Very slow business transaction not giving the reasons of slowness

Hi Experts,

We are trying to really get some value out of appdynamics , we have one business transaction on a Tier which is a WCF call to another service. When we see the call graph we find that .NET method (show below) is taking more time but it doesnt show what is causing it to be slow. May be we need to know in terms of the code.

System.ServiceModel.Dispatcher.RequestChannelBinder:Request (method time = 45346 ms, total time = 45346 ms)
 

Our developers need to know where this slowness is coming from??

Any help is highly appreciated.