
         Section 3.1.1.

   (c)   The detailed definition of each component of the Protocol
         Limits parameter values is described in Section 3.1.1.

   (d)   This document also provides a detailed description of the
         intended use of the Protocol Limits[1] parameter, and in which
         messages the Protocol Limits parameter should appear, how many
         times, and when.

Notes for Section 7

  [1]  EDITOR'S NOTE:-  The Protocol Limits parameter tag value shown
       throughout this document as 0x001b will be assigned by IANA
       within the common parameter range of the SIGTRAN UAs and may
       change its value in further versions of this document.

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0.  Revision History

     This section provides historical information on the changes made to
  this draft.  This section will be removed from the document when the
  document is finalized.

0.3.  Changes from Version 0.2 to Version 0.3

   + added list of abbreviations.

   + moved history section.

   + updated revision and dates.

   + updated references.

   + split reference section.

   + updated secuirty section.

   + moved notes to end.

0.2.  Changes from Version 0.1 to Version 0.2

   + added this section,

   + updated references, release version and dates,

   + minor corrections,

   + updated postscript diagrams,

   + updated author's address.

0.1.  Changes from Version 0.0 to Version 0.1

0.0.  Version 0.0

0.0.0.  Change Log

    $Log: draft-bidulock-sigtran-sginfo-03.me,v $
    Revision 0.8.2.1  2003/08/01 12:23:16  brian
    Added abbreviations, updated format.

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R.  References

R.1.  Normative References

  [M2UA]  Morneault, K., Dantu, R., Sidebottom, G., Bidulock, B. and
       Heitz, J., "Signaling System 7 (SS7) Message Transfer Part 2
       (MTP2) - User Adaptation Layer," RFC 3331, Internet Engineering
       Task Force - Signalling Transport Working Group (September,
       2002).

  [M3UA]  Sidebottom, G., Morneault, K. and Pastor-Balbas, J., (eds),
       "Signaling System 7 (SS7) Message Transfer Part 3 (MTP3) - User
       Adaptation Layer (M3UA)," RFC 3332, Internet Engineering Task
       Force - Signalling Transport Working Group (September, 2002).

  [SUA]  Loughney, J., Sidebottom, G., Coene, L., Verwimp, G., Keller,
       J. and Bidulock, B., "SS7 SCCP-User Adaptation Layer (SUA),"
       draft-ietf-sigtran-sua-15.txt, Internet Engineering Task Force -
       Signalling Transport Working Group (June 30, 2003).  Work In
       Progress.

  [ISUA]  Bidulock, B., "SS7 ISUP-User Adaptation Layer (ISUA)," <draft-
       bidulock-sigtran-isua-01.txt>, Internet Engineering Task Force -
       Signalling Transport Working Group (July 26, 2003).  Work In
       Progress.

  [TUA]  Bidulock, B., "SS7 TCAP-User Adaptation Layer (TUA)," <draft-
       bidulock-sigtran-tua-02.txt>, Internet Engineering Task Force -
       Signalling Transport Working Group (July 26, 2003).  Work In
       Progress.

  [RFC 2960]  Stewart, R., Xie, Q., Morneault, K., Sharp, C.,
       Schwarzbauer, H. J., Taylor, T., Rytina, I., Kalla, H., Zhang, L.
       and Paxson, V., "Stream Control Transmission Protocol (SCTP),"
       RFC 2960, The Internet Society (February 2000).

  [RFC 2119]  Bradner, S., "Key words for use in RFCs to Indicate
       Requirement Levels," RFC 2119 - BCP 14, The Internet Society
       (March 1997).

  [SIGSEC]  Loughney, J., Tuexen, M. and Pastor-Balbas, J., "Security
       Considerations for SIGTRAN Protocols," <draft-ietf-sigtran-
       security-03.txt>, Internet Engineering Task Force - Signalling
       Transport Working Group (June 29, 2003).  Work In Progress.

R.2.  Informative References

  [Q.704]  ITU, "Message Transfer Part - Signalling Network Functions
       and Messages," ITU-T Recommendation Q.704, ITU-T
       Telecommunication Standardization Sector of ITU, Geneva (March
       1993).  (Previously "CCITT Recommendation")

  [Q.711]  ITU, "Functional Description of Signalling Connection Control

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Internet Draft                  UA SGINFO                  July 27, 2003

       Part," ITU-T Recommendation Q.711, ITU-T Telecommunication
       Standardization Sector of ITU, Geneva (March 1993).  (Previously
       "CCITT Recommendation")

  [Q.771]  ITU, "Signalling System No. 7 - Functional Description of
       Transaction Capabilities," ITU-T Recommendation Q.771, ITU-T
       Telecommunication Standardization Sector of ITU, Geneva (March
       1993).  (Previously "CCITT Recommendation")

  [X.213]  ITU, "OSI - Network Service Definition," ITU-T Recommendation
       X.213 (ISO/IEC 8072), ITU-T Telecommunication Standardization
       Sector of ITU, Geneva (November, 1995).  (Previously "CCITT
       Recommendation")

  [NPI]  International, UNIX., "Network Provider Interface
       Specification," NPI Revision 2.0.0, UNIX International
       Publication, Parsippany, New Jersey (August 17, 1992).
       http://www.openss7.org/doc/npi.pdf

