Moderated conference is helpful to implement a conference call which can be administered by a moderator, You can define the moderator so that the conference can start only when the moderator joins(startConferenceOnEnter="true") and the conference to end when the moderator hangs up(endConferenceOnExit="true")
For the moderator, XML should be as shown below.
<Conference startConferenceOnEnter="true" endConferenceOnExit="true">My Room</Conference>
For other participants, below XML should be used.
<Conference startConferenceOnEnter="false" waitSound="http://www.foo.com/waitmusic/">My Room</Conference>