This tutorial is based on Asterisk 1.6.2 and FreePBX 2.8
One of the most useful FreePBX modules is the Asterisk Info module. This is a web front-end that runs some Asterisk information commands in the background, providing information about what SIP extensions are connected, what trunks are registered and what calls are in progress, along with the codec they are using.
The Asterisk Info module should be located under the right hand “Tools” menu. If it is not there you may need to install it using the “Module Admin” menu.
Once you run Asterisk Info there will be another menu on the right hand side of the screen. Selecting Full Report will show all of the information available –