# Asterisk Project : Dialplan Function Modules

Added by malcolmd , edited by mdavenport on Sep 23, 2010

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 application modules have file names that looks like func_xxxxx.so, such as func_callerid.so.