A.27 Leaving a conference / 5GS

A.26 Inviting user to Video conference by sending a REFER request to the conference focus / 5GS

A.25 Video Conference Creation / 5GS

A.24 UE putting a Video Call on hold or resume the call / 5GS

A.21 Activation and deactivation of Supplementary Services / 5GS

A.23 eCall Setup and MSD Update / 5GS

A.22 GAA XCAP authentication

A.18 Putting a MTSI speech call to hold or to resume the call from the SS / 5GS

A.20 Inviting user to conference by sending a REFER request to the conference focus / 5GS

A.19 MTSI conference creation / 5GS