3GPP and SIP-AAA requirements 3GPP CN4 WG Presented: Johanna Wild Motorola GmbH mailto:Johanna.Wild@motorola.com

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

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 HSS Home S-CSCF REGISTER/INVITE I-CSCF Visited RAN SGSN GGSN REGISTER/INVITE REGISTER/INVITE P-CSCF SIP proxy servers SIP-based interfaces

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 Anchor SIP proxy (S-CSCF) SIP Central Point of Contact - SCPC (I-CSCF) 5. SIP REGISTER 8. 200 OK 9. 200 OK 2. SIP REGISTER SIP Point of Contact Visited - SPCV (P-CSCF) 10. 200 OK 1. SIP REGISTER SIP Client

3GPP Requirements (What we have to add to draft-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

3GPP Requirements (What we have to add to draft-calhoun-sip-aaa-reqs?) The AAA infrastructure MUST be able to distribute (push or pull) subscriber/service/security 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.

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

3GPP Documentation Structure (A picture) 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)

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

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-multimedia-application-00.txt

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-application-00.txt Definition of Diameter Multimedia Application Commands and Result Code AVPs Definition of Diameter Multimedia Application AVPs Overlap with 3G TS 29.229

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.