The base distribution includes several channel backends, as well as applications. However, the beauty of Asterisk is its ability to be extended using its APIs and dynamic module loader.
End users can even write their own applications that run on the system.
This release includes support for full duplex sound cards being used as channels, a powerful voice over IP implementation, and a full set of sample sounds and configurations so you can immediately try it out. If you've been frustrated with not knowing how to get started with Asterisk before, and you have a full duplex sound card, this release is probably for you. All rights reserved.