Section: 5.2.4.2a Call activation for vSRVCC
Content: If the MS supports vSRVCC, the MS has a voice media stream and a video media stream of a single session previously in S1 mode carried over the PS domain that are handed over to the CS domain via vSRVCC, the session associated with these media streams is in the "confirmed" state (defined in IETF RFC 3261 [137]), and the call control entity in "null" state receives indication "MM connection establishment due to vSRVCC handover", then the call control entity of the MS shall enter the "active" state, set the auxiliary state (defined in 3GPP TS 24.083[ Call Waiting (CW) and Call Hold (HOLD) supplementary services; Stage 3 ]  [27]) to "idle", set the multi party auxiliary state (defined in 3GPP TS 24.084[ Multi Party (MPTY) supplementary service; Stage 3 ]  [28]) to "idle" and indicate the call establishment is due to vSRVCC handover to the upper layers. The MS and the network shall locally set the TI value of the call to "000" and the TI flag value as in mobile terminated call. If the MS supports single radio PS to CS access transfer for calls in alerting state as specified in 3GPP TS 24.237[ IP Multimedia (IM) Core Network (CN) subsystem IP Multimedia Subsystem (IMS) service continuity; Stage 3 ]  [136] subclause 12.2.3B, and the MS has a single voice media stream and a single video media stream carried over the PS domain that is handed over to the CS domain via vSRVCC, and the call control entity of the MS in the "null" state receives indication "MM connection establishment due to vSRVCC handover" then: - the call control entity shall indicate to the upper layers that call establishment is due to vSRVCC handover; - if the upper layers indicate that the media stream(s) is/are associated with a mobile originated session in the "early" state (defined in IETF RFC 3261 [137]) according to the conditions specified in 3GPP TS 24.237[ IP Multimedia (IM) Core Network (CN) subsystem IP Multimedia Subsystem (IMS) service continuity; Stage 3 ]  [136] subclause 12.2.3B.3.2, the call control entity of the MS shall enter the "call delivered" state for this transaction. The MS and the network shall locally set the TI value of the call to "000" and the TI flag value as in mobile terminated call; and - if the upper layers indicate that the media stream(s) is/are associated with a mobile terminating session in the "early" state (defined in IETF RFC 3261 [137]) according to the conditions specified in 3GPP TS 24.237[ IP Multimedia (IM) Core Network (CN) subsystem IP Multimedia Subsystem (IMS) service continuity; Stage 3 ]  [136] subclause 12.2.3B.3.1, the call control entity of the MS shall enter the "call received" state for this transaction. The MS and the network shall locally set the TI value of the call to "000" and the TI flag value as in mobile terminated call. If the MS supports single radio PS to CS SRVCC for originating calls in pre-alerting phase as specified in 3GPP TS 24.237[ IP Multimedia (IM) Core Network (CN) subsystem IP Multimedia Subsystem (IMS) service continuity; Stage 3 ]  [136] subclause 12.2.3B, and the MS has a single voice media stream and a single video media stream carried over the PS domain that is handed over to the CS domain via vSRVCC, and the call control entity of the MS in the "null" state receives indication "MM connection establishment due to vSRVCC handover" then: - the call control entity shall indicate to the upper layers that call establishment is due to vSRVCC handover; and - if the upper layers indicate that the media stream(s) is/are associated with a mobile originated session in the "early" state (defined in IETF RFC 3261 [137]) according to the conditions specified in 3GPP TS 24.237[ IP Multimedia (IM) Core Network (CN) subsystem IP Multimedia Subsystem (IMS) service continuity; Stage 3 ]  [136] subclause 12.2.3B.3.3, the call control entity of the MS shall enter the "mobile originating call proceeding" state for this transaction. The MS and the network shall locally set the TI value of the call to "000" and the TI flag value as in mobile terminated call. If the MS supports single radio PS to CS SRVCC for terminating calls in pre-alerting phase as specified in 3GPP TS 24.237[ IP Multimedia (IM) Core Network (CN) subsystem IP Multimedia Subsystem (IMS) service continuity; Stage 3 ]  [136] subclause 12.2.3B, and the MS has a single voice media stream and a single video media stream carried over the PS domain that is handed over to the CS domain via vSRVCC, and the call control entity of the MS in the "null" state receives indication "MM connection establishment due to vSRVCC handover" then: - the call control entity shall indicate to the upper layers that call establishment is due to vSRVCC handover; and - if the upper layers indicate that the media stream(s) is/are associated with a mobile originated session in the "early" state (defined in IETF RFC 3261 [137]) according to the conditions specified in 3GPP TS 24.237[ IP Multimedia (IM) Core Network (CN) subsystem IP Multimedia Subsystem (IMS) service continuity; Stage 3 ]  [136] subclause 12.2.3B.3.2, the call control entity of the MS shall enter the "call present" state for this transaction. The MS and the network shall locally set the TI value of the call to "000" and the TI flag value as in mobile terminated call. NOTE: As the MS is entering "call present" state, it must send a CALL CONFIRMED message to the network, even even the call context (including codecs) is already available at the MSC in order to enter "mobile terminating call confirmed" state. If the MS supports multicall, the MS shall locally set SI value to "1" and the MS shall assume that the network does not support multicall. The network shall also locally set SI value to "1".If the MS has a mobile originating session in the "early" state (as defined in IETF RFC 3261 [137]) and is providing an internally generated alerting indication to the user prior to the vSRVCC handover, then after transitioning from the PS domain, the MS shall continue to provide the internal alerting indication to the user. The alerting indication is stopped when the user connection is attached.