# cnfjoin overview

cnfjoin demonstrates adding callers to a conference. cnfjoin opens a set of available conferencing resources and a designated number of channels for call control. When cnfjoin receives a call, it adds the caller to a conference. All callers are added to the same conference. When a caller disconnects, the program removes the caller from the conference, allowing another caller to take its place.

cnfjoin features NaturalConference functions, Voice Message (VCE) service functions, and Natural Call Control (NCC) service functions. cnfjoin can be used with ISDN, CAS, or analog protocols.

## System requirements

cnfjoin can be used on AG boards and CG boards. To use cnfjoin, call control and all conferencing resources must reside on the same board. If you are using the default configuration files provided by the installation, your system is properly configured to use cnfjoin.