The added unified fault handling support for router and services is using ChannelFactory<T> were T is IOutputChannel to support generic one-way channel shapes. The same generic WCF channel shape is used for sending notification messages.
The messages sent over the IOutputChannel are created using Message CreateMessage(...) to keep things generic in the router and on the service end. The fault and notification messages on the consumer end are of course strongly typed.
Faults and notification messages are sent from service providers using a ThreadStart delegate to send messages on separate threads to avoid being blocked by ongoing processing. This code is in the RoutedResponseScope class.
The sample code also shows how to integration "unit" test async dual WCF request-response MEPs with static EventHandler<T> events using anonymous delegates and ManualResetEvent thread synchronization.
Download the router example code here. The code is provided 'as-is' with no warranties and confers no rights. This example requires Windows Process Activation Service (Vista/WinServer2008), MSMQ 4.0 and .NET 3.0 WCF Non-HTTP Activation to be installed.