1. World Class Standards Common IMS in TISPAN SA3LITISPANWG7_08_02 Scott CADZOW

2. World Class Standards IMS in NGN  NGN brings together many access technologies to a common service enabling platform  IMS serves as the common service enabling platform  Access technologies are managed in their own abstraction layer  NASS (Network Access Sub-System)  QoS and access privileges are managed through an additional abstraction layer  RACS (Resource and Admission Control System)  Users may use many access technologies to access services and may use them concurrently or sequentially within a single session  This requires IMS to be supportive of any NASS or RACS technology  Has to ensure that NASS/RACS requirements are devolved to the correct layer 2

3. World Class Standards 3 The goals for NGN LI standardisation  Conformance to International User Requirement  As annex to COM 96/C329/01: "European Union Council Resolution COM 96/C329/01 of 17 January 1995 on the Lawful Interception of Telecommunications"  As found in TS 101 331 "Telecommunications security; Lawful Interception (LI); Requirements of Law Enforcement Agencies“  Compliance with objectives of ECN&S regulatory framework  The NGN consists of many ECN and many ECS with loose relationships  Clear identification of Points of Interception  What is available at different PoI  Correlation between different PoI  Prevention of duplication of invocation of interception at PoIs

4. World Class Standards Documents to integrate  TISPAN  TS 187 005, in draft for NGN-R2  3GPP SA3-LI  33.107, stage 2 in draft for R8  33.108, stage 3 in draft for R8  TC LI  TS 102 232, handover to IP networks  ES 201 671/TS 101 671, handover to Circuit Switched networks 4

5. World Class Standards Technologies supported by the NGN  Separation of ECN and ECS  ECS technologies:  IMS (care of 3GPP)  PES (ISDN/PSTN on soft-switches)  IPTV  Corporate services  ECN technologies:  ADSL  PLMN Radio (care of 3GPP)  LAN radio (mostly care of 3GPP)  PSTN/ISDN 5

6. World Class Standards Interception in the NGN - identity  ECS identity  MSISDN  E.164  SIP-url (sip-user@sip-domain)  Other …  ECN identity  IMSI  Chap credential and identity 6

7. World Class Standards Interception in the NGN - signalling  ECS  IMS (SIP) signalling REGISTER (equivalent to MAP, found at HLR/VLR like entities) INVITE, ACK, BYE, CANCEL, OPTIONS (found at CSCF entities)  PES/PSS ISDN emulation signalling found at Signalling gateways (H.248) SIGTRAN, SIP-I  ECN  Access signalling (no service), CHAP, PPP etc. 7

8. World Class Standards Interception in the NGN - content  ECS  No traffic content  Some extended signalling content in SDP/SIP  ECN  IP traffic content TCP, UDP, RTP  Non-IP traffic content 8

9. World Class Standards Problems in NGN, ECN&S interception  Correlation across ECN/ECS boundary  IMS into NASS via RACS (Gq’) for QoS transport control  Resource requests from ECS to ECN not personalised  Dynamic assignment of NASS and RACS without IMS intervention  One service many transport offerings  Ownership break across ECN/ECS boundary (one CSP for each of ECN and ECS)  No correlation as there is no common visibility to CSP 9

10. World Class Standards IMS interception  IMS is an instance of ECS technology  Independent of ECN technologies  IMS is a platform  No services per-se  Expectation from NGN  Clear identification of PoI for various IMS capabilities  Common capability for all IMS implementations 10

11. World Class Standards Concerns to be addressed  Structure of IMS interception  One clause for any technology (IMS is an ECS technology and any ECN technology can/should be able to access it)  Reference from TS 187 005 to 33.107  Annex showing normative application from TS 187 005 to 33.108  Timetable for IMS interception  Required for NGN-R2  TS 187 005 to be finalised very soon and needs to have IMS interception included Ideally by reference to 33.107 and 33.108 If not by reference then in a transferable way (i.e. defined in TISPAN for movement to 33.107 and 33.108 when appropriate) 11