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Media Gateway Control (Megaco)                              Mike Kallas
Internet Draft                                          Nortel Networks
Document: draft-ietf-megaco-naspkg-00.txt             Zacharias Bilalis
Category: Standards Track                                       Siemens
                                                             March 2000


                        Megaco/H.248 NAS Package


Status of this Memo

   This document is an Internet-Draft and is in full conformance with
   all provisions of Section 10 of RFC2026.

   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.


1. Abstract

   This document is work in progress and defines a NAS Package for the
   Megaco/H.248 protocol. It is intended to satisfy the requirements in
   section 11.2.5 of the Megaco/H.248 requirements document [5].


2. Conventions used in this document

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED",  "MAY", and "OPTIONAL" in
   this document are to be interpreted as described in RFC-2119 [1].


3. ABBREVIATIONS

   NAS: Network Access Server

   VPN: Virtual Private Network





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4. NAS PACKAGE

   PackageID: nas, 0x0022

   Version: 1

   Extends: none

   This package supports the functionality of a Media Gateway as NAS
   (Network Access Server), providing support for dial-in access to the
   NAS.

4.1   Properties

   VPN id
     PropertyId: vpnid (0x0001)
     Description:
       identifies the VPN to which this termination is to be
       connected
     Type: octet string as defined in RFC2685 [4]
     Possible Values: vpnid
     Defined in: TerminationState
     Characteristics: read/write

4.2 Events

4.2.1 NAS Failure

   EventID: nasfail (0x0001)
   Description:
     indicates a failure in the processing of the access attempt due
     to external or internal reasons.

   EventDescriptor Parameters:
     none added by this package

   ObservedEventDescriptor Parameters:

     Error code
       ParameterID: ec (0x0001)
       Description: describes the failure reason
       Type: integer, 0 to 99
       Possible values:
         0: NAS internal error
         1: AAA server unavailable

4.2.2 Authorization Result

   EventID: authres (0x0002)

   Description:
     This event reports the outcome of a request for authorization of

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     the network access request

   EventDescriptor Parameters:
     none added by this package

   ObservedEventDescriptor Parameters:

     result
       ParameterID: res (0x0001)
       Description:
         outcome of the service request to the AAA server (see for
         example IETF RFC 2138 (RADIUS) [2])
       Type: enumeration
       Possible values:
         succ (0x0000)  service request was successful
         den  (0x0001)  service request was denied

4.2.3 Call back Request

   EventID: cbr (0x0003)

   Description:
     The call back event is used to notify that a call-back has been
     requested by the  AAA server during the initial phase of a data
     connection (see for example IETF RFC 2138  (RADIUS) [2]). The
     event report includes the telephone number to which the call is to
     be made.

   EventDescriptor Parameters:
     none added by this package

   ObservedEventDescriptor Parameters:

     Number to be called
       ParameterID: cbn (0x0001)
       Description:
         the call-back number provided by the AAA server
       Type: string of digits
       Possible values:
         location-dependent.  The actual form is outside the scope of
         this specification.

4.3 Signals

   None

4.4 Statistics

   None

4.5 Procedures


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   None


5. References

   [1] Bradner, S., "Key words for use in RFCs to Indicate Requirement
   Levels", BCP 14, RFC 2119, March 1997

   [2] Rigney, C., et al, Remote Authentication Dial In Service
   (RADIUS), RFC 2138, April 1997

   [3] Townsley, W., et al, Layer Two Tunneling Protocol(L2TP), RFC
   2661, August 1999

   [4] B. Fox and B. Gleeson, Virtual Private Networks Identifier, RFC
   2685, September 1999

   [5] N. Greene, M. Ramalho, B. Rosen, Media Gateway control protocol
   architecture and requirements, RFC number TBD, March 2000 (currently
   draft-ietf-megaco-reqs-10.txt, February 2000)


6. AUTHOR'S ADDRESSES

   Mike Kallas
   Nortel Networks
   P.O. Box 833805
   Richardson, Texas 75083-3805
   USA
   Email: mkallas@nortelnetworks.com

   Zacharias Bilalis
   Siemens
   Schertlinstr. 8
   81379 Munich
   Germany
   Email:  zacharias.bilalis@icn.siemens.de
















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