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

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

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

4. 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. 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. 6 Domain Transfer Function DTF Domain Transfer: Enablement: iFC execution envokes DTF Execution: consists of 3 steps

7. 7 3pcc at DTF

8. 8 Access Leg Update toward the remote end

9. 9 Domain Transfer - CS domain to IMS

10. 10 Domain Transfer – IMS to CS domain

11. 11 Abbreviations 3pccThird party call control CAPCAMEL Application Part CSAFCS Adaptation Function CSRNCS Domain Routing Number DSFDomain Selection Function DTFDomain Transfer Function gsmSCFGSM Service Control Function IMRNIP Multimedia Routing Number ISCIP multimedia Subsystem Service Control Interface MGCFMedia Gateway Control Function PSIPublic Service Identity VCCVoice Call Continuity VDIVCC Domain Transfer URI VDNVCC Domain Transfer Number