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SIP in 3GPP

SIP in 3GPP. August 12th, 2000 Adam Roach adam.roach@ericsson.com. Disclaimer.

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SIP in 3GPP

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  1. SIP in 3GPP August 12th, 2000 Adam Roach adam.roach@ericsson.com

  2. Disclaimer Some terms used in this presentation are trademarks or registered trademarks of their respective owners. The use of these terms is not an endorsement of the related product or corporation; the terms are included only to give the audience concrete example with which they are (hopefully) already familiar.

  3. Applications & Services *) Multimedia IP Networks R-SGW *) IP Multimedia Domain CSCF (multimedia by SIP, IETF RFC2543) PS Domain EIR MRF MGCF PSTN/ Legacy/External CS Domain (multimedia by ITU H.324M) 3GPP Network Model Legacy Alternative mobile Acces Network s Network SCP CSCF Mw Mh Ms CAP Mm Cx HSS *) CSCF Gr Mg Mr Gi Gi Gf Gi T-SGW *) Gc GGSN SGSN Mc Iu Gi Gn Iu TE MT UTRAN MGW MGW R Uu Nb Iu Mc Mc Nc MSC server GMSC server T-SGW *) CAP CAP D C Applications HSS *) R-SGW *) & Services *) Mh

  4. Proxy CSCF:Provides emergency service breakout, triggers for locally-provided services, and number normalizing (per local dialing plan) Home A Home B HSS HSS 8 7 4 3 9 6 5 S-CSCF I-CSCF S-CSCF I-CSCF 14 15 16 10 13 17 2 Visited B Visited A P-SCSF P-CSCF 11 12 18 1 GGSN GGSN SGSN SGSN Radio Access Network Radio Access Network B A Different Kinds of CSCFs

  5. Home A Home B Interrogating CSCF:Queries the HSS to find the correct S-CSCF. First point of contact for incoming call signalling. HSS HSS 8 7 4 3 9 6 5 S-CSCF I-CSCF S-CSCF I-CSCF 14 15 16 10 13 17 2 Visited B Visited A P-SCSF P-CSCF 11 12 18 1 GGSN GGSN SGSN SGSN Radio Access Network Radio Access Network B A Different Kinds of CSCFs

  6. Home A Home B HSS HSS Serving CSCF:Provides subscriber services. 8 7 4 3 9 6 5 S-CSCF I-CSCF S-CSCF I-CSCF 14 15 16 10 13 17 2 Visited B Visited A P-SCSF P-CSCF 11 12 18 1 GGSN GGSN SGSN SGSN Radio Access Network Radio Access Network B A Different Kinds of CSCFs

  7. 3GPP SIP Decisions • SIP from terminal to network • SIP between network call nodes

  8. General Principles • S-CSCFs may have different capabilities. • Firewalling must be possible. • Terminal and node behaviours should be consistent, regardless of whether the user is roaming. • Follow IETF standards as much as possible. • Service nodes are access independent. • Serving CSCFs may reside in either home or roamed-to network.

  9. Worldcom Yahoo! PSTN GW owned by traditional telco. Calling users subscribe; authorization/billing based on challenge/response model Service Node Service Node Pay-per-view movie service using RTSP, hosted by backbone provider Service Node Peer IP backbone networks PSTN GGSN SGSN CMTS My own machine with a multicast chat server for all my friends, connected through my broadband access Broadband Access Providers (Wireless, Cable, DSL, etc.) (Ideal) Access Independent Network IP IP IP IP Service Node

  10. IP IP PSTN PSTN PSTN IP IP Short Term Network Picture Access Access Firewall Firewall Call Control IP Backbone Call Control Access Firewall Firewall PSTN Call Control Call Control Access

  11. Home HSS Location Profile I-CSCF S-CSCF Visited P-CSCF GGSN SGSN Radio Access Network Selection of ServingNode Location(Home Execution) 3 4 6 7 8. OK 5. REGISTER 2. REGISTER 9. OK 1. REGISTER 10. OK

  12. Selection of ServingNode Location(Non-Roaming) Home HSS Location Profile 3 4 6 7 8. OK I-CSCF S-CSCF 5. REGISTER 2. REGISTER 9. OK P-CSCF 1. REGISTER 10. OK GGSN SGSN Radio Access Network

  13. Home HSS Location Profile I-CSCF Visited I-CSCF S-CSCF P-CSCF HSS GGSN Location Profile SGSN Radio Access Network Selectionof ServingNodeLocation(VisitedExecution) 3 4 5. REGISTER 12. OK 9 10 2. REGISTER 13. OK 11. OK 8. REGISTER 6 7 14. OK 1. REGISTER

  14. HSS S-CSCF I-CSCF Visited MGCF/ T-SGW I-CSCF Updates URI PSTN P-CSCF MGW GGSN HSS SGSN Radio Access Network Visited-DomainProvided Service(e.g. 411 DirectoryAssitance) 4 3 5. INVITE 14. 200 2. INVITE sip:info@visited 6. INVITE 13. 200 9. INVITE 10. IAM 15. 200 12. 200 11. ANM 7 8 16. 200 1. INVITE tel:1411

  15. GGSN SGSN Radio Access Network Non-Conversational Services Web Server IP Backbone Media Server

  16. Future Issues to be Decided • Handling of Instant Messages (SMS). SIP “MESSAGE” seems a natural fit, but other ideas are being proposed • Uses of MRF (Media Resource Function) node. Possible uses include: • Conference Bridge (both dial-in and spontaneous) • Transcoding • Streaming Media/Announcments

  17. Wireless Services Implications Caller Called Home Home Value added services Value added services API API SIP SIP (S-CSCF) (S-CSCF) Access signaling signaling Access WireLine WireLine WLan WLan TA? TA? TA? UTRAN GPRS GPRS UTRAN FW? FW? Bearer Services oriented Bearer Services oriented Bearer Services oriented IP backbone Video/Audio/Signaling Video/Audio/Signaling

  18. Conclusions • 3G is dedicated to using SIP for call control. • This development will allow a seamless integration of “smart” wireless terminals into the exploding information/communication IP networks. • If deployed correctly, the transition to 3G networks will be a revolution in wireless communications unlike any previously seen.

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