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Reference Architecture of R00

Learn about the reference architecture of R00 support for roaming subscribers accessing IM subsystem services via the service platform in the home network and the visited network. Understand the roles of different CSCFs and the flow of call control, authentication, registration, and session interaction.

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Reference Architecture of R00

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  1. Reference Architecture of R00

  2. Support of Roaming Subscribers • via the service platform in the Home Network • via an external service platform

  3. UE Accessing IM Subsystem Services • In the visited network

  4. Public and Private Identities • One or more private user identities • IMSI within a NAI • is not used for routing of SIP messages • One or more public user identities

  5. Relationship of Private and Public User Identities

  6. Roles of CSCF • Call State Control Function • SIP proxy servers • Proxy CSCF • The first contact point within the IM subsystem • Forward the SIP register requests from the UE to an I-CSCF • Forward the SIP messages from the UE to the S-CSCF • CDR • Authorisation of bearer resources and QoS management. For details see TS 23.207

  7. Interrogating CSCF • The contact point within an operator’s network • Assign an S-CSCF to a user performing SIP Reg • Route a SIP request received from another network towards the S‑CSCF • Obtain from HSS the address of the S-CSCF • Forward the SIP request or response to the S‑CSCF determined by the step above • CDR

  8. Serving CSCF • A registrar • Session control for the registered endpoint's sessions. • Interaction with Services Platforms • On behalf of an originating endpoint • On behalf of an destination endpoint • CDR • Authenticate the UEs

  9. Registration Information Flow

  10. Re-Registration

  11. De-registration

  12. Call flow

  13. 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

  14. PSTN origination procedure

  15. PSTN origination procedure

  16. PSTN termination procedure

  17. PSTN termination procedure

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