Probably some under him for most of the calls. But I wouldn't be too surprised if he'd make calls himself for big things, like for example securing marketing deals / buying off temporary exclusivity for shit like GTA 6 or so. It all depends on how the companies are structured. If Phil has other people doing other things for him so he can focus on deal-making, then that's what he does. If Ryan lets other do the deal-making (and he probably should, since every time Ryan opens his mouth, some stupid shit comes out; the guy needs PR training) then he can focus on something else.
I dunno why people make such a fucking drama out of this as if this is something new or extraordinary. It isn't.