Polycom 501 with COnference button as 3rd from top

Experts,

I have 501 with 2 uppers key buttons configured as extension 200 and 3rd one as Conference 8200 so after pressing 3rd I am dialing 8200. This is perfect scenario however; if I call from outside 200 extension I pick up the call .... put the HOLD button ..... I see RESUME | NEW CALL | TANSFER| CONFRNC

So I would like to make new call by pressing NEW CALL and see on the phone screen TO: 8200 and I am calling conference room instead having clear display and ability to type whatever number (ext, or external)

macreg.cfg of 200 extension:

<reginfo>
    <reg
        reg.1.displayName="200ENSION"
        reg.1.address="200"
        reg.1.label="200"
        reg.1.auth.userId="200"
        reg.1.auth.password="password"
        reg.1.lineKeys="2"
        reg.1.server.1.address=""
        reg.1.server.1.expires=""
        reg.1.server.1.expires.lineSeize="30"
        reg.1.server.1.port="5060"
        reg.1.server.1.register="1"
        reg.1.server.1.retryMaxCount=""
        reg.1.server.1.retryTimeOut=""
        reg.1.server.1.transport="DNSnaptr"
        reg.1.server.2.transport="DNSnaptr"
        reg.1.thirdPartyName=""
        reg.1.type="private"
        reg.2.displayName="200ENSION"
        reg.2.address="200"
        reg.2.label="Conf"
        reg.2.type="private"
        reg.2.thirdPartyName=""
        reg.2.auth.userId="200" 
        reg.2.auth.password="password" 
        reg.2.server.1.address=""
        reg.2.server.1.transport="DNSnaptr"
        reg.2.server.2.transport="DNSnaptr"
        reg.2.server.1.expires=""
        reg.2.server.1.register=""
        reg.2.server.1.retryTimeOut=""
        reg.2.server.1.retryMaxCount=""
        reg.2.server.1.expires.lineSeize="30"
        reg.2.acd-login-logout="0"
        reg.2.acd-agent-available="0"
        reg.2.ringType="2"
        reg.2.lineKeys=""
        reg.2.callsPerLineKey="" 
      <call>
      <donotdisturb call.donotdisturb.perReg="0"/>
      <autoOffHook call.autoOffHook.1.enabled="0"
       call.autoOffHook.1.contact="" 
       call.autoOffHook.2.enabled="1" 
       call.autoOffHook.2.contact="8200"
       call.autoOffHook.3.enabled="0" 
       call.autoOffHook.3.contact="0" 
       call.autoOffHook.4.enabled="0" 
       call.autoOffHook.4.contact="" 
       call.autoOffHook.5.enabled="0"
       call.autoOffHook.5.contact="" 
       call.autoOffHook.6.enabled="0"
       call.autoOffHook.6.contact="" />
      <serverMissedCall 
       call.serverMissedCall.1.enabled="0" 
       call.serverMissedCall.2.enabled="0" 
       call.serverMissedCall.3.enabled="0"
       call.serverMissedCall.4.enabled="0" 
       call.serverMissedCall.5.enabled="0" 
       call.serverMissedCall.6.enabled="0"/>
    </call>    
    />
    <msg msg.bypassInstantMessage="1">
        <mwi msg.mwi.1.callBack="*97" msg.mwi.1.callBackMode="contact" msg.mwi.1.subscribe="224" msg.mwi.2.callBack="" msg.mwi.2.callBackMode="disabled" msg.mwi.2.subscribe="" msg.mwi.3.callBack="" msg.mwi.3.callBackMode="disabled" msg.mwi.3.subscribe="" msg.mwi.4.callBack="" msg.mwi.4.callBackMode="disabled" msg.mwi.4.subscribe="" msg.mwi.5.callBack="" msg.mwi.5.callBackMode="disabled" msg.mwi.5.subscribe="" msg.mwi.6.callBack="" msg.mwi.6.callBackMode="disabled" msg.mwi.6.subscribe=""></mwi>
    </msg>

How can I change that config to have CONFERENCE button and clear display after pressing NEW CALL? If I change call.autoOffHook.2.enabled="1" to call.autoOffHook.2.enabled="0" Conference buttons behavior as line.....

Thank You for advice