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 countrydial 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.