Content for TS 23.091 Word version: 18.0.0
4 Explicit Call Transfer (ECT)
4.1 Functions
4.2 SDL diagrams and information flows
4.3 Interaction with other supplementary services
4.4 Information stored in the HLR
4.5 State transition model
4.6 Transfer of information from the HLR to the VLR
4.7 Information stored in the VLR
4.8 Handover
$ Change history
4 Explicit Call Transfer (ECT) p. 6
4.1 Functions p. 6
4.2 SDL diagrams and information flows p. 8
4.2.1 General description p. 8
4.2.2 ECT (both calls answered) p. 8
4.2.3 ECT (one call answered, the other alerting) p. 11
4.3 Interaction with other supplementary services p. 14
4.3.1 Line Identification services p. 14
4.3.2 Call Forwarding Unconditional (CFU) p. 16
4.3.3 Call Forwarding on mobile subscriber Busy (CFB) p. 17
4.3.3.1 Call Forwarding on mobile subscriber Busy due to Network Determined User Busy (NDUB) p. 17
4.3.3.2 Call Forwarding on mobile subscriber Busy due to User Determined User Busy (UDUB) p. 17
4.3.4 Call Forwarding on No Reply (CFNRy) p. 18
4.3.5 Call Forwarding on mobile subscriber Not Reachable (CFNRc) p. 18
4.3.6 Call Waiting (CW) p. 18
4.3.7 Call Hold (HOLD) p. 18
4.3.8 Multi Party (MPTY) p. 18
4.3.9 Closed User Group (CUG) p. 18
4.3.10 Advice of Charge (AoC) services p. 19
4.3.11 Call Barring services p. 19
4.3.12 Explicit Call Transfer (ECT) p. 19
4.4 Information stored in the HLR p. 19
4.5 State transition model p. 19
4.6 Transfer of information from the HLR to the VLR p. 20
4.7 Information stored in the VLR p. 20
4.8 Handover p. 20
$ Change history p. 21