  [X.214]  ITU, "Transport Service Definitions for Open Systems
       Interconnection (OSI) for CCITT Applications," ITU-T
       Recommendation X.214 (ISO/IEC 8072), ITU-T Telecommunication
       Standardization Sector of ITU, Geneva (November, 1995).
       (Previously "CCITT Recommendation")

  [X.219]  ITU, "Information processing systems - Text Communication,
       Remote Operations: Model, Notation and Service Definition," ITU-T
       Recommendation X.219 (ISO/IEC 9072-1), ITU-T Telecommunication
       Standardization Sector of ITU, Geneva (n.d.).  (Previously "CCITT
       Recommendation")

  [TPI]  Open Group, "Transport Provider Interface Specification," TPI
       Version 2, Draft 2, Open Group Publication (1999).
       http://www.opengroup.org/onlinepubs/

  [ISO 8649]  International Standards Organization, "Information
       Processing Systems - Open Systems Interconnection - Service
       Definition for the Association Control Service Element," ISO
       8649:1988, International Standards Organization (1988).

  [ISO 8650]  International Standards Organization, "Information
       Processing Systems - Open Systems Interconnection - Protocol
       Specification for the Association Control Service Element," ISO
       8650:1988, International Standards Organization (1988).

  [XNS]  Open Group, "Technical Standard: Network Services (XNS)," XNS
       Issue 5.2 Draft 2.0 [ISBN: 1-85912-241-8], Open Group Publication
       (1999).  http://www.opengroup.org/onlinepubs/

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Author's Addresses

  Brian Bidulock                                  Phone: +1-780-490-1141
  OpenSS7 Corporation                        Email: bidulock@openss7.org
  1469 Jeffreys Crescent                     URL: http//www.openss7.org/
  Edmonton, AB  T6L 6T1
  Canada

  This draft expires January 2004.

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                        List of Illustrations

  Figure 1. ASP and SGP both supporting Protocol Limits ...........   11
  Figure 2. ASP and SGP both supporting Protocol Limits ...........   12
  Figure 3. ASP and SGP both supporting Protocol Limits ...........   13
  Figure 4. ASP and SGP both supporting Protocol Limits ...........   14

                          Table of Contents

  Status of this Memo .............................................    1
  Copyright .......................................................    1
  Abstract ........................................................    1
  Contents ........................................................    2
  1 Introduction ..................................................    2
  1.1 Scope .......................................................    2
  1.2 Abbreviations ...............................................    2
  1.3 Terminology .................................................    2
  1.4 Overview ....................................................    3
  1.4.1 Existing Information Management ...........................    3
  1.4.2 SGINFO Information Management .............................    3
  Notes for Section 1 .............................................    4
  2 Conventions ...................................................    4
  3 Protocol Elements .............................................    4
  3.1 Parameters ..................................................    4
  3.1.1 Protocol Limits ...........................................    4
  3.2 Messages ....................................................    8
  3.2.1 ASP Active Acknowledgment (ASPAC ACK) .....................    8
  Notes for Section 3 .............................................   10
  4 Procedures ....................................................   10
  4.1 ASP Management Procedures ...................................   10
  4.1.1 ASP Active Procedures .....................................   10
  4.2 Interworking ................................................   11
  5 Examples ......................................................   11
  5.1 ASP and SGP both supporting Protocol Limits .................   11
  5.2 SGP only supporting Protocol Limits .........................   12
  5.2.1 ASP ignores Protocol Limits ...............................   12
  5.2.2 ASP refuses Protocol Limits ...............................   13
  5.3 ASP only supporting Protocol Limits .........................   14
  6 Security ......................................................   14
  7 IANA Considerations ...........................................   15
  7.1 Protocol Extensions .........................................   15
  Notes for Section 7 .............................................   15
  0 Revision History ..............................................   16
  0.3 Changes from Version 0.2 to Version 0.3 .....................   16
  0.2 Changes from Version 0.1 to Version 0.2 .....................   16
  0.1 Changes from Version 0.0 to Version 0.1 .....................   16
  0.0 Version 0.0 .................................................   16
  0.0.0 Change Log ................................................   16
  R References ....................................................   17
  R.1 Normative References ........................................   17
  R.2 Informative References ......................................   17
  Author's Addresses ..............................................   19
  List of Illustrations ...........................................   20

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  Table of Contents ...............................................   20

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Full Copyright Statement

  Copyright (C) The Internet Society (2003).  All Rights Reserved.

     This document and translations of it may be copied and furnished to
  others, and derivative works that comment on or otherwise explain it
  or assist in its implementation may be prepared, copied, published and
  distributed, in whole or in part, without restriction of any kind,
  provided that the above copyright notice and this paragraph are
  included on all such copies and derivative works.  However, this
  document itself may not be modified in any way, such as by removing
  the copyright notice or references to the Internet Society or other
  Internet organizations, except as needed for the purpose of developing
  Internet standards in which case the procedure for copyrights defined
  in the Internet Standards process must be followed, or as required to
  translate into languages other than English.

     The limited permission granted above are perpetual and will not be
  revoked by the Internet Society or its successors or assigns.

     This document and the information contained herein is provided on
  an "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
  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
  MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

Acknowledgement

     Funding for the RFC Editor function is currently provided by the
  Internet Society.

B. Bidulock                    Version 0.3                       Page 22


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