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In order to inform Asterisk of the new configurations, you will need to pass it a command that instructs it to reload the relevant configuration file. The Asterisk CLI is where you can pass various commands to a running Asterisk system.
The best way to see what is happening with your Asterisk system is through the Asterisk CLI. This interface provides various levels of output to let you know what is happening on your system, and offers a wealth of useful utilities to allow you to affect your running system. Begin by calling up the Asterisk CLI and reloading the configuration files for your channel modules: