Is it possible to track all outgoing WCF call?

The first thing I would look at is to see if the counters available in your server's Performance Monitor can provide you with the kind of feedback you need. There's built in counters for a variety of metrics for ServiceModel Endpoints, Operations and Services. Here is some more info http://msdn.microsoft.com/en-us/library/ms735098.aspx.

You could try building an implementation of IClientMessageInspector, which has a method to be called before the request is sent and when the reply is received. You can inspect the message, make logs etc in these methods.

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