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Domain Transfer in IMS-CS Interworking: Enabling Seamless Communication

This document discusses domain transfer processes and interactions between IMS and CS domains, focusing on selection policies, transfer restrictions, registration status, routing, and communication strategies. Abbreviations and detailed steps are provided for clarity.

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Domain Transfer in IMS-CS Interworking: Enabling Seamless Communication

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  1. 3GPP TSG-SA3-LI Meeting #23 Tdoc [H1]SA3LI06_109 Vienna (Austria), 17-19 October 2006 by SIEMENS Huber Klaus AAA PDG xGSN LEMF HI1 ADMF DF2/MF2 HI2 DF3/MF3 HI3

  2. VCC UE • Stores: domain selection policies, domain transfer restrictions • Selects:domain • Initates: Domain Transfer

  3. Domain Selection Function DSF • Determines: the IMS / CS registration status • Communicates: with the DTF • Determines: the CS Domain Routing Number

  4. CS Adaption Function • Identifies: the VCC user • Communicates:call related data from CS to IMS • Managed: IMS Routing Number (IMRN) • Behaves: as a SIP UA

  5. CAMEL Service • Enforces: CS redirection policy • Communicates:call related data from CS to IMS • Re-Routes: CS calls to the IMS • Resolves: VCC Application PSI from VDN

  6. Domain Transfer Function DTF Domain Transfer: • Enablement: iFC execution envokes DTF • Execution: consists of3 steps

  7. 3pcc at DTF

  8. Access Leg Update toward the remote end

  9. Domain Transfer - CS domain to IMS

  10. Domain Transfer – IMS to CS domain

  11. Abbreviations • 3pcc Third party call control • CAP CAMEL Application Part • CSAF CS Adaptation Function • CSRN CS Domain Routing Number • DSF Domain Selection Function • DTF Domain Transfer Function • gsmSCF GSM Service Control Function • IMRN IP Multimedia Routing Number • ISC IP multimedia Subsystem Service Control Interface • MGCF Media Gateway Control Function • PSI Public Service Identity • VCC Voice Call Continuity • VDI VCC Domain Transfer URI • VDN VCC Domain Transfer Number

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