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-\subsubsection{The Asterisk dialplan}
-
-The Asterisk dialplan is divided into contexts. A context is simply a group
-of extensions. For each "line" that should be able to be called, an extension
-must be added to a context. Then, you configure the calling "line" to have
-access to this context.
-
-If you change the dialplan, you can use the Asterisk CLI command
-"dialplan reload" to load the new dialplan without disrupting
-service in your PBX.
-
-Extensions are routed according to priority and may be based on any set
-of characters (a-z), digits, \#, and *. Please note that when matching a
-pattern, "N", "X", and "Z" are interpreted as classes of digits.
-
-For each extension, several actions may be listed and must be given a unique
-priority. When each action completes, the call continues at the next priority
-(except for some modules which use explicitly GOTO's).
-
-Extensions frequently have data they pass to the executing application
-(most frequently a string). You can see the available dialplan applications
-by entering the "core show applications" command in the CLI.
-
-In this version of Asterisk, dialplan functions are added. These can
-be used as arguments to any application. For a list of the installed
-functions in your Asterisk, use the "core show functions" command.
-
-\subsubsection{Example dialplan}
-
-The example dial plan, in the \path{configs/extensions.conf.sample} file
-is installed as extensions.conf if you run "make samples" after
-installation of Asterisk. This file includes many more instructions
-and examples than this file, so it's worthwhile to read it.
-
-\subsubsection{Special extensions}
-
-There are some extensions with important meanings:
-
-\begin{itemize}
- \item s
- \begin{itemize}
- \item What to do when an extension context is entered (unless
- overridden by the low level channel interface)
- This is used in macros, and some special cases.
- "s" is not a generic catch-all wildcard extension.
- \end{itemize}
- \item i
- \begin{itemize}
- \item What to do if an invalid extension is entered
- \end{itemize}
- \item h
- \begin{itemize}
- \item The hangup extension, executed at hangup
- \end{itemize}
- \item t
- \begin{itemize}
- \item What to do if nothing is entered in the requisite amount
- of time.
- \end{itemize}
- \item T
- \begin{itemize}
- \item This is the extension that is executed when the 'absolute'
- timeout is reached. See "core show function TIMEOUT" for more
- information on setting timeouts.
- \end{itemize}
- \item e
- \begin{itemize}
- \item This extension will substitute as a catchall for any of the
- 'i', 't', or 'T' extensions, if any of them do not exist and
- catching the error in a single routine is desired. The
- function EXCEPTION may be used to query the type of exception
- or the location where it occurred.
- \end{itemize}
-\end{itemize}
-
-And finally, the extension context "default" is used when either a) an
-extension context is deleted while an extension is in use, or b) a specific
-starting extension handler has not been defined (unless overridden by the
-low level channel interface).