The following diagram illustrates the message flow and server connections of the different components. In this deployment, it is possible for Microsoft clients in domain #1 to federate with both Microsoft and Avaya Aura clients in domain #2. Similarly, it is possible for both Microsoft and Avaya Aura clients in domain #2 to federate with Microsoft clients in domain #1. If Avaya Aura clients are federated with Microsoft clients in domain #1, the messages tandem through the Microsoft system in domain #2.