WCF service interface exchange

I want to avoid the duplex Chanel in WCF and create callback service on client,开发者_StackOverflow社区 pass the client address to server so the server can call the client any time. (maybe different binding etc.)

How can I pass the callback interface to the client? (I still want the server to manage this interface and to avoid put it in seperate DLL. Any Ideas? Thanks

Such interface can be passed only in shared assembly.