F.1 Introduction
24.2373GPPIP Multimedia (IM) Core Network (CN) subsystem IP Multimedia Subsystem (IMS) service continuityRelease 17Stage 3TS
F.1.1 General
This annex describes the behaviour of
1) the network when determining and performing PS to CS SRVCC access transfer for various types of single and multi session scenarios, based on UE and network support of the following features:
– MSC server assisted mid-call feature;
– PS to CS SRVCC for calls in alerting phase; and
– PS to CS SRVCC for originating calls in pre-alerting phase.
2) the UE when determining and performing PS-CS dual radio access transfer for various types of single and multi session scenarios, based on UE and network support of the following features:
– MSC server assisted mid-call feature;
– PS to CS dual radio access transfer for calls in alerting phase and CS to PS dual radio access transfer for calls in alerting phase; and
– PS to CS dual radio access transfer for originating calls in pre-alerting and CS to PS dual radio access transfer for originating calls in pre-alerting phase.