In a conference call, a user typically dials an extension from their phone and enters into a conference room. As more people call the extension they are added to the conference room. Users that are in the same conference room can communicate with each other.

There are two conferencing applications that are used with Asterisk, ConfBridge() and MeetMe(). In the early versions of Asterisk, MeetMe() was the primary application. Although the ConfBridge() application is not a direct replacement, it has become the standard application for conferencing in the newer versions of Asterisk.

There are two files that we will look at modifying to setup a conference call, confbridge.conf and extensions.conf. In the confbridge.conf file we will setup options for users, the conference bridge, and a user menu while in the conference call. In the extensions.conf file we will create a new extension that will setup the conference call.