For the Trial and Perm Phases, patients with primary coaches are reassigned to the TSS, and the TSS handles all the Follow-Up calls.
However, for regions with TSS Anniversary-only support, there is no primary coach reassignment for Anniversary Calls. The Anniversary Call is automatically set up and assigned to the TSS, and since the primary coach is not reassigned, if the patient returns the call, the call will still be routed to the primary coach.