It's been a while since I ever asked for some help

I guess I'm getting too old but can someone please explain to me how a user in OXE (R12.4) with 4645 VM can record a call on demand. I seem to remember with 4635, the button just appeared during a call but I'm not sure if that is the case with 4645 too.
Unfortunately I do not have access to a Lab so cannot test without trying on a customer site... that doesn't happen so much since pandemic as most clients prefer to allow remote access to 8770/OXE etc..