This presents a unique problem for a name-based messenger. We saw this problem as an opportunity to expand what an alias can do. We called that feature Roles.
The simple additive of an alias/role became an opportunity to facilitate a shift system for providers. The tags used to organize those roles then became an opportunity for each client to customize the system. This allowed clinics of varying sizes to configure their schedule, messaging, and organizational structure to suit their needs in order to apply structure to their communication.