1. A system comprising: at least one processor; and one or more computer-readable storage media including instructions stored thereon that, responsive to execution by the at least one processor, cause the system perform operations including: ascertaining an attribute of a communication session received as part of a notification that the communication session is initiated in a network; applying the attribute of the communication session to a network policy for the network to specify a parameter for the communication session; generating a configuration event that includes the parameter for the communication session; and communicating the configuration event to a client device that is connected to the network and that is participating in the communication session.