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Dialplan functions are somewhat similar to dialplan applications, but instead of doing work on a particular channel or call, they simply retrieve or set a particular setting on a channel, or perform text manipulation. For example, a dialplan function might retrieve the Caller ID information from an incoming call, filter some text, or set a timeout for caller input.

For more information on dialplan functions, see PBX Features.

All dialplan function modules have file names that looks like, such as, however applications and functions can also be provided by the core and other modules. Modules like res_musiconhold and res_xmpp provide applications related to their own functionality.

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