Reliability can be configured in the client config file by adding reliableSession under binding tag.

<system.serviceModel>

<services>

<service name = "MyService">

<endpoint

address = "net.tcp://localhost:8888/MyService" binding = "netTcpBinding"

bindingConfiguration = "ReliableCommunication" contract = "IMyContract"

/>

</service>

</services>

<bindings>

<netTcpBinding>

<binding name = "ReliableCommunication">

<reliableSession enabled = "true"/>

</binding>

</netTcpBinding>

</bindings>

</system.serviceModel>

Reliability is supported by following bindings only

NetTcpBinding

WSHttpBinding

WSFederationHttpBinding

WSDualHttpBinding