Practical Asterisk 1.4 and 1.6: From Beginner to Expert

14. Conferencing

Asterisk offers an excellent built-in conferencing system. Nevertheless, the same applies here as elsewhere when it comes to Asterisk: There is no perfect solution! You still need to build some functionality in a modular fashion. A good example is three-way calling. Asterisk does not include true three-way calling. To achieve it, you must take a regular conference and limit the number of participants to three.

14.1 Installation and the Timing Device

A default Asterisk installation such as the one we performed in the first chapter of this book isn’t able to handle conferencing. The problem is the lack of a timing device. To mix channel audio properly, Asterisk needs a stable and common clock source. For that clock source, there ...