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Asterisk: The Future of Telephony by Leif Madsen, Jared Smith, Jim Van Meggelen

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indication

The loadzone option in a channel configuration file configures the tone zone to use for a channel. A tone zone is a set of indications, as configured in indications.conf , that contains information about all the various sounds that are common to telephones in a particular country—dial tone, ringing cycles, busy tones, and so on. A loaded tone zone is applied to a Zaptel channel, which will behave according to the definition for its tone zone. The idea is to deliver familiar telephone sounds, wherever in the world the users might be. Individual channels can have different indication sets configured, which means that a single Asterisk system can provide familiar telephony behavior to people from different countries. The defaultzone is used if nothing is specified for the channel.

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