A sudden idea:

First generation „Mixed Reality Groupcall”:  MSC-S + GPRS + ITR + SMS + DIS + Xj3d

Second generation “Mixed Reality Groupcall”: 3GPP Mission Critical Services (MCData = MSRP/TCP) + BS Contact + BS Collaborate

Third generation “Mixed Reality Groupcall”: “Something with XMPP and/or WebRTC”

Anyway: do we have a use case yet? That’s the “conditio sine qua non”

Have a nice week

Yours Christoph