Every conference is assigned a conference ID number. That number can be used with other features (short codes, programmable buttons) in order to join that conference.
Ad-hoc conferences are automatically assigned a conference ID number when started. Each ad-hoc conference uses the first available ID from 100 upwards.
Meet-me conferences use pre-set conference IDs set as follows:
Personal meet-me conferences use a conference ID that matches the extension number of the conference owner and moderator.
System meet-me conferences use the conference ID specified when the conference settings are configured.