reality is way more messy and worse. There are multiple actors involved in each part. Eg 2-3 "actors" for visual screen are ready for each call, 2-4 "audio" knowledge only experts on the call, 1 dedicated speaker, 1 person coordinating answers from audio folks to actor folks.
they are even ready for once in a while visit to offices in us, so they have actors there on the field as well ready to attend calls (probably 1 to 1 mapping after first visit)
and the work assigned is assigned to a completely different set of people, not involved in any of above. those folks and these folks dont interact.
i have worked part time as one of the "audio" person in above interviews. also involved on work side. ama.