A.2 IMS PS Voice preferred

23.2213GPPArchitectural requirementsRelease 17TS

A.2.1 EPS Attach

The following figure A.2.1-1illustrates the UE behaviour when performing non-combined EPS/IMSI attach, with the setting of: "prefer IMS PS Voice with CS Voice as secondary".

Figure A.2.1-1: UE behaviour for IMS PS Voice preferred with CS Voice as secondary, non combined EPS/IMSI attach

A.2.2 Combined EPS/IMSI attach

The following figure A.2.2-1 illustrates the UE behaviour when performing combined EPS/IMSI attach, with the setting of: "prefer IMS PS Voice with CS Voice as secondary".

Figure A.2.2-1: UE behaviour for IMS PS Voice preferred with CS Voice as secondary, combined EPS/IMSI attach