What is a Conference Participant ID?

Conference Participant IDs uniquely identify participants within conferences. They allow you to manage the participants using the Web Services API, for example to mute or eject them. People typically call into conferences, their calls are answered by your applications which, having interacted with them to discover which room they should join, place calls to connect them to that room. For a given person calling in, their Conference Participant ID is the Instance ID of the application which placed that call.