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Asterisk uses text-based configuration files. Almost all of them ( zaptel.conf is in /etc ) are found in /etc/asterisk
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Variables, pattern matching, and string chopping can be used to control call flows
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Contexts define related groups of extensions based on time of day, the identity of the caller, or the channel used to originate the call
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SIP and Zaptel channels are the most common, and best supported, types of channels supported by Asterisk
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There are dozens and dozens of dial-plan commands, some with very sophisticated syntax, that you can use in extensions.conf . These commands define the telephony experience of the system users
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The Asterisk CLI is used to monitor and maintain the system.
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Asterisk CLI commands can be issued with shell and Perl scripts by running the Asterisk program in client mode and passing the CLI commands with the -r -x options
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Asterisk can be integrated with other systems using AGI (Asterisk Gateway Interface) and the Asterisk Manager API