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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 func_xxxxx.so, such as func_callerid.so, 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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