3GPP and SIP-AAA requirements

1
3GPP and SIP-AAA requirements

• 3GPP CN4 WG
• Presented Johanna Wild
• Motorola GmbH
• mailtoJohanna.Wild_at_motorola.com

2
Overview

• 3GPP Relationships - SIP AAA
• 3GPP 3GPP2 Commonalities
• 3GPP Requirements
• 3GPP Approach
• 3GPP Documentation Structure
• 3GPP Documentation Content
• 3GPP Goals

3
3GPP Relationships SIP-AAA (What do we have in
3GPP?)

• SIP proxy servers (S-CSCF, I-CSCF) with
  requirements for authentication and authorization
• A Home Subscriber Server (HSS) containing
  subscriber/service/security profiles relevant for
  SIP proxies.

Cx interface based on Diameter SIP proxies get
authorisation and authentication information
Home
HSS
S-CSCF
REGISTER/INVITE
I-CSCF
REGISTER/INVITE
P-CSCF
REGISTER/INVITE
SIP proxy servers
SIP-based interfaces
4
3GPP-3GPP2 points in common (What we already
have in draft-calhoun-sip-aaa-reqs)
Location database
AAAH
Cx
HSS (3GPP)
6. AAA Request
7. AAA Resp
3. AAA Req
4. AAA Resp
SIP Central Point of Contact - SCPC (I-CSCF)
Anchor SIP proxy (S-CSCF)
5. SIP REGISTER
8. 200 OK
9. 200 OK
2. SIP REGISTER
SIP Point of Contact Visited - SPCV (P-CSCF)
1. SIP REGISTER
10. 200 OK
SIP Client
5
3GPP Requirements(What we have to add
todraft-calhoun-sip-aaa-reqs?)

• When the SCPC receives SIP REGISTER it will issue
  a AAA message to the Home AAA Server (AAAH). The
  AAA message may include information from the SIP
  message (e.g. From)
• In 3GPP the SCPC shall select an Anchor SIP proxy
  for the user, which will act as the client's
  assigned SIP server (registrar).
• In 3GPP the authorization period may not be
  controlled by the AAA server.
• Location query using AAA infrastructure In 3GPP
  the SCPC shall send an authorization request to
  the AAAH, in order to determine whether the
  session can be established and to find the
  location of the Anchor SIP server and SIP Client

6
3GPP Requirements (What we have to add
todraft-calhoun-sip-aaa-reqs?)

• The AAA infrastructure MUST be able to
  distribute (push or pull) subscriber/service/secur
  ity profiles to the relevant SIP servers based on
  policies.
• The AAAH MUST be able to update the location of
  the assigned SIP server for the user performing
  SIP registration to the location database.
• The AAAH MUST be able to initiate user
  de-registration.
• The AAAH MUST be able to distribute relevant
  information to the SCPC for the selection of the
  appropriate Anchor SIP proxy for the user.

7
3GPP Approach(How will we go for it?)

• AAA WG is developing Diameter applications based
  on requirements defined by other WGs (ROAMOPS,
  NASREQ). SIPPING is the right WG to develop the
  requirements for the connection of SIP nodes to
  AAA infrastructure.
• We will bring the new requirements to extend
  draft-calhoun-sip-aaa-reqs to the SIPPING email
  list.
• We will use the requirements to develop a new
  Diameter application in the AAA WG.
• The new Diameter application would be referenced
  from 3GPP technical specifications following the
  structure shown in the following slides

8
3GPP Documentation Structure (A picture)
3GPP
IETF
TS 23.228 (SA2)
DRAFT 3G-SIP-AAA (SIPPING)
TS 24.228 (CN1)
TS 29.228 (CN4)
TS 29.229 (CN4)
DRAFT 3GPP-DMA (AAA)
9
3GPP Documentation Content (A list of content
lists)

• 3G TS 23.228 IP Multimedia Subsystem Stage
  2
• High level concepts and requirements
• Architectural framework
• High level end-to-end information flow samples
• 3G TS 24.228 - Signaling flows for the IP
  Multimedia call control based on SIP and SDP
  Stage 2/3
• End-to-end signaling flows for IP Multimedia Call
  Control
• Interactions with flows over the interface to the
  Application Servers
• Interactions with flows over the Cx interface

10
3GPP Documentation Content (Another list of
content lists)

• 3G TS 29.228
• Use cases for the Cx interface
• Operations over the Cx interface
• Mapping of Cx operations and related parameters
  to Diameter Commands and AVPs
• Mapping 3GPP node names to IETF names
• Pointers to protocol details specifications
• 3G TS 29.229
• Description of Diameter Base Protocol Usage
• Definition of Diameter Multimedia Application
  Commands and Result Code AVPs
• Definition of Diameter Multimedia Application
  AVPs
• Overlap with planned draft-czoma-diameter-multimed
  ia-application-00.txt

11
3GPP Documentation Content (The last list of
content lists)

• draft-calhoun-sip-aaa-reqs-02.txt
• Common 3GPP and 3GPP2 AAA requirements for IP
  Multimedia applications based on SIP and SDP
• Specific 3GPP2 AAA requirements for IP Multimedia
  applications based on SIP and SDP
• Specific 3GPP AAA requirements for IP Multimedia
  applications based on SIP and SDP
• planned draft-czoma-diameter-multimedia-applicatio
  n-00.txt
• Definition of Diameter Multimedia Application
  Commands and Result Code AVPs
• Definition of Diameter Multimedia Application
  AVPs
• Overlap with 3G TS 29.229

12
3GPP Goals(What else do we need?)

• To re-introduce the AAA requirements including
  3GPP in a SIP environment to the charter of
  SIPPING WG.
• To include the AAA requirements including 3GPP in
  a SIP environment to the list of deliverables of
  SIPPING WG.
• The draft-calhoun-sip-aaa-reqs should be stable
  by November 2001 in order to serve as a basis of
  the work in AAA WG in time.
• The draft-czoma-diameter-multimedia-application
  based on these requirements, planned for
  September 2001 submission to the AAA WG, needs to
  go to proposed standards status within a
  timescale which will allow for it, to be
  referenced by 3GPP.