Conference calling is an important aspect of most businesses. This chapter will help you build a great conference calling app that you can use. It will build a full-fledged conference calling app with multiple conference rooms that people can call.

This chapter will involve some SQL. You can find it in the sql.sql file in the Chapter4/ folder. We're keeping the conference database simple; when we schedule a conference, we enter the names and phone numbers of the participants.

The participants will get a text message with a phone number to call and a room number to enter an hour before the conference begins. This gives everyone time to get situated. We'll also let participants enter a room number and join a conference from their web browsers.

We're also going to build three interesting interfaces: the first lets a person participate in a conference from the web; the second mutes a participant so that they can monitor what's happening but not participate; and the third will give...