reliableSession enabled=“true” in Service or client site?

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WCFServices

I have created service which uses nettcpip binding.I want check session id of client and server.According to my knowledge by default reliable sessions are not enabled.That's why I am getting different value.I want to enable reliable sessions so I can get same session id for client and server.In which config file I have to do that setting, service or client? I tried on server side and unable to set it on client side.I am getting different sessionid.Even I tried Wshttpbinding.In Wshttpbinding,bedefault reliablesession are enable.Still getting different id.Can anybody explain me why?

<bindings>
  <netTcpBinding>
    <binding name="netTCP" receiveTimeout="00:00:10">
      <reliableSession enabled="true"/>
    </binding>
  </netTcpBinding>
</bindings>