Server side Message Inspector

ConsoleOutputBehavior.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.ServiceModel.Description;

namespace WcfService123
{
    public class ConsoleOutputBehavior : IEndpointBehavior
    {
        #region IEndpointBehavior Members

        public void AddBindingParameters(ServiceEndpoint endpoint, System.ServiceModel.Channels.BindingParameterCollection bindingParameters)
        {
        }

        public void ApplyClientBehavior(ServiceEndpoint endpoint, System.ServiceModel.Dispatcher.ClientRuntime clientRuntime)
        {            
            throw new Exception("Behavior not supported on the consumer side!");
        }

        public void ApplyDispatchBehavior(ServiceEndpoint endpoint, System.ServiceModel.Dispatcher.EndpointDispatcher endpointDispatcher)
        {
            ConsoleOutputMessageInspector inspector = new ConsoleOutputMessageInspector();
            endpointDispatcher.DispatchRuntime.MessageInspectors.Add(inspector);
        }

        public void Validate(ServiceEndpoint endpoint)
        {
        }

        #endregion
    }
}

ConsoleOutputBehaviorExtensionElement.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.ServiceModel.Configuration;

namespace WcfService123
{
    public class ConsoleOutputBehaviorExtensionElement : BehaviorExtensionElement
    {
        public ConsoleOutputBehaviorExtensionElement()
        {
        }

        public override Type BehaviorType
        {
            get
            {
                return typeof(ConsoleOutputBehavior);
            }
        }

        protected override object CreateBehavior()
        {
            return new ConsoleOutputBehavior();
        }
    }
}

ConsoleOutputMessageInspector.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.ServiceModel.Dispatcher;
using System.ServiceModel.Channels;

namespace WcfService123
{
    public class ConsoleOutputMessageInspector : IDispatchMessageInspector
    {
        public object AfterReceiveRequest(ref System.ServiceModel.Channels.Message request, System.ServiceModel.IClientChannel channel, System.ServiceModel.InstanceContext instanceContext)
        {
            MessageBuffer buffer = request.CreateBufferedCopy(Int32.MaxValue);
            request = buffer.CreateMessage();

            Console.WriteLine("Received:\n{0}", buffer.CreateMessage().ToString());

            return null;
        }

        public void BeforeSendReply(ref System.ServiceModel.Channels.Message reply, object correlationState)
        {
            MessageBuffer buffer = reply.CreateBufferedCopy(Int32.MaxValue);
            reply = buffer.CreateMessage();

            Console.WriteLine("Sending:\n{0}", buffer.CreateMessage().ToString());
        }
    }
}

web.config

<system.serviceModel>
    <services>
      <service name="WcfService123.Service1" behaviorConfiguration="WcfService123.Service1Behavior">
        <host>
          <baseAddresses>
            <add baseAddress="http://localhost/WcfService123/Service1.svc"/>
          </baseAddresses>
        </host>
        <!-- Service Endpoints -->
        <endpoint address="" binding="basicHttpBinding" contract="WcfService123.IService1" behaviorConfiguration="subhasisBehavior">
          <!-- 
              Upon deployment, the following identity element should be removed or replaced to reflect the 
              identity under which the deployed service runs.  If removed, WCF will infer an appropriate identity 
              automatically.
          -->
          <identity>
            <dns value="localhost"/>
          </identity>
        </endpoint>
        <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>
      </service>
    </services>
    <extensions>
      <behaviorExtensions>
        <add name="ConsoleOutputBehavior" type="WcfService123.ConsoleOutputBehaviorExtensionElement, WcfService123, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
      </behaviorExtensions>
    </extensions>
    <behaviors>
      <serviceBehaviors>
        <behavior name="WcfService123.Service1Behavior">
          <!-- To avoid disclosing metadata information, set the value below to false and remove the metadata endpoint above before deployment -->
          <serviceMetadata httpGetEnabled="true"/>
          <!-- To receive exception details in faults for debugging purposes, set the value below to true.  Set to false before deployment to avoid disclosing exception information -->
          <serviceDebug includeExceptionDetailInFaults="false"/>          
        </behavior>
      </serviceBehaviors>
      <endpointBehaviors>
        <behavior name="subhasisBehavior">
          <ConsoleOutputBehavior />
        </behavior>
      </endpointBehaviors>
    </behaviors>
  </system.serviceModel>