There are many ways to initiate and create conference rooms.  The quickest way to initiate a conference room is to dial *3 while you are on a call.

To add more people to your conference room:
1. Press *3 to create a conference room for yourself and the current caller.
2. To add another caller to conference room, hang up on existing conference room and call someone else.  While on call with the other person press *3 again and you and the new caller will join the previous caller in conference room created earlier.
3. To add more people repeat step 2.  While you are adding callers to conference room the callers in the room will be able to talk.

Note: The conference room range of 3000 combined with the extension you’re using.  For example if you are using extension 400 the conference room that will be created when you dial *3 is 3400.