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Content for TS 23.153 Word version: 18.0.0

1… 5… 5.5… 5.7… 6… 6.4… 6.11… 7… 9… A…

6.1 Mobile to Mobile TrFO Call Establishment 6.2 SRNS Relocation during TrFO 6.3 IN and Call Forward SS
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6 Detailed Call Procedures p. 38

6.1 Mobile to Mobile TrFO Call Establishment p. 38

6.2 SRNS Relocation during TrFO p. 41

6.2.1 Intra-MSC SRNS Relocation |R5| p. 42

6.2.2 Inter-MSC SRNS Relocation |R5| p. 46

6.2.3 Codec Modification/ Mid-Call Codec Negotiation after Inter-MSC Relocation |R5| p. 51

6.2.3.1 Codec Modification Initiated by the Far End Side p. 51

6.2.3.2 Mid-Call Codec Negotiation Initiated by the Far End Side p. 55

6.2.3.3 Modification Procedure after Codec Change in the Serving MSC p. 58

6.3 IN and Call Forward SS p. 58

6.3.1 TrFO interworking with SS (VMSC = service interworking node) p. 59

6.3.2 IN interworking (VMSC ≠ service interworking node) p. 61