From VoIP.ms Wiki
The Conference feature allows several people to dial into your DID number to be bridged together in the same conversation.
Conference provides the host with a dashboard monitor that allows organizers to monitor and control different aspects of the conference call in real time. Press the “Start Recording” button to get a recording of your conference call that you can listen and download after for any purposes.
Start using the Conference feature by clicking the “Add Conference” button to create a conference entry. Once your conference entry is ready you can route your DID number to it from the Manage DIDs > Edit interface to start receiving calls into your conference.
Name: This is the unique name of your conference. (e.g. Sales Meeting) Description: This can be used as a note or description to easily identify your conference. Maximum Participants: Specifies the maximum amount of callers that can participate in this conference. Leave empty for no limit. Once the limit is reached, the conference will be locked until a person leaves. Admin-level users are exempt from this limit and will still be able to access to join a locked conference. Language: Language for system messages, such as “Invalid Option”.
Name: Description: PIN: Announce Join Leave Announce User Count Announce Only User