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Current and Enhanced Call Routing Procedures in Networks A and B

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This document outlines the existing and enhanced call routing procedures between Network A and Network B, including the interaction with various Mobile Switching Centers (MSCs) and Virtual Mobile Switching Centers (VMS). It details the information flow during call setup, alerting, and the handling of busy conditions and no-answer scenarios, featuring comprehensive diagrams to illustrate the processes. Additionally, it examines dynamic call forwarding setups and interactions with call forwarding handling systems (CFB and CFNA), providing clarity on routing procedures for effective communication.

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Current and Enhanced Call Routing Procedures in Networks A and B

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  1. Network A Network B MSC2 call setup (TLDN) MS_B MSC3 call setup MSC1 MS_A Fig.1 Current Routing Procedure

  2. Network A Network B MS_A MS_B MSC1 MSC2 VLR2 MSC3 HLR_B origination call setup LOCREQ ROUTREQ ROUTREQ routreq (TLDN) routreq (TLDN) locreq (TLDN) call setup (TLDN) alerting Fig.2 Information Flow of Current Routing Procedure

  3. Network A Network B MSC2 MS_B MSC3 call setup (TLDN) MSC1 MS_A Fig.3 Enhanced Routing Procedure

  4. Network A Network B MS_A MS_B MSC1 MSC2 VLR2 MSC3 HLR_B origination LOCREQ ROUTREQ ROUTREQ routreq (TLDN) routreq (TLDN) locreq (TLDN) call setup (TLDN) alerting Fig.4 Information Flow of Enhanced Routing Procedure

  5. MSC2 MSC3 MSC1 MS_A Network C Network A Network B MS_B (busy) call forward setup Fig.5 Interaction with CFB

  6. Network A Network B Network C MS_A MSC1 MSC2 VLR2 MSC3 HLR_B origination LOCREQ ROUTREQ ROUTREQ routreq (ACCDEN = busy) routreq (ACCDEN = busy) locreq (TERMLIST) call forward setup Fig.6 Information Flow of Interaction with CFB

  7. MSC2 MSC3 MSC1 MS_A Network C Network A Network B MS_B (no answer) call setup (TLDN) call release call forward setup Fig.7 Interaction with CFNA

  8. Network A Network B Network C MS_B MS_A MSC1 MSC2 VLR2 MSC3 HLR_B origination LOCREQ ROUTREQ ROUTREQ routreq (TLDN) routreq (TLDN) locreq (TLDN) call setup (TLDN) alerting timeout REDREQ TRANUMREQ tranumreq (TERMLIST) redreq call release call forward setup Fig.8 Information Flow of Interaction with CFNA

  9. MSC2 MSC4 MSC1 MS_A Network A Network B VMS MS_B (busy) call setup call setup Fig.9 Interaction with CFB to VMS - Case1 -

  10. Network A Network B MS_A MSC1 MSC2 VLR2 HLR_B VLR4 MSC4 VMS origination LOCREQ ROUTREQ ROUTREQ routreq (ACCDEN = busy) routreq (ACCDEN = busy) ROUTREQ ROUTREQ routreq (TLDN) routreq (TLDN) locreq (TLDN) call setup call setup Fig.10 Information Flow of Interaction with CFB to VMS - Case1 -

  11. MSC2 MSC4 MSC1 MS_A Network A Network B VMS MS_B (busy) call setup Fig.11 Interaction with CFB to VMS - Case2 -

  12. Network A Network B MS_A MSC1 MSC2 VLR2 HLR_B VMS origination LOCREQ ROUTREQ ROUTREQ routreq (ACCDEN = busy) routreq (ACCDEN = busy) locreq (DESTDGT) call setup Fig.12 Information Flow of CFB to VMS - Case2 -

  13. MSC2 MSC4 MSC1 MS_A Network A Network B VMS MS_B (no answer) call setup (TLDN) call release call setup call setup Fig.13 Interaction with CFNA to VMS - Case1 -

  14. Network A Network B MS_B MS_A MSC1 MSC2 VLR2 HLR_B VLR4 MSC4 VMS origination LOCREQ ROUTREQ ROUTREQ routreq (TLDN) routreq (TLDN) locreq (TLDN) call setup (TLDN) alerting timeout REDREQ TRANUMREQ ROUTREQ ROUTREQ routreq (TLDN) routreq (TLDN) tranumreq (TLDN) redreq call release call setup call setup Fig.14 Information Flow of Interaction with CFNA to VMS - Case1 -

  15. MSC2 MSC1 MS_A Network A Network B VMS MS_B (no answer) call setup (TLDN) call release call setup Fig.15 Interaction with CFNA to VMS - Case2 -

  16. Network A Network B MS_B MS_A MSC1 MSC2 VLR2 HLR_B VMS origination LOCREQ ROUTREQ ROUTREQ routreq (TLDN) routreq (TLDN) locreq (TLDN) call setup (TLDN) alerting timeout REDREQ TRANUMREQ tranumreq (DESTDGT) redreq call release call setup Fig.16 Information Flow of Interaction with CFNA to VMS - Case2 -

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