It looks like you would need to go to the Arkadin website and do the following:
Audio Conference Settings
As the moderator, you can also manage the settings of all your conference calls by logging into your account and modifying the "Conference Settings"
Go to the "My Meetings" tab and click on the "Conference Settings" link.
You will be able to enable or disable the following features:
- Announce how many participants are in the conference upon your arrival
- Roll-call
- Allow (audio) recording of your conferences
- Automatically record the audio of your conferences when you start
- Hear a 'beep' upon the entry of a new participant
- Allow audio prompt to repeat your PIN Code once entered